Feat: Chat (#15686)

* wip

* wip

* wip

* wip

* wip

* wip

* Update types.ts

* Create 1742203321812-chat.js

* wip

* wip

* Update room.vue

* Update home.vue

* Update home.vue

* Update ja-JP.yml

* Update index.d.ts

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update CHANGELOG.md

* wip

* Update home.vue

* clean up

* Update misskey-js.api.md

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* lint fixes

* lint

* Update UserEntityService.ts

* search

* wip

* 🎨

* wip

* Update home.ownedRooms.vue

* wip

* Update CHANGELOG.md

* Update style.scss

* wip

* improve performance

* improve performance

* Update timeline.test.ts

38 files changed, 2133 insertions, 130 deletions

diff --git a/packages/frontend/src/boot/main-boot.ts b/packages/frontend/src/boot/main-boot.ts
index 134490e317..19371dff0e 100644
--- a/packages/frontend/src/boot/main-boot.ts
+++ b/packages/frontend/src/boot/main-boot.ts
@@ -502,31 +502,16 @@ export async function mainBoot() {
 			});
 		});
 
-		main.on('unreadMention', () => {
-			updateCurrentAccountPartial({ hasUnreadMentions: true });
-		});
-
-		main.on('readAllUnreadMentions', () => {
-			updateCurrentAccountPartial({ hasUnreadMentions: false });
-		});
-
-		main.on('unreadSpecifiedNote', () => {
-			updateCurrentAccountPartial({ hasUnreadSpecifiedNotes: true });
-		});
-
-		main.on('readAllUnreadSpecifiedNotes', () => {
-			updateCurrentAccountPartial({ hasUnreadSpecifiedNotes: false });
-		});
-
-		main.on('readAllAntennas', () => {
-			updateCurrentAccountPartial({ hasUnreadAntenna: false });
-		});
-
 		main.on('unreadAntenna', () => {
 			updateCurrentAccountPartial({ hasUnreadAntenna: true });
 			sound.playMisskeySfx('antenna');
 		});
 
+		main.on('newChatMessage', () => {
+			updateCurrentAccountPartial({ hasUnreadChatMessages: true });
+			sound.playMisskeySfx('chat');
+		});
+
 		main.on('readAllAnnouncements', () => {
 			updateCurrentAccountPartial({ hasUnreadAnnouncement: false });
 		});
diff --git a/packages/frontend/src/components/MkButton.vue b/packages/frontend/src/components/MkButton.vue
index 5e89dfba12..891af7f696 100644
--- a/packages/frontend/src/components/MkButton.vue
+++ b/packages/frontend/src/components/MkButton.vue
@@ -7,11 +7,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 <button
 	v-if="!link"
 	ref="el" class="_button"
-	:class="[$style.root, { [$style.inline]: inline, [$style.primary]: primary, [$style.gradate]: gradate, [$style.danger]: danger, [$style.rounded]: rounded, [$style.full]: full, [$style.small]: small, [$style.large]: large, [$style.transparent]: transparent, [$style.asLike]: asLike, [$style.iconOnly]: iconOnly }]"
+	:class="[$style.root, { [$style.inline]: inline, [$style.primary]: primary, [$style.gradate]: gradate, [$style.danger]: danger, [$style.rounded]: rounded, [$style.full]: full, [$style.small]: small, [$style.large]: large, [$style.transparent]: transparent, [$style.asLike]: asLike, [$style.iconOnly]: iconOnly, [$style.wait]: wait }]"
 	:type="type"
 	:name="name"
 	:value="value"
-	:disabled="disabled"
+	:disabled="disabled || wait"
 	@click="emit('click', $event)"
 	@mousedown="onMousedown"
 >
@@ -22,7 +22,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </button>
 <MkA
 	v-else class="_button"
-	:class="[$style.root, { [$style.inline]: inline, [$style.primary]: primary, [$style.gradate]: gradate, [$style.danger]: danger, [$style.rounded]: rounded, [$style.full]: full, [$style.small]: small, [$style.large]: large, [$style.transparent]: transparent, [$style.asLike]: asLike, [$style.iconOnly]: iconOnly }]"
+	:class="[$style.root, { [$style.inline]: inline, [$style.primary]: primary, [$style.gradate]: gradate, [$style.danger]: danger, [$style.rounded]: rounded, [$style.full]: full, [$style.small]: small, [$style.large]: large, [$style.transparent]: transparent, [$style.asLike]: asLike, [$style.iconOnly]: iconOnly, [$style.wait]: wait }]"
 	:to="to ?? '#'"
 	:behavior="linkBehavior"
 	@mousedown="onMousedown"
@@ -256,6 +256,10 @@ function onMousedown(evt: MouseEvent): void {
 		opacity: 0.5;
 	}
 
+	&.wait {
+		cursor: wait !important;
+	}
+
 	&:focus-visible {
 		outline-offset: 2px;
 	}
diff --git a/packages/frontend/src/components/MkDateSeparatedList.vue b/packages/frontend/src/components/MkDateSeparatedList.vue
index b5842876ac..ec6fcdc311 100644
--- a/packages/frontend/src/components/MkDateSeparatedList.vue
+++ b/packages/frontend/src/components/MkDateSeparatedList.vue
@@ -168,21 +168,17 @@ export default defineComponent({
 	container-type: inline-size;
 
 	&:global {
-	> .list-move {
-		transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
-	}
-
-	&.deny-move-transition > .list-move {
-		transition: none !important;
-	}
+		> .list-move {
+			transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
+		}
 
-	> .list-enter-active {
-		transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1), opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1);
-	}
+		> .list-enter-active {
+			transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1), opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1);
+		}
 
-	> *:empty {
-		display: none;
-	}
+		> *:empty {
+			display: none;
+		}
 	}
 
 	&:not(.date-separated-list-nogap) > *:not(:last-child) {
diff --git a/packages/frontend/src/components/MkFukidashi.vue b/packages/frontend/src/components/MkFukidashi.vue
index 8b1c56fca4..e9544afa35 100644
--- a/packages/frontend/src/components/MkFukidashi.vue
+++ b/packages/frontend/src/components/MkFukidashi.vue
@@ -10,6 +10,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		tail === 'left' ? $style.left : $style.right,
 		negativeMargin === true && $style.negativeMargin,
 		shadow === true && $style.shadow,
+		accented === true && $style.accented
 	]"
 >
 	<div :class="$style.bg">
@@ -30,10 +31,12 @@ withDefaults(defineProps<{
 	tail?: 'left' | 'right' | 'none';
 	negativeMargin?: boolean;
 	shadow?: boolean;
+	accented?: boolean;
 }>(), {
 	tail: 'right',
 	negativeMargin: false,
 	shadow: false,
+	accented: false,
 });
 </script>
 
@@ -47,6 +50,10 @@ withDefaults(defineProps<{
 	min-height: calc(var(--fukidashi-radius) * 2);
 	padding-top: calc(var(--fukidashi-radius) * .13);
 
+	&.accented {
+		--fukidashi-bg: var(--MI_THEME-accent);
+	}
+
 	&.shadow {
 		filter: drop-shadow(0 4px 32px var(--MI_THEME-shadow));
 	}
@@ -77,7 +84,7 @@ withDefaults(defineProps<{
 
 .content {
 	position: relative;
-	padding: 8px 12px;
+	padding: 10px 14px;
 }
 
 .tail {
diff --git a/packages/frontend/src/components/MkMediaList.vue b/packages/frontend/src/components/MkMediaList.vue
index ae15776041..4a1100c324 100644
--- a/packages/frontend/src/components/MkMediaList.vue
+++ b/packages/frontend/src/components/MkMediaList.vue
@@ -227,7 +227,6 @@ defineExpose({
 .container {
 	position: relative;
 	width: 100%;
-	margin-top: 4px;
 }
 
 .medias {
diff --git a/packages/frontend/src/components/MkMenu.vue b/packages/frontend/src/components/MkMenu.vue
index a84bd9b256..f2f36308ca 100644
--- a/packages/frontend/src/components/MkMenu.vue
+++ b/packages/frontend/src/components/MkMenu.vue
@@ -11,6 +11,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		[$style.center]: align === 'center',
 		[$style.big]: big,
 		[$style.asDrawer]: asDrawer,
+		[$style.widthSpecified]: width != null,
 	}"
 	@focusin.passive.stop="() => {}"
 >
@@ -29,15 +30,19 @@ SPDX-License-Identifier: AGPL-3.0-only
 	>
 		<template v-for="item in (items2 ?? [])">
 			<div v-if="item.type === 'divider'" role="separator" tabindex="-1" :class="$style.divider"></div>
+
 			<span v-else-if="item.type === 'label'" role="menuitem" tabindex="-1" :class="[$style.label, $style.item]">
 				<span style="opacity: 0.7;">{{ item.text }}</span>
 			</span>
+
 			<span v-else-if="item.type === 'pending'" role="menuitem" tabindex="0" :class="[$style.pending, $style.item]">
 				<span><MkEllipsis/></span>
 			</span>
+
 			<div v-else-if="item.type === 'component'" role="menuitem" tabindex="-1" :class="[$style.componentItem]">
 				<component :is="item.component" v-bind="item.props"/>
 			</div>
+
 			<MkA
 				v-else-if="item.type === 'link'"
 				role="menuitem"
@@ -51,10 +56,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<i v-if="item.icon" class="ti-fw" :class="[$style.icon, item.icon]"></i>
 				<MkAvatar v-if="item.avatar" :user="item.avatar" :class="$style.avatar"/>
 				<div :class="$style.item_content">
-					<span :class="$style.item_content_text">{{ item.text }}</span>
+					<div :class="$style.item_content_text">
+						<div :class="$style.item_content_text_title">{{ item.text }}</div>
+						<div v-if="item.caption" :class="$style.item_content_text_caption">{{ item.caption }}</div>
+					</div>
 					<span v-if="item.indicate" :class="$style.indicator" class="_blink"><i class="_indicatorCircle"></i></span>
 				</div>
 			</MkA>
+
 			<a
 				v-else-if="item.type === 'a'"
 				role="menuitem"
@@ -70,10 +79,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 			>
 				<i v-if="item.icon" class="ti-fw" :class="[$style.icon, item.icon]"></i>
 				<div :class="$style.item_content">
-					<span :class="$style.item_content_text">{{ item.text }}</span>
+					<div :class="$style.item_content_text">
+						<div :class="$style.item_content_text_title">{{ item.text }}</div>
+						<div v-if="item.caption" :class="$style.item_content_text_caption">{{ item.caption }}</div>
+					</div>
 					<span v-if="item.indicate" :class="$style.indicator" class="_blink"><i class="_indicatorCircle"></i></span>
 				</div>
 			</a>
+
 			<button
 				v-else-if="item.type === 'user'"
 				role="menuitem"
@@ -88,6 +101,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<span :class="$style.indicator" class="_blink"><i class="_indicatorCircle"></i></span>
 				</div>
 			</button>
+
 			<button
 				v-else-if="item.type === 'switch'"
 				role="menuitemcheckbox"
@@ -101,10 +115,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<i v-if="item.icon" class="ti-fw" :class="[$style.icon, item.icon]"></i>
 				<MkSwitchButton v-else :class="$style.switchButton" :checked="item.ref" :disabled="item.disabled" @toggle="switchItem(item)"/>
 				<div :class="$style.item_content">
-					<span :class="[$style.item_content_text, { [$style.switchText]: !item.icon }]">{{ item.text }}</span>
+					<div :class="[$style.item_content_text, { [$style.switchText]: !item.icon }]">
+						<div :class="$style.item_content_text_title">{{ item.text }}</div>
+						<div v-if="item.caption" :class="$style.item_content_text_caption">{{ item.caption }}</div>
+					</div>
 					<MkSwitchButton v-if="item.icon" :class="[$style.switchButton, $style.caret]" :checked="item.ref" :disabled="item.disabled" @toggle="switchItem(item)"/>
 				</div>
 			</button>
+
 			<button
 				v-else-if="item.type === 'radio'"
 				role="menuitem"
@@ -117,10 +135,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 			>
 				<i v-if="item.icon" class="ti-fw" :class="[$style.icon, item.icon]" style="pointer-events: none;"></i>
 				<div :class="$style.item_content">
-					<span :class="$style.item_content_text" style="pointer-events: none;">{{ item.text }}</span>
+					<div :class="$style.item_content_text" style="pointer-events: none;">
+						<div :class="$style.item_content_text_title">{{ item.text }}</div>
+						<div v-if="item.caption" :class="$style.item_content_text_caption">{{ item.caption }}</div>
+					</div>
 					<span :class="$style.caret" style="pointer-events: none;"><i class="ti ti-chevron-right ti-fw"></i></span>
 				</div>
 			</button>
+
 			<button
 				v-else-if="item.type === 'radioOption'"
 				role="menuitemradio"
@@ -134,9 +156,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<span :class="[$style.radioIcon, { [$style.radioChecked]: unref(item.active) }]"></span>
 				</div>
 				<div :class="$style.item_content">
-					<span :class="$style.item_content_text">{{ item.text }}</span>
+					<div :class="$style.item_content_text">
+						<div :class="$style.item_content_text_title">{{ item.text }}</div>
+						<div v-if="item.caption" :class="$style.item_content_text_caption">{{ item.caption }}</div>
+					</div>
 				</div>
 			</button>
+
 			<button
 				v-else-if="item.type === 'parent'"
 				role="menuitem"
@@ -148,12 +174,17 @@ SPDX-License-Identifier: AGPL-3.0-only
 			>
 				<i v-if="item.icon" class="ti-fw" :class="[$style.icon, item.icon]" style="pointer-events: none;"></i>
 				<div :class="$style.item_content">
-					<span :class="$style.item_content_text" style="pointer-events: none;">{{ item.text }}</span>
+					<div :class="$style.item_content_text" style="pointer-events: none;">
+						<div :class="$style.item_content_text_title">{{ item.text }}</div>
+						<div v-if="item.caption" :class="$style.item_content_text_caption">{{ item.caption }}</div>
+					</div>
 					<span :class="$style.caret" style="pointer-events: none;"><i class="ti ti-chevron-right ti-fw"></i></span>
 				</div>
 			</button>
+
 			<button
-				v-else role="menuitem"
+				v-else
+				role="menuitem"
 				tabindex="0"
 				:class="['_button', $style.item, { [$style.danger]: item.danger, [$style.active]: unref(item.active) }]"
 				@click.prevent="unref(item.active) ? close(false) : clicked(item.action, $event)"
@@ -163,11 +194,15 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<i v-if="item.icon" class="ti-fw" :class="[$style.icon, item.icon]"></i>
 				<MkAvatar v-if="item.avatar" :user="item.avatar" :class="$style.avatar"/>
 				<div :class="$style.item_content">
-					<span :class="$style.item_content_text">{{ item.text }}</span>
+					<div :class="$style.item_content_text">
+						<div :class="$style.item_content_text_title">{{ item.text }}</div>
+						<div v-if="item.caption" :class="$style.item_content_text_caption">{{ item.caption }}</div>
+					</div>
 					<span v-if="item.indicate" :class="$style.indicator" class="_blink"><i class="_indicatorCircle"></i></span>
 				</div>
 			</button>
 		</template>
+
 		<span v-if="items2 == null || items2.length === 0" tabindex="-1" :class="[$style.none, $style.item]">
 			<span>{{ i18n.ts.none }}</span>
 		</span>
@@ -438,6 +473,12 @@ onBeforeUnmount(() => {
 		}
 	}
 
+	&:not(.widthSpecified) {
+		> .menu {
+			max-width: 400px;
+		}
+	}
+
 	&.big:not(.asDrawer) {
 		> .menu {
 			min-width: 230px;
@@ -607,10 +648,19 @@ onBeforeUnmount(() => {
 
 .item_content_text {
 	max-width: calc(100vw - 4rem);
+}
+
+.item_content_text_title {
 	text-overflow: ellipsis;
 	overflow: hidden;
 }
 
+.item_content_text_caption {
+	text-wrap: auto;
+	font-size: 85%;
+	opacity: 0.7;
+}
+
 .switchButton {
 	margin-left: -2px;
 	--height: 1.35em;
diff --git a/packages/frontend/src/components/MkPagination.vue b/packages/frontend/src/components/MkPagination.vue
index ab8bda403b..a729619180 100644
--- a/packages/frontend/src/components/MkPagination.vue
+++ b/packages/frontend/src/components/MkPagination.vue
@@ -24,16 +24,16 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</slot>
 	</div>
 
-	<div v-else ref="rootEl">
-		<div v-show="pagination.reversed && more" key="_more_" class="_margin">
-			<MkButton v-if="!moreFetching" v-appear="(enableInfiniteScroll && !props.disableAutoLoad) ? appearFetchMoreAhead : null" :class="$style.more" :disabled="moreFetching" :style="{ cursor: moreFetching ? 'wait' : 'pointer' }" primary rounded @click="fetchMoreAhead">
+	<div v-else ref="rootEl" class="_gaps">
+		<div v-show="pagination.reversed && more" key="_more_">
+			<MkButton v-if="!moreFetching" v-appear="(enableInfiniteScroll && !props.disableAutoLoad) ? appearFetchMoreAhead : null" :class="$style.more" :wait="moreFetching" primary rounded @click="fetchMoreAhead">
 				{{ i18n.ts.loadMore }}
 			</MkButton>
 			<MkLoading v-else class="loading"/>
 		</div>
 		<slot :items="Array.from(items.values())" :fetching="fetching || moreFetching"></slot>
-		<div v-show="!pagination.reversed && more" key="_more_" class="_margin">
-			<MkButton v-if="!moreFetching" v-appear="(enableInfiniteScroll && !props.disableAutoLoad) ? appearFetchMore : null" :class="$style.more" :disabled="moreFetching" :style="{ cursor: moreFetching ? 'wait' : 'pointer' }" primary rounded @click="fetchMore">
+		<div v-show="!pagination.reversed && more" key="_more_">
+			<MkButton v-if="!moreFetching" v-appear="(enableInfiniteScroll && !props.disableAutoLoad) ? appearFetchMore : null" :class="$style.more" :wait="moreFetching" primary rounded @click="fetchMore">
 				{{ i18n.ts.loadMore }}
 			</MkButton>
 			<MkLoading v-else class="loading"/>
@@ -46,7 +46,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { computed, isRef, nextTick, onActivated, onBeforeMount, onBeforeUnmount, onDeactivated, ref, useTemplateRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
 import { useDocumentVisibility } from '@@/js/use-document-visibility.js';
-import { onScrollTop, isTopVisible, getBodyScrollHeight, getScrollContainer, onScrollBottom, scrollToBottom, scroll, isBottomVisible } from '@@/js/scroll.js';
+import { onScrollTop, isHeadVisible, getBodyScrollHeight, getScrollContainer, onScrollBottom, scrollToBottom, scroll, isTailVisible } from '@@/js/scroll.js';
 import type { ComputedRef } from 'vue';
 import type { MisskeyEntity } from '@/types/date-separated-list.js';
 import { misskeyApi } from '@/utility/misskey-api.js';
@@ -74,8 +74,6 @@ export type Paging<E extends keyof Misskey.Endpoints = keyof Misskey.Endpoints>
 	reversed?: boolean;
 
 	offsetMode?: boolean;
-
-	pageEl?: HTMLElement;
 };
 
 type MisskeyEntityMap = Map<string, MisskeyEntity>;
@@ -141,8 +139,7 @@ const {
 	enableInfiniteScroll,
 } = prefer.r;
 
-const contentEl = computed(() => props.pagination.pageEl ?? rootEl.value);
-const scrollableElement = computed(() => contentEl.value ? getScrollContainer(contentEl.value) : window.document.body);
+const scrollableElement = computed(() => rootEl.value ? getScrollContainer(rootEl.value) : window.document.body);
 
 const visibility = useDocumentVisibility();
 
@@ -173,13 +170,13 @@ watch(rootEl, () => {
 	});
 });
 
-watch([backed, contentEl], () => {
+watch([backed, rootEl], () => {
 	if (!backed.value) {
-		if (!contentEl.value) return;
+		if (!rootEl.value) return;
 
 		scrollRemove.value = props.pagination.reversed
-			? onScrollBottom(contentEl.value, executeQueue, TOLERANCE)
-			: onScrollTop(contentEl.value, (topVisible) => { if (topVisible) executeQueue(); }, TOLERANCE);
+			? onScrollBottom(rootEl.value, executeQueue, TOLERANCE)
+			: onScrollTop(rootEl.value, (topVisible) => { if (topVisible) executeQueue(); }, TOLERANCE);
 	} else {
 		if (scrollRemove.value) scrollRemove.value();
 		scrollRemove.value = null;
@@ -349,7 +346,7 @@ const appearFetchMoreAhead = async (): Promise<void> => {
 	fetchMoreAppearTimeout();
 };
 
-const isTop = (): boolean => isBackTop.value || (props.pagination.reversed ? isBottomVisible : isTopVisible)(contentEl.value!, TOLERANCE);
+const isHead = (): boolean => isBackTop.value || (props.pagination.reversed ? isTailVisible : isHeadVisible)(rootEl.value!, TOLERANCE);
 
 watch(visibility, () => {
 	if (visibility.value === 'hidden') {
@@ -364,7 +361,7 @@ watch(visibility, () => {
 			timerForSetPause = null;
 		} else {
 			isPausingUpdate = false;
-			if (isTop()) {
+			if (isHead()) {
 				executeQueue();
 			}
 		}
@@ -376,16 +373,18 @@ watch(visibility, () => {
  * ストリーミングから降ってきたアイテムはこれで追加する
  * @param item アイテム
  */
-const prepend = (item: MisskeyEntity): void => {
+function prepend(item: MisskeyEntity): void {
 	if (items.value.size === 0) {
 		items.value.set(item.id, item);
 		fetching.value = false;
 		return;
 	}
 
-	if (isTop() && !isPausingUpdate) unshiftItems([item]);
+	console.log(isHead(), isPausingUpdate);
+
+	if (isHead() && !isPausingUpdate) unshiftItems([item]);
 	else prependQueue(item);
-};
+}
 
 /**
  * 新着アイテムをitemsの先頭に追加し、displayLimitを適用する
@@ -447,7 +446,7 @@ onDeactivated(() => {
 });
 
 function toBottom() {
-	scrollToBottom(contentEl.value!);
+	scrollToBottom(rootEl.value!);
 }
 
 onBeforeMount(() => {
diff --git a/packages/frontend/src/components/MkPolkadots.vue b/packages/frontend/src/components/MkPolkadots.vue
new file mode 100644
index 0000000000..285c4d0b79
--- /dev/null
+++ b/packages/frontend/src/components/MkPolkadots.vue
@@ -0,0 +1,40 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="[$style.root, accented ? $style.accented : null]"></div>
+</template>
+
+<script lang="ts" setup>
+const props = withDefaults(defineProps<{
+	accented?: boolean;
+}>(), {
+	accented: false,
+});
+</script>
+
+<style lang="scss" module>
+.root {
+	--c: var(--MI_THEME-divider);
+
+	&.accented {
+		--c: var(--MI_THEME-accent);
+		opacity: 0.5;
+	}
+
+	--dot-size: 2px;
+	--gap-size: 40px;
+	--offset: calc(var(--gap-size) / 2);
+
+	height: 200px;
+	margin-bottom: -200px;
+
+	background-image: linear-gradient(transparent 60%, transparent 100%), radial-gradient(var(--c) var(--dot-size), transparent var(--dot-size)), radial-gradient(var(--c) var(--dot-size), transparent var(--dot-size));
+	background-position: 0 0, 0 0, var(--offset) var(--offset);
+	background-size: 100% 100%, var(--gap-size) var(--gap-size), var(--gap-size) var(--gap-size);
+	mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
+	pointer-events: none;
+}
+</style>
diff --git a/packages/frontend/src/components/MkUrlPreview.vue b/packages/frontend/src/components/MkUrlPreview.vue
index f20aee0ce3..20dab6f028 100644
--- a/packages/frontend/src/components/MkUrlPreview.vue
+++ b/packages/frontend/src/components/MkUrlPreview.vue
@@ -246,6 +246,7 @@ onUnmounted(() => {
 	box-shadow: 0 0 0 1px var(--MI_THEME-divider);
 	border-radius: 8px;
 	overflow: clip;
+	text-align: left;
 
 	&:hover {
 		text-decoration: none;
diff --git a/packages/frontend/src/local-storage.ts b/packages/frontend/src/local-storage.ts
index 099339fbee..f6d6bbf0fb 100644
--- a/packages/frontend/src/local-storage.ts
+++ b/packages/frontend/src/local-storage.ts
@@ -28,7 +28,7 @@ export type Keys = (
 	'theme' |
 	'themeId' |
 	'customCss' |
-	'message_drafts' |
+	'chatMessageDrafts' |
 	'scratchpad' |
 	'debug' |
 	'preferences' |
diff --git a/packages/frontend/src/navbar.ts b/packages/frontend/src/navbar.ts
index d478ece641..894df83721 100644
--- a/packages/frontend/src/navbar.ts
+++ b/packages/frontend/src/navbar.ts
@@ -4,6 +4,7 @@
  */
 
 import { computed, reactive } from 'vue';
+import { ui } from '@@/js/config.js';
 import { clearCache } from './utility/clear-cache.js';
 import { $i } from '@/i.js';
 import { miLocalStorage } from '@/local-storage.js';
@@ -11,7 +12,6 @@ import { openInstanceMenu, openToolsMenu } from '@/ui/_common_/common.js';
 import { lookup } from '@/utility/lookup.js';
 import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
-import { ui } from '@@/js/config.js';
 import { unisonReload } from '@/utility/unison-reload.js';
 
 export const navbarItemDef = reactive({
@@ -110,6 +110,12 @@ export const navbarItemDef = reactive({
 		icon: 'ti ti-device-tv',
 		to: '/channels',
 	},
+	chat: {
+		title: i18n.ts.chat,
+		icon: 'ti ti-message',
+		to: '/chat',
+		indicated: computed(() => $i != null && $i.hasUnreadChatMessages),
+	},
 	achievements: {
 		title: i18n.ts.achievements,
 		icon: 'ti ti-medal',
diff --git a/packages/frontend/src/pages/admin/roles.editor.vue b/packages/frontend/src/pages/admin/roles.editor.vue
index 4e9f4edb70..d1e823215a 100644
--- a/packages/frontend/src/pages/admin/roles.editor.vue
+++ b/packages/frontend/src/pages/admin/roles.editor.vue
@@ -160,6 +160,26 @@ SPDX-License-Identifier: AGPL-3.0-only
 				</div>
 			</MkFolder>
 
+			<MkFolder v-if="matchQuery([i18n.ts._role._options.canChat, 'canChat'])">
+				<template #label>{{ i18n.ts._role._options.canChat }}</template>
+				<template #suffix>
+					<span v-if="role.policies.canChat.useDefault" :class="$style.useDefaultLabel">{{ i18n.ts._role.useBaseValue }}</span>
+					<span v-else>{{ role.policies.canChat.value ? i18n.ts.yes : i18n.ts.no }}</span>
+					<span :class="$style.priorityIndicator"><i :class="getPriorityIcon(role.policies.canChat)"></i></span>
+				</template>
+				<div class="_gaps">
+					<MkSwitch v-model="role.policies.canChat.useDefault" :readonly="readonly">
+						<template #label>{{ i18n.ts._role.useBaseValue }}</template>
+					</MkSwitch>
+					<MkSwitch v-model="role.policies.canChat.value" :disabled="role.policies.canChat.useDefault" :readonly="readonly">
+						<template #label>{{ i18n.ts.enable }}</template>
+					</MkSwitch>
+					<MkRange v-model="role.policies.canChat.priority" :min="0" :max="2" :step="1" easing :textConverter="(v) => v === 0 ? i18n.ts._role._priority.low : v === 1 ? i18n.ts._role._priority.middle : v === 2 ? i18n.ts._role._priority.high : ''">
+						<template #label>{{ i18n.ts._role.priority }}</template>
+					</MkRange>
+				</div>
+			</MkFolder>
+
 			<MkFolder v-if="matchQuery([i18n.ts._role._options.mentionMax, 'mentionLimit'])">
 				<template #label>{{ i18n.ts._role._options.mentionMax }}</template>
 				<template #suffix>
diff --git a/packages/frontend/src/pages/admin/roles.vue b/packages/frontend/src/pages/admin/roles.vue
index 0428352350..df4efd1271 100644
--- a/packages/frontend/src/pages/admin/roles.vue
+++ b/packages/frontend/src/pages/admin/roles.vue
@@ -51,6 +51,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 							</MkSwitch>
 						</MkFolder>
 
+						<MkFolder v-if="matchQuery([i18n.ts._role._options.canChat, 'canChat'])">
+							<template #label>{{ i18n.ts._role._options.canChat }}</template>
+							<template #suffix>{{ policies.canChat ? i18n.ts.yes : i18n.ts.no }}</template>
+							<MkSwitch v-model="policies.canChat">
+								<template #label>{{ i18n.ts.enable }}</template>
+							</MkSwitch>
+						</MkFolder>
+
 						<MkFolder v-if="matchQuery([i18n.ts._role._options.mentionMax, 'mentionLimit'])">
 							<template #label>{{ i18n.ts._role._options.mentionMax }}</template>
 							<template #suffix>{{ policies.mentionLimit }}</template>
diff --git a/packages/frontend/src/pages/chat/XMessage.vue b/packages/frontend/src/pages/chat/XMessage.vue
new file mode 100644
index 0000000000..1e7f8e20ea
--- /dev/null
+++ b/packages/frontend/src/pages/chat/XMessage.vue
@@ -0,0 +1,245 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="[$style.root, { [$style.isMe]: isMe }]">
+	<MkAvatar :class="$style.avatar" :user="message.fromUser" :link="!isMe" :preview="false"/>
+	<div :class="$style.body">
+		<MkFukidashi :class="$style.fukidashi" :tail="isMe ? 'right' : 'left'" :accented="isMe">
+			<div v-if="!message.isDeleted" :class="$style.content">
+				<Mfm v-if="message.text" ref="text" class="_selectable" :text="message.text" :i="$i"/>
+				<MkMediaList v-if="message.file" :mediaList="[message.file]" :class="$style.file"/>
+			</div>
+			<div v-else :class="$style.content">
+				<p>{{ i18n.ts.deleted }}</p>
+			</div>
+		</MkFukidashi>
+		<MkUrlPreview v-for="url in urls" :key="url" :url="url" style="margin: 8px 0;"/>
+		<div :class="$style.footer">
+			<button class="_textButton" style="color: currentColor;" @click="showMenu"><i class="ti ti-dots-circle-horizontal"></i></button>
+			<MkTime :class="$style.time" :time="message.createdAt"/>
+			<MkA v-if="isSearchResult && message.toRoomId" :to="`/chat/room/${message.toRoomId}`">{{ message.toRoom.name }}</MkA>
+			<MkA v-if="isSearchResult && message.toUserId && isMe" :to="`/chat/user/${message.toUserId}`">@{{ message.toUser.username }}</MkA>
+		</div>
+		<TransitionGroup
+			:enterActiveClass="prefer.s.animation ? $style.transition_reaction_enterActive : ''"
+			:leaveActiveClass="prefer.s.animation ? $style.transition_reaction_leaveActive : ''"
+			:enterFromClass="prefer.s.animation ? $style.transition_reaction_enterFrom : ''"
+			:leaveToClass="prefer.s.animation ? $style.transition_reaction_leaveTo : ''"
+			:moveClass="prefer.s.animation ? $style.transition_reaction_move : ''"
+			tag="div" :class="$style.reactions"
+		>
+			<div v-for="record in message.reactions" :key="record.reaction + record.user.id" :class="$style.reaction">
+				<MkAvatar :user="record.user" :link="false" :class="$style.reactionAvatar"/>
+				<MkReactionIcon
+					:withTooltip="true"
+					:reaction="record.reaction.replace(/^:(\w+):$/, ':$1@.:')"
+					:noStyle="true"
+					:class="$style.reactionIcon"
+				/>
+			</div>
+		</TransitionGroup>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, defineAsyncComponent } from 'vue';
+import * as mfm from 'mfm-js';
+import * as Misskey from 'misskey-js';
+import { url } from '@@/js/config.js';
+import type { MenuItem } from '@/types/menu.js';
+import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm.js';
+import MkUrlPreview from '@/components/MkUrlPreview.vue';
+import { ensureSignin } from '@/i.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { i18n } from '@/i18n.js';
+import MkFukidashi from '@/components/MkFukidashi.vue';
+import * as os from '@/os.js';
+import { copyToClipboard } from '@/utility/copy-to-clipboard.js';
+import MkMediaList from '@/components/MkMediaList.vue';
+import { reactionPicker } from '@/utility/reaction-picker.js';
+import * as sound from '@/utility/sound.js';
+import MkReactionIcon from '@/components/MkReactionIcon.vue';
+import { prefer } from '@/preferences.js';
+
+const $i = ensureSignin();
+
+const props = defineProps<{
+	message: Misskey.entities.ChatMessageLite | Misskey.entities.ChatMessage;
+	isSearchResult?: boolean;
+}>();
+
+const isMe = computed(() => props.message.fromUserId === $i.id);
+const urls = computed(() => props.message.text ? extractUrlFromMfm(mfm.parse(props.message.text)) : []);
+
+function react(ev: MouseEvent) {
+	reactionPicker.show(ev.currentTarget ?? ev.target, null, async (reaction) => {
+		sound.playMisskeySfx('reaction');
+
+		misskeyApi('chat/messages/react', {
+			messageId: props.message.id,
+			reaction: reaction,
+		});
+	});
+}
+
+function showMenu(ev: MouseEvent) {
+	const menu: MenuItem[] = [];
+
+	if (!isMe.value) {
+		menu.push({
+			text: i18n.ts.reaction,
+			icon: 'ti ti-mood-plus',
+			action: (ev) => {
+				react(ev);
+			},
+		});
+
+		menu.push({
+			type: 'divider',
+		});
+	}
+
+	menu.push({
+		text: i18n.ts.copyContent,
+		icon: 'ti ti-copy',
+		action: () => {
+			copyToClipboard(props.message.text);
+		},
+	});
+
+	menu.push({
+		type: 'divider',
+	});
+
+	if (isMe.value) {
+		menu.push({
+			text: i18n.ts.delete,
+			icon: 'ti ti-trash',
+			danger: true,
+			action: () => {
+				misskeyApi('chat/messages/delete', {
+					messageId: props.message.id,
+				});
+			},
+		});
+	} else {
+		menu.push({
+			text: i18n.ts.reportAbuse,
+			icon: 'ti ti-exclamation-circle',
+			action: () => {
+				const localUrl = `${url}/chat/messages/${props.message.id}`;
+				const { dispose } = os.popup(defineAsyncComponent(() => import('@/components/MkAbuseReportWindow.vue')), {
+					user: props.message.fromUser,
+					initialComment: `${localUrl}\n-----\n`,
+				}, {
+					closed: () => dispose(),
+				});
+			},
+		});
+	}
+
+	os.popupMenu(menu, ev.currentTarget ?? ev.target);
+}
+</script>
+
+<style lang="scss" module>
+.transition_reaction_move,
+.transition_reaction_enterActive,
+.transition_reaction_leaveActive {
+	transition: opacity 0.2s cubic-bezier(0,.5,.5,1), transform 0.2s cubic-bezier(0,.5,.5,1) !important;
+}
+.transition_reaction_enterFrom,
+.transition_reaction_leaveTo {
+	opacity: 0;
+	transform: scale(0.7);
+}
+.transition_reaction_leaveActive {
+	position: absolute;
+}
+
+.root {
+	position: relative;
+	display: flex;
+
+	&.isMe {
+		flex-direction: row-reverse;
+		text-align: right;
+
+		.content {
+			color: var(--MI_THEME-fgOnAccent);
+		}
+
+		.footer {
+			flex-direction: row-reverse;
+		}
+	}
+}
+
+.avatar {
+	position: sticky;
+	top: calc(16px + var(--MI-stickyTop, 0px));
+	display: block;
+	width: 52px;
+	height: 52px;
+}
+
+.body {
+	margin: 0 12px;
+}
+
+.content {
+	overflow: clip;
+	overflow-wrap: break-word;
+	word-break: break-word;
+}
+
+.file {
+}
+
+.footer {
+	display: flex;
+	flex-direction: row;
+	gap: 0.5em;
+	margin-top: 4px;
+	font-size: 75%;
+}
+
+.time {
+	opacity: 0.5;
+}
+
+.reactions {
+	display: flex;
+	flex-wrap: wrap;
+	align-items: center;
+	gap: 8px;
+	margin-top: 8px;
+
+	&:empty {
+		display: none;
+	}
+}
+
+.reaction {
+	display: flex;
+	align-items: center;
+	border: solid 1px var(--MI_THEME-divider);
+	border-radius: 999px;
+	padding: 8px;
+}
+
+.reactionAvatar {
+	width: 24px;
+	height: 24px;
+	margin-right: 8px;
+}
+
+.reactionIcon {
+	width: 24px;
+	height: 24px;
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/XRoom.vue b/packages/frontend/src/pages/chat/XRoom.vue
new file mode 100644
index 0000000000..b063a0cdd1
--- /dev/null
+++ b/packages/frontend/src/pages/chat/XRoom.vue
@@ -0,0 +1,41 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkA :to="`/chat/room/${room.id}`" class="_panel _gaps_s" :class="$style.root">
+	<div :class="$style.header">
+		<div style="font-weight: bold;">{{ room.name }}</div>
+		<MkAvatar :user="room.owner" :link="false" :class="$style.headerAvatar"/>
+	</div>
+	<hr>
+	<div>{{ room.description }}</div>
+</MkA>
+</template>
+
+<script lang="ts" setup>
+import * as Misskey from 'misskey-js';
+
+const props = defineProps<{
+	room: Misskey.entities.ChatRoom;
+}>();
+
+</script>
+
+<style lang="scss" module>
+.root {
+	padding: 16px;
+}
+
+.header {
+	display: flex;
+	align-items: center;
+}
+
+.headerAvatar {
+	width: 30px;
+	height: 30px;
+	margin-left: auto;
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/home.home.vue b/packages/frontend/src/pages/chat/home.home.vue
new file mode 100644
index 0000000000..1d0605136c
--- /dev/null
+++ b/packages/frontend/src/pages/chat/home.home.vue
@@ -0,0 +1,252 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<MkButton primary gradate rounded :class="$style.start" @click="start"><i class="ti ti-plus"></i> {{ i18n.ts.startChat }}</MkButton>
+
+	<MkAd :prefer="['horizontal', 'horizontal-big']"/>
+
+	<MkInput
+		v-model="searchQuery"
+		:placeholder="i18n.ts._chat.searchMessages"
+		type="search"
+	>
+		<template #prefix><i class="ti ti-search"></i></template>
+	</MkInput>
+
+	<MkButton v-if="searchQuery.length > 0" primary rounded @click="search">{{ i18n.ts.search }}</MkButton>
+
+	<MkFoldableSection v-if="searched">
+		<template #header>{{ i18n.ts.searchResult }}</template>
+
+		<div class="_gaps_s">
+			<div v-for="message in searchResults" :key="message.id" :class="$style.searchResultItem">
+				<XMessage :message="message" :isSearchResult="true"/>
+			</div>
+		</div>
+	</MkFoldableSection>
+
+	<MkFoldableSection>
+		<template #header>{{ i18n.ts._chat.history }}</template>
+
+		<div v-if="history.length > 0" class="_gaps_s">
+			<MkA
+				v-for="item in history"
+				:key="item.id"
+				:class="[$style.message, { [$style.isMe]: item.isMe, [$style.isRead]: item.message.isRead }]"
+				class="_panel"
+				:to="item.message.toRoomId ? `/chat/room/${item.message.toRoomId}` : `/chat/user/${item.other!.id}`"
+			>
+				<MkAvatar v-if="item.other" :class="$style.messageAvatar" :user="item.other" indicator :preview="false"/>
+				<div :class="$style.messageBody">
+					<header v-if="item.message.toRoom" :class="$style.messageHeader">
+						<span :class="$style.messageHeaderName">{{ item.message.toRoom.name }}</span>
+						<MkTime :time="item.message.createdAt" :class="$style.messageHeaderTime"/>
+					</header>
+					<header v-else :class="$style.messageHeader">
+						<MkUserName :class="$style.messageHeaderName" :user="item.other!"/>
+						<MkAcct :class="$style.messageHeaderUsername" :user="item.other!"/>
+						<MkTime :time="item.message.createdAt" :class="$style.messageHeaderTime"/>
+					</header>
+					<div :class="$style.messageBodyText"><span v-if="item.isMe" :class="$style.youSaid">{{ i18n.ts.you }}:</span>{{ item.message.text }}</div>
+				</div>
+			</MkA>
+		</div>
+		<div v-if="!fetching && history.length == 0" class="_fullinfo">
+			<div>{{ i18n.ts._chat.noHistory }}</div>
+		</div>
+		<MkLoading v-if="fetching"/>
+	</MkFoldableSection>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref } from 'vue';
+import * as Misskey from 'misskey-js';
+import XMessage from './XMessage.vue';
+import MkButton from '@/components/MkButton.vue';
+import { i18n } from '@/i18n.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { ensureSignin } from '@/i.js';
+import { useRouter } from '@/router.js';
+import * as os from '@/os.js';
+import { updateCurrentAccountPartial } from '@/accounts.js';
+import MkInput from '@/components/MkInput.vue';
+import MkFoldableSection from '@/components/MkFoldableSection.vue';
+
+const $i = ensureSignin();
+
+const router = useRouter();
+
+const fetching = ref(true);
+const history = ref<{
+	id: string;
+	message: Misskey.entities.ChatMessage;
+	other: Misskey.entities.ChatMessage['fromUser'] | Misskey.entities.ChatMessage['toUser'] | null;
+	isMe: boolean;
+}[]>([]);
+
+const searchQuery = ref('');
+const searched = ref(false);
+const searchResults = ref<Misskey.entities.ChatMessage[]>([]);
+
+function start(ev: MouseEvent) {
+	os.popupMenu([{
+		text: i18n.ts._chat.individualChat,
+		caption: i18n.ts._chat.individualChat_description,
+		icon: 'ti ti-user',
+		action: () => { startUser(); },
+	}, { type: 'divider' }, {
+		type: 'parent',
+		text: i18n.ts._chat.roomChat,
+		caption: i18n.ts._chat.roomChat_description,
+		icon: 'ti ti-users-group',
+		children: [{
+			text: i18n.ts._chat.createRoom,
+			icon: 'ti ti-plus',
+			action: () => { createRoom(); },
+		}],
+	}], ev.currentTarget ?? ev.target);
+}
+
+async function startUser() {
+	os.selectUser().then(user => {
+		router.push(`/chat/user/${user.id}`);
+	});
+}
+
+async function createRoom() {
+	const { canceled, result } = await os.inputText({
+		title: i18n.ts.name,
+		minLength: 1,
+	});
+	if (canceled) return;
+
+	const room = await misskeyApi('chat/rooms/create', {
+		name: result,
+	});
+
+	router.push(`/chat/room/${room.id}`);
+}
+
+async function search() {
+	const res = await misskeyApi('chat/messages/search', {
+		query: searchQuery.value,
+	});
+
+	searchResults.value = res;
+	searched.value = true;
+}
+
+async function fetchHistory() {
+	fetching.value = true;
+
+	const [userMessages, roomMessages] = await Promise.all([
+		misskeyApi('chat/history', { room: false }),
+		misskeyApi('chat/history', { room: true }),
+	]);
+
+	history.value = [...userMessages, ...roomMessages]
+		.toSorted((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime())
+		.map(m => ({
+			id: m.id,
+			message: m,
+			other: m.room == null ? (m.fromUserId === $i.id ? m.toUser : m.fromUser) : null,
+			isMe: m.fromUserId === $i.id,
+		}));
+
+	fetching.value = false;
+
+	updateCurrentAccountPartial({ hasUnreadChatMessages: false });
+}
+
+onMounted(() => {
+	fetchHistory();
+});
+</script>
+
+<style lang="scss" module>
+.start {
+	margin: 0 auto;
+}
+
+.message {
+	position: relative;
+	display: flex;
+	padding: 16px 24px;
+
+	&.isRead,
+	&.isMe {
+		opacity: 0.8;
+	}
+
+	&:not(.isMe):not(.isRead) {
+		&::before {
+			content: '';
+			position: absolute;
+			top: 8px;
+			right: 8px;
+			width: 8px;
+			height: 8px;
+			border-radius: 100%;
+			background-color: var(--MI_THEME-accent);
+		}
+	}
+}
+
+.messageAvatar {
+	width: 50px;
+	height: 50px;
+	margin: 0 16px 0 0;
+}
+
+.messageBody {
+	flex: 1;
+	min-width: 0;
+}
+
+.messageHeader {
+	display: flex;
+	align-items: center;
+	margin-bottom: 2px;
+	white-space: nowrap;
+	overflow: clip;
+}
+
+.messageHeaderName {
+	margin: 0;
+	padding: 0;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	font-size: 1em;
+	font-weight: bold;
+}
+
+.messageHeaderUsername {
+	margin: 0 8px;
+}
+
+.messageHeaderTime {
+	margin-left: auto;
+}
+
+.messageBodyText {
+	overflow: hidden;
+	overflow-wrap: break-word;
+	font-size: 1.1em;
+}
+
+.youSaid {
+	font-weight: bold;
+	margin-right: 0.5em;
+}
+
+.searchResultItem {
+	padding: 12px;
+	border: solid 1px var(--MI_THEME-divider);
+	border-radius: 12px;
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/home.invitations.vue b/packages/frontend/src/pages/chat/home.invitations.vue
new file mode 100644
index 0000000000..4c3c0b282e
--- /dev/null
+++ b/packages/frontend/src/pages/chat/home.invitations.vue
@@ -0,0 +1,98 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<div v-if="invitations.length > 0" class="_gaps_s">
+		<MkFolder v-for="invitation in invitations" :key="invitation.id" :defaultOpen="true">
+			<template #icon><i class="ti ti-users-group"></i></template>
+			<template #label>{{ invitation.room.name }}</template>
+			<template #suffix><MkTime :time="invitation.createdAt"/></template>
+			<template #footer>
+				<div class="_buttons">
+					<MkButton primary @click="join(invitation)"><i class="ti ti-plus"></i> {{ i18n.ts._chat.join }}</MkButton>
+					<MkButton danger @click="ignore(invitation)"><i class="ti ti-x"></i> {{ i18n.ts._chat.ignore }}</MkButton>
+				</div>
+			</template>
+
+			<div :class="$style.invitationBody">
+				<MkAvatar :user="invitation.room.owner" :class="$style.invitationBodyAvatar" link/>
+				<div style="flex: 1;" class="_gaps_s">
+					<MkUserName :user="invitation.room.owner"/>
+					<hr>
+					<div>{{ invitation.room.description === '' ? i18n.ts.noDescription : invitation.room.description }}</div>
+				</div>
+			</div>
+		</MkFolder>
+	</div>
+	<div v-if="!fetching && invitations.length == 0" class="_fullinfo">
+		<div>{{ i18n.ts._chat.noInvitations }}</div>
+	</div>
+	<MkLoading v-if="fetching"/>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref } from 'vue';
+import * as Misskey from 'misskey-js';
+import MkButton from '@/components/MkButton.vue';
+import { i18n } from '@/i18n.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { ensureSignin } from '@/i.js';
+import { useRouter } from '@/router.js';
+import * as os from '@/os.js';
+import MkFolder from '@/components/MkFolder.vue';
+
+const $i = ensureSignin();
+
+const router = useRouter();
+
+const fetching = ref(true);
+const invitations = ref<Misskey.entities.ChatRoomInvitation[]>([]);
+
+async function fetchInvitations() {
+	fetching.value = true;
+
+	const res = await misskeyApi('chat/rooms/invitations/inbox', {
+	});
+
+	invitations.value = res;
+
+	fetching.value = false;
+}
+
+async function join(invitation: Misskey.entities.ChatRoomInvitation) {
+	await misskeyApi('chat/rooms/join', {
+		roomId: invitation.room.id,
+	});
+
+	router.push(`/chat/room/${invitation.room.id}`);
+}
+
+async function ignore(invitation: Misskey.entities.ChatRoomInvitation) {
+	await misskeyApi('chat/rooms/invitations/ignore', {
+		roomId: invitation.room.id,
+	});
+
+	invitations.value = invitations.value.filter(i => i.id !== invitation.id);
+}
+
+onMounted(() => {
+	fetchInvitations();
+});
+</script>
+
+<style lang="scss" module>
+.invitationBody {
+	display: flex;
+	align-items: center;
+}
+
+.invitationBodyAvatar {
+	margin-right: 12px;
+	width: 45px;
+	height: 45px;
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/home.joiningRooms.vue b/packages/frontend/src/pages/chat/home.joiningRooms.vue
new file mode 100644
index 0000000000..63e4d2adf8
--- /dev/null
+++ b/packages/frontend/src/pages/chat/home.joiningRooms.vue
@@ -0,0 +1,54 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<div v-if="memberships.length > 0" class="_gaps_s">
+		<XRoom v-for="membership in memberships" :key="membership.id" :room="membership.room"/>
+	</div>
+	<div v-if="!fetching && memberships.length == 0" class="_fullinfo">
+		<div>{{ i18n.ts._chat.noRooms }}</div>
+	</div>
+	<MkLoading v-if="fetching"/>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref } from 'vue';
+import * as Misskey from 'misskey-js';
+import XRoom from './XRoom.vue';
+import MkButton from '@/components/MkButton.vue';
+import { i18n } from '@/i18n.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { ensureSignin } from '@/i.js';
+import { useRouter } from '@/router.js';
+import * as os from '@/os.js';
+
+const $i = ensureSignin();
+
+const router = useRouter();
+
+const fetching = ref(true);
+const memberships = ref<Misskey.entities.ChatRoomMembership[]>([]);
+
+async function fetchRooms() {
+	fetching.value = true;
+
+	const res = await misskeyApi('chat/rooms/joining', {
+	});
+
+	memberships.value = res;
+
+	fetching.value = false;
+}
+
+onMounted(() => {
+	fetchRooms();
+});
+</script>
+
+<style lang="scss" module>
+
+</style>
diff --git a/packages/frontend/src/pages/chat/home.ownedRooms.vue b/packages/frontend/src/pages/chat/home.ownedRooms.vue
new file mode 100644
index 0000000000..b0449fb373
--- /dev/null
+++ b/packages/frontend/src/pages/chat/home.ownedRooms.vue
@@ -0,0 +1,54 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<div v-if="rooms.length > 0" class="_gaps_s">
+		<XRoom v-for="room in rooms" :key="room.id" :room="room"/>
+	</div>
+	<div v-if="!fetching && rooms.length == 0" class="_fullinfo">
+		<div>{{ i18n.ts._chat.noRooms }}</div>
+	</div>
+	<MkLoading v-if="fetching"/>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref } from 'vue';
+import * as Misskey from 'misskey-js';
+import XRoom from './XRoom.vue';
+import MkButton from '@/components/MkButton.vue';
+import { i18n } from '@/i18n.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { ensureSignin } from '@/i.js';
+import { useRouter } from '@/router.js';
+import * as os from '@/os.js';
+
+const $i = ensureSignin();
+
+const router = useRouter();
+
+const fetching = ref(true);
+const rooms = ref<Misskey.entities.ChatRoom[]>([]);
+
+async function fetchRooms() {
+	fetching.value = true;
+
+	const res = await misskeyApi('chat/rooms/owned', {
+	});
+
+	rooms.value = res;
+
+	fetching.value = false;
+}
+
+onMounted(() => {
+	fetchRooms();
+});
+</script>
+
+<style lang="scss" module>
+
+</style>
diff --git a/packages/frontend/src/pages/chat/home.vue b/packages/frontend/src/pages/chat/home.vue
new file mode 100644
index 0000000000..c2b272a42d
--- /dev/null
+++ b/packages/frontend/src/pages/chat/home.vue
@@ -0,0 +1,60 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<PageWithHeader v-model:tab="tab" :actions="headerActions" :tabs="headerTabs">
+	<MkPolkadots v-if="tab === 'home'" accented/>
+	<MkSpacer :contentMax="700">
+		<MkHorizontalSwipe v-model:tab="tab" :tabs="headerTabs">
+			<XHome v-if="tab === 'home'"/>
+			<XInvitations v-else-if="tab === 'invitations'"/>
+			<XJoiningRooms v-else-if="tab === 'joiningRooms'"/>
+			<XOwnedRooms v-else-if="tab === 'ownedRooms'"/>
+		</MkHorizontalSwipe>
+	</MkSpacer>
+</PageWithHeader>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref } from 'vue';
+import XHome from './home.home.vue';
+import XInvitations from './home.invitations.vue';
+import XJoiningRooms from './home.joiningRooms.vue';
+import XOwnedRooms from './home.ownedRooms.vue';
+import { i18n } from '@/i18n.js';
+import { definePage } from '@/page.js';
+import MkHorizontalSwipe from '@/components/MkHorizontalSwipe.vue';
+import MkPolkadots from '@/components/MkPolkadots.vue';
+
+const tab = ref('home');
+
+const headerActions = computed(() => []);
+
+const headerTabs = computed(() => [{
+	key: 'home',
+	title: i18n.ts._chat.home,
+	icon: 'ti ti-home',
+}, {
+	key: 'invitations',
+	title: i18n.ts._chat.invitations,
+	icon: 'ti ti-ticket',
+}, {
+	key: 'joiningRooms',
+	title: i18n.ts._chat.joiningRooms,
+	icon: 'ti ti-users-group',
+}, {
+	key: 'ownedRooms',
+	title: i18n.ts._chat.yourRooms,
+	icon: 'ti ti-settings',
+}]);
+
+definePage(() => ({
+	title: i18n.ts.chat + ' (beta)',
+	icon: 'ti ti-message',
+}));
+</script>
+
+<style lang="scss" module>
+</style>
diff --git a/packages/frontend/src/pages/chat/message.vue b/packages/frontend/src/pages/chat/message.vue
new file mode 100644
index 0000000000..be8be7e5d1
--- /dev/null
+++ b/packages/frontend/src/pages/chat/message.vue
@@ -0,0 +1,55 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<PageWithHeader>
+	<MkSpacer :contentMax="700">
+		<div v-if="initializing">
+			<MkLoading/>
+		</div>
+		<div v-else>
+			<XMessage :message="message"/>
+		</div>
+	</MkSpacer>
+</PageWithHeader>
+</template>
+
+<script lang="ts" setup>
+import { ref, useTemplateRef, computed, watch, onMounted, nextTick, onBeforeUnmount, onDeactivated, onActivated } from 'vue';
+import * as Misskey from 'misskey-js';
+import XMessage from './XMessage.vue';
+import * as os from '@/os.js';
+import { useStream } from '@/stream.js';
+import { i18n } from '@/i18n.js';
+import { ensureSignin } from '@/i.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { definePage } from '@/page.js';
+import MkButton from '@/components/MkButton.vue';
+
+const props = defineProps<{
+	messageId?: string;
+}>();
+
+const initializing = ref(true);
+const message = ref<Misskey.entities.ChatMessage>();
+
+async function initialize() {
+	initializing.value = true;
+
+	message.value = await misskeyApi('chat/messages/show', {
+		messageId: props.messageId,
+	});
+
+	initializing.value = false;
+}
+
+onMounted(() => {
+	initialize();
+});
+
+definePage({
+	title: i18n.ts.chat,
+});
+</script>
diff --git a/packages/frontend/src/pages/chat/room.form.vue b/packages/frontend/src/pages/chat/room.form.vue
new file mode 100644
index 0000000000..aba9d6061f
--- /dev/null
+++ b/packages/frontend/src/pages/chat/room.form.vue
@@ -0,0 +1,333 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div
+	:class="$style.root"
+	@dragover.stop="onDragover"
+	@drop.stop="onDrop"
+>
+	<textarea
+		ref="textareaEl"
+		v-model="text"
+		:class="$style.textarea"
+		class="_acrylic"
+		:placeholder="i18n.ts.inputMessageHere"
+		:readonly="textareaReadOnly"
+		@keydown="onKeydown"
+		@paste="onPaste"
+	></textarea>
+	<footer :class="$style.footer">
+		<div v-if="file" :class="$style.file" @click="file = null">{{ file.name }}</div>
+		<div :class="$style.buttons">
+			<button class="_button" :class="$style.button" @click="chooseFile"><i class="ti ti-photo-plus"></i></button>
+			<button class="_button" :class="$style.button" @click="insertEmoji"><i class="ti ti-mood-happy"></i></button>
+			<button class="_button" :class="[$style.button, $style.send]" :disabled="!canSend || sending" :title="i18n.ts.send" @click="send">
+				<template v-if="!sending"><i class="ti ti-send"></i></template><template v-if="sending"><MkLoading :em="true"/></template>
+			</button>
+		</div>
+	</footer>
+	<input ref="fileEl" style="display: none;" type="file" @change="onChangeFile"/>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { onMounted, watch, ref, shallowRef, computed, nextTick, readonly } from 'vue';
+import * as Misskey from 'misskey-js';
+//import insertTextAtCursor from 'insert-text-at-cursor';
+import { throttle } from 'throttle-debounce';
+import { formatTimeString } from '@/utility/format-time-string.js';
+import { selectFile } from '@/utility/select-file.js';
+import * as os from '@/os.js';
+import { useStream } from '@/stream.js';
+import { i18n } from '@/i18n.js';
+import { uploadFile } from '@/utility/upload.js';
+import { miLocalStorage } from '@/local-storage.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { prefer } from '@/preferences.js';
+import { Autocomplete } from '@/utility/autocomplete.js';
+import { emojiPicker } from '@/utility/emoji-picker.js';
+
+const props = defineProps<{
+	user?: Misskey.entities.UserDetailed | null;
+	room?: Misskey.entities.ChatRoom | null;
+}>();
+
+const textareaEl = shallowRef<HTMLTextAreaElement>();
+const fileEl = shallowRef<HTMLInputElement>();
+
+const text = ref<string>('');
+const file = ref<Misskey.entities.DriveFile | null>(null);
+const sending = ref(false);
+const textareaReadOnly = ref(false);
+
+const canSend = computed(() => (text.value != null && text.value !== '') || file.value != null);
+
+function getDraftKey() {
+	return props.user ? 'user:' + props.user.id : 'room:' + props.room?.id;
+}
+
+watch([text, file], saveDraft);
+
+async function onPaste(ev: ClipboardEvent) {
+	if (!ev.clipboardData) return;
+
+	const pastedFileName = 'yyyy-MM-dd HH-mm-ss [{{number}}]';
+
+	const clipboardData = ev.clipboardData;
+	const items = clipboardData.items;
+
+	if (items.length === 1) {
+		if (items[0].kind === 'file') {
+			const pastedFile = items[0].getAsFile();
+			if (!pastedFile) return;
+			const lio = pastedFile.name.lastIndexOf('.');
+			const ext = lio >= 0 ? pastedFile.name.slice(lio) : '';
+			const formatted = formatTimeString(new Date(pastedFile.lastModified), pastedFileName).replace(/{{number}}/g, '1') + ext;
+			if (formatted) upload(pastedFile, formatted);
+		}
+	} else {
+		if (items[0].kind === 'file') {
+			os.alert({
+				type: 'error',
+				text: i18n.ts.onlyOneFileCanBeAttached,
+			});
+		}
+	}
+}
+
+function onDragover(ev: DragEvent) {
+	if (!ev.dataTransfer) return;
+
+	const isFile = ev.dataTransfer.items[0].kind === 'file';
+	const isDriveFile = ev.dataTransfer.types[0] === _DATA_TRANSFER_DRIVE_FILE_;
+	if (isFile || isDriveFile) {
+		ev.preventDefault();
+		switch (ev.dataTransfer.effectAllowed) {
+			case 'all':
+			case 'uninitialized':
+			case 'copy':
+			case 'copyLink':
+			case 'copyMove':
+				ev.dataTransfer.dropEffect = 'copy';
+				break;
+			case 'linkMove':
+			case 'move':
+				ev.dataTransfer.dropEffect = 'move';
+				break;
+			default:
+				ev.dataTransfer.dropEffect = 'none';
+				break;
+		}
+	}
+}
+
+function onDrop(ev: DragEvent): void {
+	if (!ev.dataTransfer) return;
+
+	// ファイルだったら
+	if (ev.dataTransfer.files.length === 1) {
+		ev.preventDefault();
+		upload(ev.dataTransfer.files[0]);
+		return;
+	} else if (ev.dataTransfer.files.length > 1) {
+		ev.preventDefault();
+		os.alert({
+			type: 'error',
+			text: i18n.ts.onlyOneFileCanBeAttached,
+		});
+		return;
+	}
+
+	//#region ドライブのファイル
+	const driveFile = ev.dataTransfer.getData(_DATA_TRANSFER_DRIVE_FILE_);
+	if (driveFile != null && driveFile !== '') {
+		file.value = JSON.parse(driveFile);
+		ev.preventDefault();
+	}
+	//#endregion
+}
+
+function onKeydown(ev: KeyboardEvent) {
+	if ((ev.key === 'Enter') && (ev.ctrlKey || ev.metaKey)) {
+		send();
+	}
+}
+
+function chooseFile(ev: MouseEvent) {
+	selectFile(ev.currentTarget ?? ev.target, i18n.ts.selectFile).then(selectedFile => {
+		file.value = selectedFile;
+	});
+}
+
+function onChangeFile() {
+	if (fileEl.value.files![0]) upload(fileEl.value.files[0]);
+}
+
+function upload(fileToUpload: File, name?: string) {
+	uploadFile(fileToUpload, prefer.s.uploadFolder, name).then(res => {
+		file.value = res;
+	});
+}
+
+function send() {
+	if (!canSend.value) return;
+
+	sending.value = true;
+
+	if (props.user) {
+		misskeyApi('chat/messages/create-to-user', {
+			toUserId: props.user.id,
+			text: text.value ? text.value : undefined,
+			fileId: file.value ? file.value.id : undefined,
+		}).then(message => {
+			clear();
+		}).catch(err => {
+			console.error(err);
+		}).then(() => {
+			sending.value = false;
+		});
+	} else if (props.room) {
+		misskeyApi('chat/messages/create-to-room', {
+			toRoomId: props.room.id,
+			text: text.value ? text.value : undefined,
+			fileId: file.value ? file.value.id : undefined,
+		}).then(message => {
+			clear();
+		}).catch(err => {
+			console.error(err);
+		}).then(() => {
+			sending.value = false;
+		});
+	}
+}
+
+function clear() {
+	text.value = '';
+	file.value = null;
+	deleteDraft();
+}
+
+function saveDraft() {
+	const drafts = JSON.parse(miLocalStorage.getItem('chatMessageDrafts') || '{}');
+
+	drafts[getDraftKey()] = {
+		updatedAt: new Date(),
+		data: {
+			text: text.value,
+			file: file.value,
+		},
+	};
+
+	miLocalStorage.setItem('chatMessageDrafts', JSON.stringify(drafts));
+}
+
+function deleteDraft() {
+	const drafts = JSON.parse(miLocalStorage.getItem('chatMessageDrafts') || '{}');
+
+	delete drafts[getDraftKey()];
+
+	miLocalStorage.setItem('chatMessageDrafts', JSON.stringify(drafts));
+}
+
+async function insertEmoji(ev: MouseEvent) {
+	textareaReadOnly.value = true;
+	const target = ev.currentTarget ?? ev.target;
+	if (target == null) return;
+
+	// emojiPickerはダイアログが閉じずにtextareaとやりとりするので、
+	// focustrapをかけているとinsertTextAtCursorが効かない
+	// そのため、投稿フォームのテキストに直接注入する
+	// See: https://github.com/misskey-dev/misskey/pull/14282
+	//      https://github.com/misskey-dev/misskey/issues/14274
+
+	let pos = textareaEl.value?.selectionStart ?? 0;
+	let posEnd = textareaEl.value?.selectionEnd ?? text.value.length;
+	emojiPicker.show(
+		target as HTMLElement,
+		emoji => {
+			const textBefore = text.value.substring(0, pos);
+			const textAfter = text.value.substring(posEnd);
+			text.value = textBefore + emoji + textAfter;
+			pos += emoji.length;
+			posEnd += emoji.length;
+		},
+		() => {
+			textareaReadOnly.value = false;
+			nextTick(() => focus());
+		},
+	);
+}
+
+onMounted(() => {
+	// TODO: detach when unmount
+	new Autocomplete(textareaEl.value, text);
+
+	// 書きかけの投稿を復元
+	const draft = JSON.parse(miLocalStorage.getItem('chatMessageDrafts') || '{}')[getDraftKey()];
+	if (draft) {
+		text.value = draft.data.text;
+		file.value = draft.data.file;
+	}
+});
+</script>
+
+<style lang="scss" module>
+.root {
+	position: relative;
+	border-bottom: none;
+	border-radius: 14px 14px 0 0;
+	overflow: clip;
+}
+
+.textarea {
+	cursor: auto;
+	display: block;
+	width: 100%;
+	min-width: 100%;
+	max-width: 100%;
+	min-height: 80px;
+	margin: 0;
+	padding: 16px 16px 0 16px;
+	resize: none;
+	font-size: 1em;
+	font-family: inherit;
+	outline: none;
+	border: none;
+	border-radius: 0;
+	box-shadow: none;
+	box-sizing: border-box;
+	color: var(--MI_THEME-fg);
+	field-sizing: content;
+}
+
+.footer {
+	position: sticky;
+	bottom: 0;
+	background: var(--MI_THEME-panel);
+}
+
+.file {
+	padding: 8px;
+	cursor: pointer;
+}
+
+.buttons {
+	display: flex;
+}
+
+.button {
+	height: 50px;
+	aspect-ratio: 1;
+
+	&:hover {
+		color: var(--MI_THEME-accent);
+	}
+}
+.send {
+	margin-left: auto;
+	color: var(--MI_THEME-accent);
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/room.info.vue b/packages/frontend/src/pages/chat/room.info.vue
new file mode 100644
index 0000000000..7d38d07b3a
--- /dev/null
+++ b/packages/frontend/src/pages/chat/room.info.vue
@@ -0,0 +1,87 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<MkInput v-model="name_" :disabled="!isOwner">
+		<template #label>{{ i18n.ts.name }}</template>
+	</MkInput>
+
+	<MkTextarea v-model="description_" :disabled="!isOwner">
+		<template #label>{{ i18n.ts.description }}</template>
+	</MkTextarea>
+
+	<MkButton v-if="isOwner" primary @click="save">{{ i18n.ts.save }}</MkButton>
+
+	<hr>
+
+	<MkSwitch v-if="!isOwner" v-model="isMuted">
+		<template #label>{{ i18n.ts._chat.muteThisRoom }}</template>
+	</MkSwitch>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref, watch } from 'vue';
+import * as Misskey from 'misskey-js';
+import MkButton from '@/components/MkButton.vue';
+import { i18n } from '@/i18n.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import * as os from '@/os.js';
+import { ensureSignin } from '@/i.js';
+import MkInput from '@/components/MkInput.vue';
+import MkTextarea from '@/components/MkTextarea.vue';
+import MkSwitch from '@/components/MkSwitch.vue';
+
+const $i = ensureSignin();
+
+const props = defineProps<{
+	room: Misskey.entities.ChatRoom;
+}>();
+
+const isOwner = computed(() => {
+	return props.room.ownerId === $i.id;
+});
+
+const name_ = ref(props.room.name);
+const description_ = ref(props.room.description);
+
+function save() {
+	os.apiWithDialog('chat/rooms/update', {
+		roomId: props.room.id,
+		name: name_.value,
+		description: description_.value,
+	});
+}
+
+const isMuted = ref(props.room.isMuted);
+
+watch(isMuted, async () => {
+	await os.apiWithDialog('chat/rooms/mute', {
+		roomId: props.room.id,
+		mute: isMuted.value,
+	});
+});
+
+onMounted(async () => {
+
+});
+</script>
+
+<style lang="scss" module>
+.membership {
+	display: flex;
+}
+
+.membershipBody {
+	flex: 1;
+	min-width: 0;
+	margin-right: 8px;
+
+	&:hover {
+		text-decoration: none;
+	}
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/room.members.vue b/packages/frontend/src/pages/chat/room.members.vue
new file mode 100644
index 0000000000..d20216a81c
--- /dev/null
+++ b/packages/frontend/src/pages/chat/room.members.vue
@@ -0,0 +1,73 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<MkButton v-if="isOwner" primary rounded style="margin: 0 auto;" @click="emit('inviteUser')"><i class="ti ti-plus"></i> {{ i18n.ts._chat.inviteUser }}</MkButton>
+
+	<MkA :class="$style.membershipBody" :to="`${userPage(room.owner)}`">
+		<MkUserCardMini :user="room.owner"/>
+	</MkA>
+
+	<hr>
+
+	<div v-for="membership in memberships" :key="membership.id" :class="$style.membership">
+		<MkA :class="$style.membershipBody" :to="`${userPage(membership.user)}`">
+			<MkUserCardMini :user="membership.user"/>
+		</MkA>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref } from 'vue';
+import * as Misskey from 'misskey-js';
+import MkButton from '@/components/MkButton.vue';
+import { i18n } from '@/i18n.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import * as os from '@/os.js';
+import MkUserCardMini from '@/components/MkUserCardMini.vue';
+import { userPage } from '@/filters/user.js';
+import { ensureSignin } from '@/i.js';
+
+const $i = ensureSignin();
+
+const props = defineProps<{
+	room: Misskey.entities.ChatRoom;
+}>();
+
+const emit = defineEmits<{
+	(ev: 'inviteUser'): void,
+}>();
+
+const isOwner = computed(() => {
+	return props.room.ownerId === $i.id;
+});
+
+const memberships = ref<Misskey.entities.ChatRoomMembership[]>([]);
+
+onMounted(async () => {
+	memberships.value = await misskeyApi('chat/rooms/members', {
+		roomId: props.room.id,
+		limit: 50,
+	});
+});
+</script>
+
+<style lang="scss" module>
+.membership {
+	display: flex;
+}
+
+.membershipBody {
+	flex: 1;
+	min-width: 0;
+	margin-right: 8px;
+
+	&:hover {
+		text-decoration: none;
+	}
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/room.search.vue b/packages/frontend/src/pages/chat/room.search.vue
new file mode 100644
index 0000000000..de5e7156ca
--- /dev/null
+++ b/packages/frontend/src/pages/chat/room.search.vue
@@ -0,0 +1,68 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div class="_gaps">
+	<MkInput
+		v-model="searchQuery"
+		:placeholder="i18n.ts._chat.searchMessages"
+		type="search"
+	>
+		<template #prefix><i class="ti ti-search"></i></template>
+	</MkInput>
+
+	<MkButton v-if="searchQuery.length > 0" primary rounded @click="search">{{ i18n.ts.search }}</MkButton>
+
+	<MkFoldableSection v-if="searched">
+		<template #header>{{ i18n.ts.searchResult }}</template>
+
+		<div class="_gaps_s">
+			<div v-for="message in searchResults" :key="message.id" :class="$style.searchResultItem">
+				<XMessage :message="message" :user="message.fromUser" :isSearchResult="true"/>
+			</div>
+		</div>
+	</MkFoldableSection>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { computed, onMounted, ref } from 'vue';
+import * as Misskey from 'misskey-js';
+import XMessage from './XMessage.vue';
+import MkButton from '@/components/MkButton.vue';
+import { i18n } from '@/i18n.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import * as os from '@/os.js';
+import MkInput from '@/components/MkInput.vue';
+import MkFoldableSection from '@/components/MkFoldableSection.vue';
+
+const props = defineProps<{
+	userId?: string;
+	roomId?: string;
+}>();
+
+const searchQuery = ref('');
+const searched = ref(false);
+const searchResults = ref<Misskey.entities.ChatMessage[]>([]);
+
+async function search() {
+	const res = await misskeyApi('chat/messages/search', {
+		query: searchQuery.value,
+		roomId: props.roomId,
+		userId: props.userId,
+	});
+
+	searchResults.value = res;
+	searched.value = true;
+}
+</script>
+
+<style lang="scss" module>
+.searchResultItem {
+	padding: 12px;
+	border: solid 1px var(--MI_THEME-divider);
+	border-radius: 12px;
+}
+</style>
diff --git a/packages/frontend/src/pages/chat/room.vue b/packages/frontend/src/pages/chat/room.vue
new file mode 100644
index 0000000000..15e9f43db2
--- /dev/null
+++ b/packages/frontend/src/pages/chat/room.vue
@@ -0,0 +1,426 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<PageWithHeader v-model:tab="tab" :reversed="tab === 'chat'" :tabs="headerTabs" :actions="headerActions">
+	<MkSpacer v-if="tab === 'chat'" :contentMax="700">
+		<div v-if="initializing">
+			<MkLoading/>
+		</div>
+
+		<div v-else-if="messages.length === 0">
+			<div class="_gaps" style="text-align: center;">
+				<div>{{ i18n.ts._chat.noMessagesYet }}</div>
+				<template v-if="user">
+					<div v-if="user.chatScope === 'followers'">{{ i18n.ts._chat.thisUserAllowsChatOnlyFromFollowers }}</div>
+					<div v-else-if="user.chatScope === 'following'">{{ i18n.ts._chat.thisUserAllowsChatOnlyFromFollowing }}</div>
+					<div v-else-if="user.chatScope === 'mutual'">{{ i18n.ts._chat.thisUserAllowsChatOnlyFromMutualFollowing }}</div>
+					<div v-else>{{ i18n.ts._chat.thisUserNotAllowedChatAnyone }}</div>
+				</template>
+				<template v-else-if="room">
+					<div>{{ i18n.ts._chat.inviteUserToChat }}</div>
+				</template>
+			</div>
+		</div>
+
+		<div v-else class="_gaps">
+			<div v-if="canFetchMore">
+				<MkButton :class="$style.more" :wait="moreFetching" primary rounded @click="fetchMore">{{ i18n.ts.loadMore }}</MkButton>
+			</div>
+
+			<TransitionGroup
+				:enterActiveClass="prefer.s.animation ? $style.transition_x_enterActive : ''"
+				:leaveActiveClass="prefer.s.animation ? $style.transition_x_leaveActive : ''"
+				:enterFromClass="prefer.s.animation ? $style.transition_x_enterFrom : ''"
+				:leaveToClass="prefer.s.animation ? $style.transition_x_leaveTo : ''"
+				:moveClass="prefer.s.animation ? $style.transition_x_move : ''"
+				tag="div" class="_gaps"
+			>
+				<XMessage v-for="message in messages.toReversed()" :key="message.id" :message="message"/>
+			</TransitionGroup>
+		</div>
+	</MkSpacer>
+
+	<MkSpacer v-else-if="tab === 'search'" :contentMax="700">
+		<XSearch :userId="userId" :roomId="roomId"/>
+	</MkSpacer>
+
+	<MkSpacer v-else-if="tab === 'members'" :contentMax="700">
+		<XMembers v-if="room != null" :room="room" @inviteUser="inviteUser"/>
+	</MkSpacer>
+
+	<MkSpacer v-else-if="tab === 'info'" :contentMax="700">
+		<XInfo v-if="room != null" :room="room"/>
+	</MkSpacer>
+
+	<template #footer>
+		<div v-if="tab === 'chat'" :class="$style.footer">
+			<div class="_gaps">
+				<Transition name="fade">
+					<div v-show="showIndicator" :class="$style.new">
+						<button class="_buttonPrimary" :class="$style.newButton" @click="onIndicatorClick">
+							<i class="fas ti-fw fa-arrow-circle-down" :class="$style.newIcon"></i>{{ i18n.ts.newMessageExists }}
+						</button>
+					</div>
+				</Transition>
+				<XForm v-if="!initializing" :user="user" :room="room" :class="$style.form"/>
+			</div>
+		</div>
+	</template>
+</PageWithHeader>
+</template>
+
+<script lang="ts" setup>
+import { ref, useTemplateRef, computed, watch, onMounted, nextTick, onBeforeUnmount, onDeactivated, onActivated } from 'vue';
+import * as Misskey from 'misskey-js';
+import { isTailVisible } from '@@/js/scroll.js';
+import XMessage from './XMessage.vue';
+import XForm from './room.form.vue';
+import XSearch from './room.search.vue';
+import XMembers from './room.members.vue';
+import XInfo from './room.info.vue';
+import type { MenuItem } from '@/types/menu.js';
+import * as os from '@/os.js';
+import { useStream } from '@/stream.js';
+import * as sound from '@/utility/sound.js';
+import { i18n } from '@/i18n.js';
+import { ensureSignin } from '@/i.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { definePage } from '@/page.js';
+import { prefer } from '@/preferences.js';
+import MkButton from '@/components/MkButton.vue';
+import { useRouter } from '@/router.js';
+
+const $i = ensureSignin();
+const router = useRouter();
+
+const props = defineProps<{
+	userId?: string;
+	roomId?: string;
+}>();
+
+const initializing = ref(true);
+const moreFetching = ref(false);
+const messages = ref<Misskey.entities.ChatMessage[]>([]);
+const canFetchMore = ref(false);
+const user = ref<Misskey.entities.UserDetailed | null>(null);
+const room = ref<Misskey.entities.ChatRoom | null>(null);
+const connection = ref<Misskey.ChannelConnection<Misskey.Channels['chatUser'] | Misskey.Channels['chatRoom']> | null>(null);
+const showIndicator = ref(false);
+
+function normalizeMessage(message: Misskey.entities.ChatMessageLite | Misskey.entities.ChatMessage) {
+	const reactions = [...message.reactions];
+	for (const record of reactions) {
+		if (room.value == null && record.user == null) { // 1on1の時はuserは省略される
+			record.user = message.fromUserId === $i.id ? user.value : $i;
+		}
+	}
+
+	return {
+		...message,
+		fromUser: message.fromUser ?? (message.fromUserId === $i.id ? $i : user),
+		reactions,
+	};
+}
+
+async function initialize() {
+	const LIMIT = 20;
+
+	initializing.value = true;
+
+	if (props.userId) {
+		const [u, m] = await Promise.all([
+			misskeyApi('users/show', { userId: props.userId }),
+			misskeyApi('chat/messages/user-timeline', { userId: props.userId, limit: LIMIT }),
+		]);
+
+		user.value = u;
+		messages.value = m.map(x => normalizeMessage(x));
+
+		if (messages.value.length === LIMIT) {
+			canFetchMore.value = true;
+		}
+
+		connection.value = useStream().useChannel('chatUser', {
+			otherId: user.value.id,
+		});
+		connection.value.on('message', onMessage);
+		connection.value.on('deleted', onDeleted);
+		connection.value.on('react', onReact);
+	} else {
+		const [r, m] = await Promise.all([
+			misskeyApi('chat/rooms/show', { roomId: props.roomId }),
+			misskeyApi('chat/messages/room-timeline', { roomId: props.roomId, limit: LIMIT }),
+		]);
+
+		room.value = r;
+		messages.value = m.map(x => normalizeMessage(x));
+
+		if (messages.value.length === LIMIT) {
+			canFetchMore.value = true;
+		}
+
+		connection.value = useStream().useChannel('chatRoom', {
+			roomId: room.value.id,
+		});
+		connection.value.on('message', onMessage);
+		connection.value.on('deleted', onDeleted);
+		connection.value.on('react', onReact);
+	}
+
+	window.document.addEventListener('visibilitychange', onVisibilitychange);
+
+	initializing.value = false;
+}
+
+let isActivated = true;
+
+onActivated(() => {
+	isActivated = true;
+});
+
+onDeactivated(() => {
+	isActivated = false;
+});
+
+async function fetchMore() {
+	const LIMIT = 30;
+
+	moreFetching.value = true;
+
+	const newMessages = props.userId ? await misskeyApi('chat/messages/user-timeline', {
+		userId: user.value.id,
+		limit: LIMIT,
+		untilId: messages.value[messages.value.length - 1].id,
+	}) : await misskeyApi('chat/messages/room-timeline', {
+		roomId: room.value.id,
+		limit: LIMIT,
+		untilId: messages.value[messages.value.length - 1].id,
+	});
+
+	messages.value.push(...newMessages.map(x => normalizeMessage(x)));
+
+	canFetchMore.value = newMessages.length === LIMIT;
+	moreFetching.value = false;
+}
+
+function onMessage(message: Misskey.entities.ChatMessage) {
+	sound.playMisskeySfx('chatMessage');
+
+	messages.value.unshift(normalizeMessage(message));
+
+	// TODO: DOM的にバックグラウンドになっていないかどうかも考慮する
+	if (message.fromUserId !== $i.id && !window.document.hidden && isActivated) {
+		connection.value?.send('read', {
+			id: message.id,
+		});
+	}
+
+	if (message.fromUserId !== $i.id) {
+		//notifyNewMessage();
+	}
+}
+
+function onDeleted(id) {
+	const index = messages.value.findIndex(m => m.id === id);
+	if (index !== -1) {
+		messages.value.splice(index, 1);
+	}
+}
+
+function onReact(ctx) {
+	const message = messages.value.find(m => m.id === ctx.messageId);
+	if (message) {
+		if (room.value == null) { // 1on1の時はuserは省略される
+			message.reactions.push({
+				reaction: ctx.reaction,
+				user: message.fromUserId === $i.id ? user : $i,
+			});
+		} else {
+			message.reactions.push({
+				reaction: ctx.reaction,
+				user: ctx.user,
+			});
+		}
+	}
+}
+
+function onIndicatorClick() {
+	showIndicator.value = false;
+}
+
+function notifyNewMessage() {
+	showIndicator.value = true;
+}
+
+function onVisibilitychange() {
+	if (window.document.hidden) return;
+	// TODO
+}
+
+onMounted(() => {
+	initialize();
+});
+
+onBeforeUnmount(() => {
+	connection.value?.dispose();
+	window.document.removeEventListener('visibilitychange', onVisibilitychange);
+});
+
+async function inviteUser() {
+	const invitee = await os.selectUser({ includeSelf: false, localOnly: true });
+	os.apiWithDialog('chat/rooms/invitations/create', {
+		roomId: room.value?.id,
+		userId: invitee.id,
+	});
+}
+
+async function leaveRoom() {
+	const { canceled } = await os.confirm({
+		type: 'warning',
+		text: i18n.ts.areYouSure,
+	});
+	if (canceled) return;
+
+	misskeyApi('chat/rooms/leave', {
+		roomId: room.value?.id,
+	});
+	router.push('/chat');
+}
+
+function showMenu(ev: MouseEvent) {
+	const menuItems: MenuItem[] = [];
+
+	if (room.value) {
+		if (room.value.ownerId === $i.id) {
+			menuItems.push({
+				text: i18n.ts._chat.inviteUser,
+				icon: 'ti ti-user-plus',
+				action: () => {
+					inviteUser();
+				},
+			});
+		} else {
+			menuItems.push({
+				text: i18n.ts._chat.leave,
+				icon: 'ti ti-x',
+				action: () => {
+					leaveRoom();
+				},
+			});
+		}
+	}
+
+	os.popupMenu(menuItems, ev.currentTarget ?? ev.target);
+}
+
+const tab = ref('chat');
+
+const headerTabs = computed(() => room.value ? [{
+	key: 'chat',
+	title: i18n.ts.chat,
+	icon: 'ti ti-messages',
+}, {
+	key: 'members',
+	title: i18n.ts._chat.members,
+	icon: 'ti ti-users',
+}, {
+	key: 'search',
+	title: i18n.ts.search,
+	icon: 'ti ti-search',
+}, {
+	key: 'info',
+	title: i18n.ts.info,
+	icon: 'ti ti-info-circle',
+}] : [{
+	key: 'chat',
+	title: i18n.ts.chat,
+	icon: 'ti ti-messages',
+}, {
+	key: 'search',
+	title: i18n.ts.search,
+	icon: 'ti ti-search',
+}]);
+
+const headerActions = computed(() => [{
+	icon: 'ti ti-dots',
+	handler: showMenu,
+}]);
+
+definePage(computed(() => !initializing.value ? user.value ? {
+	userName: user,
+	avatar: user,
+} : {
+	title: room.value?.name,
+	icon: 'ti ti-users',
+} : null));
+</script>
+
+<style lang="scss" module>
+.transition_x_move,
+.transition_x_enterActive,
+.transition_x_leaveActive {
+	transition: opacity 0.2s cubic-bezier(0,.5,.5,1), transform 0.2s cubic-bezier(0,.5,.5,1) !important;
+}
+.transition_x_enterFrom,
+.transition_x_leaveTo {
+	opacity: 0;
+	transform: translateY(80px);
+}
+.transition_x_leaveActive {
+	position: absolute;
+}
+
+.root {
+}
+
+.more {
+	margin: 0 auto;
+}
+
+.footer {
+	width: 100%;
+	padding-top: 8px;
+}
+
+.new {
+	width: 100%;
+	padding-bottom: 8px;
+	text-align: center;
+}
+
+.newButton {
+	display: inline-block;
+	margin: 0;
+	padding: 0 12px;
+	line-height: 32px;
+	font-size: 12px;
+	border-radius: 16px;
+}
+
+.newIcon {
+	display: inline-block;
+	margin-right: 8px;
+}
+
+.footer {
+
+}
+
+.form {
+	margin: 0 auto;
+	width: 100%;
+	max-width: 700px;
+}
+
+.fade-enter-active, .fade-leave-active {
+	transition: opacity 0.1s;
+}
+
+.fade-enter-from, .fade-leave-to {
+	transition: opacity 0.5s;
+	opacity: 0;
+}
+</style>
diff --git a/packages/frontend/src/pages/settings/notifications.vue b/packages/frontend/src/pages/settings/notifications.vue
index 530b63b701..93a41e9ddd 100644
--- a/packages/frontend/src/pages/settings/notifications.vue
+++ b/packages/frontend/src/pages/settings/notifications.vue
@@ -38,7 +38,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<FormSection>
 		<div class="_gaps_m">
 			<FormLink @click="readAllNotifications">{{ i18n.ts.markAsReadAllNotifications }}</FormLink>
-			<FormLink @click="readAllUnreadNotes">{{ i18n.ts.markAsReadAllUnreadNotes }}</FormLink>
 		</div>
 	</FormSection>
 	<FormSection>
@@ -93,10 +92,6 @@ const pushRegistrationInServer = computed(() => allowButton.value?.pushRegistrat
 const sendReadMessage = computed(() => pushRegistrationInServer.value?.sendReadMessage || false);
 const userLists = await misskeyApi('users/lists/list');
 
-async function readAllUnreadNotes() {
-	await os.apiWithDialog('i/read-all-unread-notes');
-}
-
 async function readAllNotifications() {
 	await os.apiWithDialog('notifications/mark-all-as-read');
 }
diff --git a/packages/frontend/src/pages/settings/privacy.vue b/packages/frontend/src/pages/settings/privacy.vue
index f6eb203095..2f8a697d74 100644
--- a/packages/frontend/src/pages/settings/privacy.vue
+++ b/packages/frontend/src/pages/settings/privacy.vue
@@ -78,6 +78,20 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</MkSwitch>
 		</SearchMarker>
 
+		<FormSection>
+			<SearchMarker :keywords="['chat']">
+				<MkSelect v-model="chatScope" @update:modelValue="save()">
+					<template #label><SearchLabel>{{ i18n.ts._chat.chatAllowedUsers }}</SearchLabel></template>
+					<option value="everyone">{{ i18n.ts._chat._chatAllowedUsers.everyone }}</option>
+					<option value="followers">{{ i18n.ts._chat._chatAllowedUsers.followers }}</option>
+					<option value="following">{{ i18n.ts._chat._chatAllowedUsers.following }}</option>
+					<option value="mutual">{{ i18n.ts._chat._chatAllowedUsers.mutual }}</option>
+					<option value="none">{{ i18n.ts._chat._chatAllowedUsers.none }}</option>
+					<template #caption>{{ i18n.ts._chat.chatAllowedUsers_note }}</template>
+				</MkSelect>
+			</SearchMarker>
+		</FormSection>
+
 		<SearchMarker :keywords="['lockdown']">
 			<FormSection>
 				<template #label><SearchLabel>{{ i18n.ts.lockdown }}</SearchLabel><span class="_beta">{{ i18n.ts.beta }}</span></template>
@@ -208,6 +222,7 @@ const hideOnlineStatus = ref($i.hideOnlineStatus);
 const publicReactions = ref($i.publicReactions);
 const followingVisibility = ref($i.followingVisibility);
 const followersVisibility = ref($i.followersVisibility);
+const chatScope = ref($i.chatScope);
 
 const makeNotesFollowersOnlyBefore_type = computed(() => {
 	if (makeNotesFollowersOnlyBefore.value == null) {
@@ -260,6 +275,7 @@ function save() {
 		publicReactions: !!publicReactions.value,
 		followingVisibility: followingVisibility.value,
 		followersVisibility: followersVisibility.value,
+		chatScope: chatScope.value,
 	});
 }
 
diff --git a/packages/frontend/src/pages/settings/sounds.vue b/packages/frontend/src/pages/settings/sounds.vue
index 9e5c82a266..4461ee1ab1 100644
--- a/packages/frontend/src/pages/settings/sounds.vue
+++ b/packages/frontend/src/pages/settings/sounds.vue
@@ -85,6 +85,7 @@ const sounds = ref<Record<OperationType, Ref<SoundStore>>>({
 	noteMy: prefer.r['sound.on.noteMy'],
 	notification: prefer.r['sound.on.notification'],
 	reaction: prefer.r['sound.on.reaction'],
+	chatMessage: prefer.r['sound.on.chatMessage'],
 });
 
 function getSoundTypeName(f: SoundType): string {
diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index c3c37553d7..127ebeef0c 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -136,6 +136,7 @@ export const PREF_DEF = {
 			'clips',
 			'drive',
 			'followRequests',
+			'chat',
 			'-',
 			'explore',
 			'announcements',
@@ -331,6 +332,7 @@ export const PREF_DEF = {
 	plugins: {
 		default: [] as Plugin[],
 	},
+
 	'sound.masterVolume': {
 		default: 0.3,
 	},
@@ -352,6 +354,10 @@ export const PREF_DEF = {
 	'sound.on.reaction': {
 		default: { type: 'syuilo/bubble2', volume: 1 } as SoundStore,
 	},
+	'sound.on.chatMessage': {
+		default: { type: 'syuilo/waon', volume: 1 } as SoundStore,
+	},
+
 	'deck.alwaysShowMainColumn': {
 		default: true,
 	},
@@ -364,6 +370,7 @@ export const PREF_DEF = {
 	'deck.columnAlign': {
 		default: 'left' as 'left' | 'right' | 'center',
 	},
+
 	'game.dropAndFusion': {
 		default: {
 			bgmVolume: 0.25,
diff --git a/packages/frontend/src/router.definition.ts b/packages/frontend/src/router.definition.ts
index 3b60ee68e3..0585a31fd1 100644
--- a/packages/frontend/src/router.definition.ts
+++ b/packages/frontend/src/router.definition.ts
@@ -41,6 +41,22 @@ export const ROUTE_DEF = [{
 	path: '/clips/:clipId',
 	component: page(() => import('@/pages/clip.vue')),
 }, {
+	path: '/chat',
+	component: page(() => import('@/pages/chat/home.vue')),
+	loginRequired: true,
+}, {
+	path: '/chat/user/:userId',
+	component: page(() => import('@/pages/chat/room.vue')),
+	loginRequired: true,
+}, {
+	path: '/chat/room/:roomId',
+	component: page(() => import('@/pages/chat/room.vue')),
+	loginRequired: true,
+}, {
+	path: '/chat/messages/:messageId',
+	component: page(() => import('@/pages/chat/message.vue')),
+	loginRequired: true,
+}, {
 	path: '/instance-info/:host',
 	component: page(() => import('@/pages/instance-info.vue')),
 }, {
diff --git a/packages/frontend/src/style.scss b/packages/frontend/src/style.scss
index 8c5617b72e..f122f47c06 100644
--- a/packages/frontend/src/style.scss
+++ b/packages/frontend/src/style.scss
@@ -113,10 +113,6 @@ a {
 		outline-offset: 2px;
 	}
 
-	&:hover {
-		text-decoration: underline;
-	}
-
 	&[target="_blank"] {
 		-webkit-touch-callout: default;
 	}
@@ -335,13 +331,13 @@ rt {
 ._gaps_m {
 	display: flex;
 	flex-direction: column;
-	gap: 1.5em;
+	gap: 21px;
 }
 
 ._gaps_s {
 	display: flex;
 	flex-direction: column;
-	gap: 0.75em;
+	gap: 10px;
 }
 
 ._gaps {
diff --git a/packages/frontend/src/types/menu.ts b/packages/frontend/src/types/menu.ts
index 5d1fc1fe72..820759ce61 100644
--- a/packages/frontend/src/types/menu.ts
+++ b/packages/frontend/src/types/menu.ts
@@ -15,16 +15,16 @@ export type MenuAction = (ev: MouseEvent) => void;
 
 export type MenuDivider = { type: 'divider' };
 export type MenuNull = undefined;
-export type MenuLabel = { type: 'label', text: string };
-export type MenuLink = { type: 'link', to: string, text: string, icon?: string, indicate?: boolean, avatar?: Misskey.entities.User };
-export type MenuA = { type: 'a', href: string, target?: string, download?: string, text: string, icon?: string, indicate?: boolean };
+export type MenuLabel = { type: 'label', text: string, caption?: string };
+export type MenuLink = { type: 'link', to: string, text: string, caption?: string, icon?: string, indicate?: boolean, avatar?: Misskey.entities.User };
+export type MenuA = { type: 'a', href: string, target?: string, download?: string, text: string, caption?: string, icon?: string, indicate?: boolean };
 export type MenuUser = { type: 'user', user: Misskey.entities.User, active?: boolean, indicate?: boolean, action: MenuAction };
-export type MenuSwitch = { type: 'switch', ref: Ref<boolean>, text: string, icon?: string, disabled?: boolean | Ref<boolean> };
-export type MenuButton = { type?: 'button', text: string, icon?: string, indicate?: boolean, danger?: boolean, active?: boolean | ComputedRef<boolean>, avatar?: Misskey.entities.User; action: MenuAction };
-export type MenuRadio = { type: 'radio', text: string, icon?: string, ref: Ref<MenuRadioOptionsDef[keyof MenuRadioOptionsDef]>, options: MenuRadioOptionsDef, disabled?: boolean | Ref<boolean> };
-export type MenuRadioOption = { type: 'radioOption', text: string, action: MenuAction; active?: boolean | ComputedRef<boolean> };
+export type MenuSwitch = { type: 'switch', ref: Ref<boolean>, text: string, caption?: string, icon?: string, disabled?: boolean | Ref<boolean> };
+export type MenuButton = { type?: 'button', text: string, caption?: string, icon?: string, indicate?: boolean, danger?: boolean, active?: boolean | ComputedRef<boolean>, avatar?: Misskey.entities.User; action: MenuAction };
+export type MenuRadio = { type: 'radio', text: string, caption?: string, icon?: string, ref: Ref<MenuRadioOptionsDef[keyof MenuRadioOptionsDef]>, options: MenuRadioOptionsDef, disabled?: boolean | Ref<boolean> };
+export type MenuRadioOption = { type: 'radioOption', text: string, caption?: string, action: MenuAction; active?: boolean | ComputedRef<boolean> };
 export type MenuComponent<T extends Component = any> = { type: 'component', component: T, props?: ComponentProps<T> };
-export type MenuParent = { type: 'parent', text: string, icon?: string, children: MenuItem[] | (() => Promise<MenuItem[]> | MenuItem[]) };
+export type MenuParent = { type: 'parent', text: string, caption?: string, icon?: string, children: MenuItem[] | (() => Promise<MenuItem[]> | MenuItem[]) };
 
 export type MenuPending = { type: 'pending' };
 
diff --git a/packages/frontend/src/ui/_common_/navbar.vue b/packages/frontend/src/ui/_common_/navbar.vue
index 98d6f329ab..88ce3a96e2 100644
--- a/packages/frontend/src/ui/_common_/navbar.vue
+++ b/packages/frontend/src/ui/_common_/navbar.vue
@@ -65,7 +65,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	</svg>
 	-->
 
-	<div :class="$style.subButtons">
+	<div v-if="!forceIconOnly" :class="$style.subButtons">
 		<div :class="[$style.subButton, $style.menuEditButton]">
 			<svg viewBox="0 0 16 64" :class="$style.subButtonShape">
 				<g transform="matrix(0.333333,0,0,0.222222,0.000895785,21.3333)">
@@ -74,9 +74,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</svg>
 			<button class="_button" :class="$style.subButtonClickable" @click="menuEdit"><i :class="$style.subButtonIcon" class="ti ti-settings-2"></i></button>
 		</div>
-		<div v-if="!forceIconOnly" :class="$style.subButtonGapFill"></div>
-		<div v-if="!forceIconOnly" :class="$style.subButtonGapFillDivider"></div>
-		<div v-if="!forceIconOnly" :class="[$style.subButton, $style.toggleButton]">
+		<div :class="$style.subButtonGapFill"></div>
+		<div :class="$style.subButtonGapFillDivider"></div>
+		<div :class="[$style.subButton, $style.toggleButton]">
 			<svg viewBox="0 0 16 64" :class="$style.subButtonShape">
 				<g transform="matrix(0.333333,0,0,0.222222,0.000895785,21.3333)">
 					<path d="M47.488,7.995C47.79,10.11 47.943,12.266 47.943,14.429C47.997,26.989 47.997,84 47.997,84C47.997,84 44.018,118.246 23.997,133.5C-0.374,152.07 -0.003,192 -0.003,192L-0.003,-96C-0.003,-96 0.151,-56.216 23.997,-37.5C40.861,-24.265 46.043,-1.243 47.488,7.995Z" style="fill:var(--MI_THEME-navBg);"/>
diff --git a/packages/frontend/src/utility/autogen/settings-search-index.ts b/packages/frontend/src/utility/autogen/settings-search-index.ts
index fd92876880..64fe328478 100644
--- a/packages/frontend/src/utility/autogen/settings-search-index.ts
+++ b/packages/frontend/src/utility/autogen/settings-search-index.ts
@@ -240,20 +240,25 @@ export const searchIndexes: SearchIndexItem[] = [
 				keywords: ['explore', i18n.ts.makeExplorableDescription],
 			},
 			{
-				id: '7vr04wKol',
+				id: 'xEYlOghao',
+				label: i18n.ts._chat.chatAllowedUsers,
+				keywords: ['chat'],
+			},
+			{
+				id: 'BnOtlyaAh',
 				children: [
 					{
-						id: 'Av7fAaHv8',
+						id: 'BzMIVBpL0',
 						label: i18n.ts._accountSettings.requireSigninToViewContents,
 						keywords: ['login', 'signin'],
 					},
 					{
-						id: '5RbESWefG',
+						id: 'jJUqPqBAv',
 						label: i18n.ts._accountSettings.makeNotesFollowersOnlyBefore,
 						keywords: ['follower', i18n.ts._accountSettings.makeNotesFollowersOnlyBeforeDescription],
 					},
 					{
-						id: 'hdzwDs3qd',
+						id: 'ra10txIFV',
 						label: i18n.ts._accountSettings.makeNotesHiddenBefore,
 						keywords: ['hidden', i18n.ts._accountSettings.makeNotesHiddenBeforeDescription],
 					},
diff --git a/packages/frontend/src/utility/get-user-menu.ts b/packages/frontend/src/utility/get-user-menu.ts
index de20f2678e..37c88c9665 100644
--- a/packages/frontend/src/utility/get-user-menu.ts
+++ b/packages/frontend/src/utility/get-user-menu.ts
@@ -151,24 +151,6 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 
 	const menuItems: MenuItem[] = [];
 
-	menuItems.push({
-		icon: 'ti ti-at',
-		text: i18n.ts.copyUsername,
-		action: () => {
-			copyToClipboard(`@${user.username}@${user.host ?? host}`);
-		},
-	});
-
-	if (notesSearchAvailable && (user.host == null || canSearchNonLocalNotes)) {
-		menuItems.push({
-			icon: 'ti ti-search',
-			text: i18n.ts.searchThisUsersNotes,
-			action: () => {
-				router.push(`/search?username=${encodeURIComponent(user.username)}${user.host != null ? '&host=' + encodeURIComponent(user.host) : ''}`);
-			},
-		});
-	}
-
 	if (iAmModerator) {
 		menuItems.push({
 			icon: 'ti ti-user-exclamation',
@@ -176,10 +158,27 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 			action: () => {
 				router.push(`/admin/user/${user.id}`);
 			},
-		});
+		}, { type: 'divider' });
 	}
 
 	menuItems.push({
+		icon: 'ti ti-at',
+		text: i18n.ts.copyUsername,
+		action: () => {
+			copyToClipboard(`@${user.username}@${user.host ?? host}`);
+		},
+	});
+
+	menuItems.push({
+		icon: 'ti ti-share',
+		text: i18n.ts.copyProfileUrl,
+		action: () => {
+			const canonical = user.host === null ? `@${user.username}` : `@${user.username}@${toUnicode(user.host)}`;
+			copyToClipboard(`${url}/${canonical}`);
+		},
+	});
+
+	menuItems.push({
 		icon: 'ti ti-rss',
 		text: i18n.ts.copyRSS,
 		action: () => {
@@ -210,24 +209,18 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 		});
 	}
 
-	menuItems.push({
-		icon: 'ti ti-share',
-		text: i18n.ts.copyProfileUrl,
-		action: () => {
-			const canonical = user.host === null ? `@${user.username}` : `@${user.username}@${toUnicode(user.host)}`;
-			copyToClipboard(`${url}/${canonical}`);
-		},
-	});
-
-	if ($i) {
+	if (notesSearchAvailable && (user.host == null || canSearchNonLocalNotes)) {
 		menuItems.push({
-			icon: 'ti ti-mail',
-			text: i18n.ts.sendMessage,
+			icon: 'ti ti-search',
+			text: i18n.ts.searchThisUsersNotes,
 			action: () => {
-				const canonical = user.host === null ? `@${user.username}` : `@${user.username}@${user.host}`;
-				os.post({ specified: user, initialText: `${canonical} ` });
+				router.push(`/search?username=${encodeURIComponent(user.username)}${user.host != null ? '&host=' + encodeURIComponent(user.host) : ''}`);
 			},
-		}, { type: 'divider' }, {
+		});
+	}
+
+	if ($i) {
+		menuItems.push({ type: 'divider' }, {
 			icon: 'ti ti-pencil',
 			text: i18n.ts.editMemo,
 			action: editMemo,
@@ -363,6 +356,18 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 		//}
 
 		menuItems.push({ type: 'divider' }, {
+			icon: 'ti ti-mail',
+			text: i18n.ts.sendMessage,
+			action: () => {
+				const canonical = user.host === null ? `@${user.username}` : `@${user.username}@${user.host}`;
+				os.post({ specified: user, initialText: `${canonical} ` });
+			},
+		}, {
+			type: 'link',
+			icon: 'ti ti-messages',
+			text: i18n.ts._chat.chatWithThisUser,
+			to: `/chat/user/${user.id}`,
+		}, { type: 'divider' }, {
 			icon: user.isMuted ? 'ti ti-eye' : 'ti ti-eye-off',
 			text: user.isMuted ? i18n.ts.unmute : i18n.ts.mute,
 			action: toggleMute,
diff --git a/packages/frontend/src/utility/sound.ts b/packages/frontend/src/utility/sound.ts
index 796af0e5ca..f217bdfcd5 100644
--- a/packages/frontend/src/utility/sound.ts
+++ b/packages/frontend/src/utility/sound.ts
@@ -77,6 +77,7 @@ export const operationTypes = [
 	'note',
 	'notification',
 	'reaction',
+	'chatMessage',
 ] as const;
 
 /** サウンドの種類 */
diff --git a/packages/frontend/src/utility/upload.ts b/packages/frontend/src/utility/upload.ts
index eb3cbd3dfa..e13d793ffb 100644
--- a/packages/frontend/src/utility/upload.ts
+++ b/packages/frontend/src/utility/upload.ts
@@ -32,7 +32,7 @@ const mimeTypeMap = {
 
 export function uploadFile(
 	file: File,
-	folder?: string | Misskey.entities.DriveFolder,
+	folder?: string | Misskey.entities.DriveFolder | null,
 	name?: string,
 	keepOriginal: boolean = prefer.s.keepOriginalUploading,
 ): Promise<Misskey.entities.DriveFile> {