diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f1fdcf9eeddb5d84b260ca4eed40c86ff227913..945b6ac1ad168a76040e8701160d6d4695f78492 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@
 
 ### Client
 - Feat: 新しいゲームを追加
+- Feat: 音声・映像プレイヤーを追加
 - Feat: 絵文字の詳細ダイアログを追加
 - Feat: 枠線をつけるMFM`$[border.width=1,style=solid,color=fff,radius=0 ...]`を追加
 - Enhance: ハッシュタグ入力時に、本文の末尾の行に何も書かれていない場合は新たにスペースを追加しないように
@@ -38,6 +39,7 @@
 - Enhance: 連合先のレートリミットに引っかかった際にリトライするようになりました
 - Enhance: ActivityPub Deliver queueでBodyを事前処理するように (#12916)
 - Enhance: クリップをエクスポートできるように
+- Enhance: `/files`のファイルに対してHTTP Rangeリクエストを行えるように
 - Enhance: `api.json`のOpenAPI Specificationを3.1.0に更新
 - Fix: `drive/files/update`でファイル名のバリデーションが機能していない問題を修正
 - Fix: `notes/create`で、`text`が空白文字のみで構成されているか`null`であって、かつ`text`だけであるリクエストに対するレスポンスが400になるように変更
diff --git a/locales/index.d.ts b/locales/index.d.ts
index dafbdd35595c1a7c6500f02ac6109433034dbfce..71134544d94337a27c1d9cdcc602301f7740f705 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -1061,6 +1061,8 @@ export interface Locale {
     "noteIdOrUrl": string;
     "video": string;
     "videos": string;
+    "audio": string;
+    "audioFiles": string;
     "dataSaver": string;
     "accountMigration": string;
     "accountMoved": string;
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 58952894b37c24a41ec368ea4bbecef4bf4bce73..743a3ca38ea26be1ed13540a1eec82fc7d673e06 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1058,6 +1058,8 @@ limitWidthOfReaction: "リアクションの最大横幅を制限し、縮小し
 noteIdOrUrl: "ノートIDまたはURL"
 video: "å‹•ç”»"
 videos: "å‹•ç”»"
+audio: "音声"
+audioFiles: "音声"
 dataSaver: "データセーバー"
 accountMigration: "アカウントの移行"
 accountMoved: "このユーザーは新しいアカウントに移行しました："
diff --git a/packages/backend/src/server/FileServerService.ts b/packages/backend/src/server/FileServerService.ts
index f59996ce17f5efb1871eeff51ff44284f645dc7e..7745a6cb78b114679521fc3ad4329206bc66fdf8 100644
--- a/packages/backend/src/server/FileServerService.ts
+++ b/packages/backend/src/server/FileServerService.ts
@@ -168,11 +168,35 @@ export class FileServerService {
 				}
 
 				if (!image) {
-					image = {
-						data: fs.createReadStream(file.path),
-						ext: file.ext,
-						type: file.mime,
-					};
+					if (request.headers.range && file.file.size > 0) {
+						const range = request.headers.range as string;
+						const parts = range.replace(/bytes=/, '').split('-');
+						const start = parseInt(parts[0], 10);
+						let end = parts[1] ? parseInt(parts[1], 10) : file.file.size - 1;
+						if (end > file.file.size) {
+							end = file.file.size - 1;
+						}
+						const chunksize = end - start + 1;
+
+						image = {
+							data: fs.createReadStream(file.path, {
+								start,
+								end,
+							}),
+							ext: file.ext,
+							type: file.mime,
+						};
+
+						reply.header('Content-Range', `bytes ${start}-${end}/${file.file.size}`);
+						reply.header('Accept-Ranges', 'bytes');
+						reply.header('Content-Length', chunksize);
+					} else {
+						image = {
+							data: fs.createReadStream(file.path),
+							ext: file.ext,
+							type: file.mime,
+						};
+					}
 				}
 
 				if ('pipe' in image.data && typeof image.data.pipe === 'function') {
@@ -203,11 +227,54 @@ export class FileServerService {
 				reply.header('Content-Type', FILE_TYPE_BROWSERSAFE.includes(file.mime) ? file.mime : 'application/octet-stream');
 				reply.header('Cache-Control', 'max-age=31536000, immutable');
 				reply.header('Content-Disposition', contentDisposition('inline', filename));
+
+				if (request.headers.range && file.file.size > 0) {
+					const range = request.headers.range as string;
+					const parts = range.replace(/bytes=/, '').split('-');
+					const start = parseInt(parts[0], 10);
+					let end = parts[1] ? parseInt(parts[1], 10) : file.file.size - 1;
+					if (end > file.file.size) {
+						end = file.file.size - 1;
+					}
+					const chunksize = end - start + 1;
+					const fileStream = fs.createReadStream(file.path, {
+						start,
+						end,
+					});
+					reply.header('Content-Range', `bytes ${start}-${end}/${file.file.size}`);
+					reply.header('Accept-Ranges', 'bytes');
+					reply.header('Content-Length', chunksize);
+					reply.code(206);
+					return fileStream;
+				}
+
 				return fs.createReadStream(file.path);
 			} else {
 				reply.header('Content-Type', FILE_TYPE_BROWSERSAFE.includes(file.file.type) ? file.file.type : 'application/octet-stream');
 				reply.header('Cache-Control', 'max-age=31536000, immutable');
 				reply.header('Content-Disposition', contentDisposition('inline', file.filename));
+
+				if (request.headers.range && file.file.size > 0) {
+					const range = request.headers.range as string;
+					const parts = range.replace(/bytes=/, '').split('-');
+					const start = parseInt(parts[0], 10);
+					let end = parts[1] ? parseInt(parts[1], 10) : file.file.size - 1;
+					console.log(end);
+					if (end > file.file.size) {
+						end = file.file.size - 1;
+					}
+					const chunksize = end - start + 1;
+					const fileStream = fs.createReadStream(file.path, {
+						start,
+						end,
+					});
+					reply.header('Content-Range', `bytes ${start}-${end}/${file.file.size}`);
+					reply.header('Accept-Ranges', 'bytes');
+					reply.header('Content-Length', chunksize);
+					reply.code(206);
+					return fileStream;
+				}
+
 				return fs.createReadStream(file.path);
 			}
 		} catch (e) {
@@ -340,11 +407,35 @@ export class FileServerService {
 			}
 
 			if (!image) {
-				image = {
-					data: fs.createReadStream(file.path),
-					ext: file.ext,
-					type: file.mime,
-				};
+				if (request.headers.range && file.file && file.file.size > 0) {
+					const range = request.headers.range as string;
+					const parts = range.replace(/bytes=/, '').split('-');
+					const start = parseInt(parts[0], 10);
+					let end = parts[1] ? parseInt(parts[1], 10) : file.file.size - 1;
+					if (end > file.file.size) {
+						end = file.file.size - 1;
+					}
+					const chunksize = end - start + 1;
+
+					image = {
+						data: fs.createReadStream(file.path, {
+							start,
+							end,
+						}),
+						ext: file.ext,
+						type: file.mime,
+					};
+
+					reply.header('Content-Range', `bytes ${start}-${end}/${file.file.size}`);
+					reply.header('Accept-Ranges', 'bytes');
+					reply.header('Content-Length', chunksize);
+				} else {
+					image = {
+						data: fs.createReadStream(file.path),
+						ext: file.ext,
+						type: file.mime,
+					};
+				}
 			}
 
 			if ('cleanup' in file) {
diff --git a/packages/frontend/src/components/MkMediaAudio.vue b/packages/frontend/src/components/MkMediaAudio.vue
new file mode 100644
index 0000000000000000000000000000000000000000..75b31b9a4916927b2c26059222670d1cbd5c49e6
--- /dev/null
+++ b/packages/frontend/src/components/MkMediaAudio.vue
@@ -0,0 +1,363 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div
+	:class="[
+		$style.audioContainer,
+		(audio.isSensitive && defaultStore.state.highlightSensitiveMedia) && $style.sensitive,
+	]"
+	@contextmenu.stop
+>
+	<button v-if="hide" :class="$style.hidden" @click="hide = false">
+		<div :class="$style.hiddenTextWrapper">
+			<b v-if="audio.isSensitive" style="display: block;"><i class="ti ti-eye-exclamation"></i> {{ i18n.ts.sensitive }}{{ defaultStore.state.dataSaver.media ? ` (${i18n.ts.audio}${audio.size ? ' ' + bytes(audio.size) : ''})` : '' }}</b>
+			<b v-else style="display: block;"><i class="ti ti-music"></i> {{ defaultStore.state.dataSaver.media && audio.size ? bytes(audio.size) : i18n.ts.audio }}</b>
+			<span style="display: block;">{{ i18n.ts.clickToShow }}</span>
+		</div>
+	</button>
+	<div v-else :class="$style.audioControls">
+		<audio
+			ref="audioEl"
+			preload="metadata"
+			:class="$style.audio"
+		>
+			<source :src="audio.url">
+		</audio>
+		<div :class="[$style.controlsChild, $style.controlsLeft]">
+			<button class="_button" :class="$style.controlButton" @click="togglePlayPause">
+				<i v-if="isPlaying" class="ti ti-player-pause-filled"></i>
+				<i v-else class="ti ti-player-play-filled"></i>
+			</button>
+		</div>
+		<div :class="[$style.controlsChild, $style.controlsRight]">
+			<button class="_button" :class="$style.controlButton" @click="showMenu">
+				<i class="ti ti-settings"></i>
+			</button>
+		</div>
+		<div :class="[$style.controlsChild, $style.controlsTime]">{{ hms(elapsedTimeMs) }}</div>
+		<div :class="[$style.controlsChild, $style.controlsVolume]">
+			<button class="_button" :class="$style.controlButton" @click="toggleMute">
+				<i v-if="volume === 0" class="ti ti-volume-3"></i>
+				<i v-else class="ti ti-volume"></i>
+			</button>
+			<MkMediaRange
+				v-model="volume"
+				:class="$style.volumeSeekbar"
+			/>
+		</div>
+		<MkMediaRange
+			v-model="rangePercent"
+			:class="$style.seekbarRoot"
+			:buffer="bufferedDataRatio"
+		/>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { shallowRef, watch, computed, ref, onDeactivated, onActivated, onMounted } from 'vue';
+import * as Misskey from 'misskey-js';
+import type { MenuItem } from '@/types/menu.js';
+import { defaultStore } from '@/store.js';
+import { i18n } from '@/i18n.js';
+import * as os from '@/os.js';
+import bytes from '@/filters/bytes.js';
+import { hms } from '@/filters/hms.js';
+import MkMediaRange from '@/components/MkMediaRange.vue';
+import { iAmModerator } from '@/account.js';
+
+const props = defineProps<{
+	audio: Misskey.entities.DriveFile;
+}>();
+
+const audioEl = shallowRef<HTMLAudioElement>();
+
+// eslint-disable-next-line vue/no-setup-props-destructure
+const hide = ref((defaultStore.state.nsfw === 'force' || defaultStore.state.dataSaver.media) ? true : (props.audio.isSensitive && defaultStore.state.nsfw !== 'ignore'));
+
+// Menu
+const menuShowing = ref(false);
+
+function showMenu(ev: MouseEvent) {
+	let menu: MenuItem[] = [];
+
+	menu = [
+		// TODO: 再生キューに追加
+		{
+			text: i18n.ts.hide,
+			icon: 'ti ti-eye-off',
+			action: () => {
+				hide.value = true;
+			},
+		},
+	];
+
+	if (iAmModerator) {
+		menu.push({
+			type: 'divider',
+		}, {
+			text: props.audio.isSensitive ? i18n.ts.unmarkAsSensitive : i18n.ts.markAsSensitive,
+			icon: props.audio.isSensitive ? 'ti ti-eye' : 'ti ti-eye-exclamation',
+			danger: true,
+			action: () => toggleSensitive(props.audio),
+		});
+	}
+
+	menuShowing.value = true;
+	os.popupMenu(menu, ev.currentTarget ?? ev.target, {
+		align: 'right',
+		onClosing: () => {
+			menuShowing.value = false;
+		},
+	});
+}
+
+function toggleSensitive(file: Misskey.entities.DriveFile) {
+	os.apiWithDialog('drive/files/update', {
+		fileId: file.id,
+		isSensitive: !file.isSensitive,
+	});
+}
+
+// MediaControl: Common State
+const oncePlayed = ref(false);
+const isReady = ref(false);
+const isPlaying = ref(false);
+const isActuallyPlaying = ref(false);
+const elapsedTimeMs = ref(0);
+const durationMs = ref(0);
+const rangePercent = computed({
+	get: () => {
+		return (elapsedTimeMs.value / durationMs.value) || 0;
+	},
+	set: (to) => {
+		if (!audioEl.value) return;
+		audioEl.value.currentTime = to * durationMs.value / 1000;
+	},
+});
+const volume = ref(.5);
+const bufferedEnd = ref(0);
+const bufferedDataRatio = computed(() => {
+	if (!audioEl.value) return 0;
+	return bufferedEnd.value / audioEl.value.duration;
+});
+
+// MediaControl Events
+function togglePlayPause() {
+	if (!isReady.value || !audioEl.value) return;
+
+	if (isPlaying.value) {
+		audioEl.value.pause();
+		isPlaying.value = false;
+	} else {
+		audioEl.value.play();
+		isPlaying.value = true;
+		oncePlayed.value = true;
+	}
+}
+
+function toggleMute() {
+	if (volume.value === 0) {
+		volume.value = .5;
+	} else {
+		volume.value = 0;
+	}
+}
+
+let onceInit = false;
+let stopAudioElWatch: () => void;
+
+function init() {
+	if (onceInit) return;
+	onceInit = true;
+
+	stopAudioElWatch = watch(audioEl, () => {
+		if (audioEl.value) {
+			isReady.value = true;
+
+			function updateMediaTick() {
+				if (audioEl.value) {
+					try {
+						bufferedEnd.value = audioEl.value.buffered.end(0);
+					} catch (err) {
+						bufferedEnd.value = 0;
+					}
+
+					elapsedTimeMs.value = audioEl.value.currentTime * 1000;
+				}
+				window.requestAnimationFrame(updateMediaTick);
+			}
+
+			updateMediaTick();
+
+			audioEl.value.addEventListener('play', () => {
+				isActuallyPlaying.value = true;
+			});
+
+			audioEl.value.addEventListener('pause', () => {
+				isActuallyPlaying.value = false;
+				isPlaying.value = false;
+			});
+
+			audioEl.value.addEventListener('ended', () => {
+				oncePlayed.value = false;
+				isActuallyPlaying.value = false;
+				isPlaying.value = false;
+			});
+			
+			durationMs.value = audioEl.value.duration * 1000;
+			audioEl.value.addEventListener('durationchange', () => {
+				if (audioEl.value) {
+					durationMs.value = audioEl.value.duration * 1000;
+				}
+			});
+
+			audioEl.value.volume = volume.value;
+		}
+	}, {
+		immediate: true,
+	});
+}
+
+watch(volume, (to) => {
+	if (audioEl.value) audioEl.value.volume = to;
+});
+
+onMounted(() => {
+	init();
+});
+
+onActivated(() => {
+	init();
+});
+
+onDeactivated(() => {
+	isReady.value = false;
+	isPlaying.value = false;
+	isActuallyPlaying.value = false;
+	elapsedTimeMs.value = 0;
+	durationMs.value = 0;
+	bufferedEnd.value = 0;
+	hide.value = (defaultStore.state.nsfw === 'force' || defaultStore.state.dataSaver.media) ? true : (props.audio.isSensitive && defaultStore.state.nsfw !== 'ignore');
+	stopAudioElWatch();
+	onceInit = false;
+});
+</script>
+
+<style lang="scss" module>
+.audioContainer {
+	container-type: inline-size;
+	position: relative;
+	border: .5px solid var(--divider);
+	border-radius: var(--radius);
+	overflow: clip;
+}
+
+.sensitive {
+	position: relative;
+
+	&::after {
+		content: "";
+		position: absolute;
+		top: 0;
+		left: 0;
+		width: 100%;
+		height: 100%;
+		pointer-events: none;
+		border-radius: inherit;
+		box-shadow: inset 0 0 0 4px var(--warn);
+	}
+}
+
+.hidden {
+	width: 100%;
+	background: none;
+	border: none;
+	outline: none;
+	font: inherit;
+	color: inherit;
+	cursor: pointer;
+	padding: 12px 0;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	background: #000;
+}
+
+.hiddenTextWrapper {
+	text-align: center;
+	font-size: 0.8em;
+	color: #fff;
+}
+
+.audioControls {
+	display: grid;
+	grid-template-areas:
+		"left time . volume right"
+		"seekbar seekbar seekbar seekbar seekbar";
+	grid-template-columns: auto auto 1fr auto auto;
+	align-items: center;
+	gap: 4px 8px;
+	padding: 10px;
+}
+
+.controlsChild {
+	display: flex;
+	align-items: center;
+	gap: 4px;
+
+	.controlButton {
+		padding: 6px;
+		border-radius: calc(var(--radius) / 2);
+		font-size: 1.05rem;
+
+		&:hover {
+			color: var(--accent);
+			background-color: var(--accentedBg);
+		}
+	}
+}
+
+.controlsLeft {
+	grid-area: left;
+}
+
+.controlsRight {
+	grid-area: right;
+}
+
+.controlsTime {
+	grid-area: time;
+	font-size: .9rem;
+}
+
+.controlsVolume {
+	grid-area: volume;
+
+	.volumeSeekbar {
+		display: none;
+	}
+}
+
+.seekbarRoot {
+	grid-area: seekbar;
+}
+
+@container (min-width: 500px) {
+	.audioControls {
+		grid-template-areas: "left seekbar time volume right";
+		grid-template-columns: auto 1fr auto auto auto;
+	}
+
+	.controlsVolume {
+		.volumeSeekbar {
+			max-width: 90px;
+			display: block;
+			flex-grow: 1;
+		}
+	}
+}
+</style>
diff --git a/packages/frontend/src/components/MkMediaBanner.vue b/packages/frontend/src/components/MkMediaBanner.vue
index 3f8fef6632eb54191a323ba4458666df1ffce622..b21960a4900c755198865f0c3b64cf46f6619ec1 100644
--- a/packages/frontend/src/components/MkMediaBanner.vue
+++ b/packages/frontend/src/components/MkMediaBanner.vue
@@ -5,20 +5,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <div :class="$style.root">
-	<div v-if="media.isSensitive && hide" :class="$style.sensitive" @click="hide = false">
+	<MkMediaAudio v-if="media.type.startsWith('audio') && media.type !== 'audio/midi'" :audio="media"/>
+	<div v-else-if="media.isSensitive && hide" :class="$style.sensitive" @click="hide = false">
 		<span style="font-size: 1.6em;"><i class="ti ti-alert-triangle"></i></span>
 		<b>{{ i18n.ts.sensitive }}</b>
 		<span>{{ i18n.ts.clickToShow }}</span>
 	</div>
-	<div v-else-if="media.type.startsWith('audio') && media.type !== 'audio/midi'" :class="$style.audio">
-		<audio
-			ref="audioEl"
-			:src="media.url"
-			:title="media.name"
-			controls
-			preload="metadata"
-		/>
-	</div>
 	<a
 		v-else :class="$style.download"
 		:href="media.url"
@@ -35,6 +27,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { shallowRef, watch, ref } from 'vue';
 import * as Misskey from 'misskey-js';
 import { i18n } from '@/i18n.js';
+import MkMediaAudio from '@/components/MkMediaAudio.vue';
 
 const props = withDefaults(defineProps<{
 	media: Misskey.entities.DriveFile;
diff --git a/packages/frontend/src/components/MkMediaRange.vue b/packages/frontend/src/components/MkMediaRange.vue
new file mode 100644
index 0000000000000000000000000000000000000000..e6303a5c41d12fae03e9d2be484225caf4c33f29
--- /dev/null
+++ b/packages/frontend/src/components/MkMediaRange.vue
@@ -0,0 +1,150 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<!-- Media系専用のinput range -->
+<template>
+<div :class="$style.controlsSeekbar" :style="sliderBgWhite ? '--sliderBg: rgba(255,255,255,.25);' : '--sliderBg: var(--scrollbarHandle);'">
+	<progress v-if="buffer !== undefined" :class="$style.buffer" :value="isNaN(buffer) ? 0 : buffer" min="0" max="1">{{ Math.round(buffer * 100) }}% buffered</progress>
+	<input v-model="model" :class="$style.seek" :style="`--value: ${modelValue * 100}%;`" type="range" min="0" max="1" step="any" @change="emit('dragEnded', modelValue)"/>
+</div>
+</template>
+
+<script setup lang="ts">
+import { computed, ModelRef } from 'vue';
+
+withDefaults(defineProps<{
+	buffer?: number;
+	sliderBgWhite?: boolean;
+}>(), {
+	buffer: undefined,
+	sliderBgWhite: false,
+});
+
+const emit = defineEmits<{
+	(ev: 'dragEnded', value: number): void;
+}>();
+
+// eslint-disable-next-line no-undef
+const model = defineModel({ required: true }) as ModelRef<string | number>;
+const modelValue = computed({
+	get: () => typeof model.value === 'number' ? model.value : parseFloat(model.value),
+	set: v => { model.value = v; },
+});
+</script>
+
+<style lang="scss" module>
+.controlsSeekbar {
+	position: relative;
+}
+
+.seek {
+	position: relative;
+	-webkit-appearance: none;
+	appearance: none;
+	background: transparent;
+	border: 0;
+	border-radius: 26px;
+	color: var(--accent);
+	display: block;
+	height: 19px;
+	margin: 0;
+	min-width: 0;
+	padding: 0;
+	transition: box-shadow .3s ease;
+	width: 100%;
+
+	&::-webkit-slider-runnable-track {
+		background-color: var(--sliderBg);
+		background-image: linear-gradient(to right,currentColor var(--value,0),transparent var(--value,0));
+		border: 0;
+		border-radius: 99rem;
+		height: 5px;
+		transition: box-shadow .3s ease;
+		user-select: none;
+	}
+
+	&::-moz-range-track {
+		background: transparent;
+		border: 0;
+		border-radius: 99rem;
+		height: 5px;
+		transition: box-shadow .3s ease;
+		user-select: none;
+		background-color: var(--sliderBg);
+	}
+
+	&::-webkit-slider-thumb {
+		-webkit-appearance: none;
+		appearance: none;
+		background: #fff;
+		border: 0;
+		border-radius: 100%;
+		box-shadow: 0 1px 1px rgba(35, 40, 47, .15),0 0 0 1px rgba(35, 40, 47, .2);
+		height: 13px;
+		margin-top: -4px;
+		position: relative;
+		transition: all .2s ease;
+		width: 13px;
+
+		&:active {
+			box-shadow: 0 1px 1px rgba(35, 40, 47, .15), 0 0 0 1px rgba(35, 40, 47, .15), 0 0 0 3px rgba(255, 255, 255, .5);
+		}
+	}
+
+	&::-moz-range-thumb {
+		background: #fff;
+		border: 0;
+		border-radius: 100%;
+		box-shadow: 0 1px 1px rgba(35, 40, 47, .15),0 0 0 1px rgba(35, 40, 47, .2);
+		height: 13px;
+		position: relative;
+		transition: all .2s ease;
+		width: 13px;
+
+		&:active {
+			box-shadow: 0 1px 1px rgba(35, 40, 47, .15), 0 0 0 1px rgba(35, 40, 47, .15), 0 0 0 3px rgba(255, 255, 255, .5);
+		}
+	}
+
+	&::-moz-range-progress {
+		background: currentColor;
+		border-radius: 99rem;
+		height: 5px;
+	}
+}
+
+.buffer {
+	appearance: none;
+	background: transparent;
+	color: var(--sliderBg);
+	border: 0;
+	border-radius: 99rem;
+	height: 5px;
+	left: 0;
+	margin-top: -2.5px;
+	padding: 0;
+	position: absolute;
+	top: 50%;
+	width: 100%;
+
+	&::-webkit-progress-bar {
+		background: transparent;
+	}
+
+	&::-webkit-progress-value {
+		background: currentColor;
+		border-radius: 100px;
+		min-width: 5px;
+		transition: width .2s ease;
+	}
+
+	&::-moz-progress-bar {
+		background: currentColor;
+		border-radius: 100px;
+		min-width: 5px;
+		transition: width .2s ease;
+	}
+}
+</style>
diff --git a/packages/frontend/src/components/MkMediaVideo.vue b/packages/frontend/src/components/MkMediaVideo.vue
index f9dba0b15af73574c6aa489a0b410caa65047e2a..977c9020c76d5b7530c88220dfe4d69324426858 100644
--- a/packages/frontend/src/components/MkMediaVideo.vue
+++ b/packages/frontend/src/components/MkMediaVideo.vue
@@ -4,68 +4,345 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div v-if="hide" :class="[$style.hidden, (video.isSensitive && defaultStore.state.highlightSensitiveMedia) && $style.sensitiveContainer]" @click="hide = false">
-	<!-- 【注意】dataSaverMode が有効になっている際には、hide が false になるまでサムネイルや動画を読み込まないようにすること -->
-	<div :class="$style.sensitive">
-		<b v-if="video.isSensitive" style="display: block;"><i class="ti ti-alert-triangle"></i> {{ i18n.ts.sensitive }}{{ defaultStore.state.dataSaver.media ? ` (${i18n.ts.video}${video.size ? ' ' + bytes(video.size) : ''})` : '' }}</b>
-		<b v-else style="display: block;"><i class="ti ti-movie"></i> {{ defaultStore.state.dataSaver.media && video.size ? bytes(video.size) : i18n.ts.video }}</b>
-		<span>{{ i18n.ts.clickToShow }}</span>
-	</div>
-</div>
-<div v-else :class="[$style.visible, (video.isSensitive && defaultStore.state.highlightSensitiveMedia) && $style.sensitiveContainer]">
-	<video
-		ref="videoEl"
-		:class="$style.video"
-		:poster="video.thumbnailUrl"
-		:title="video.comment"
-		:alt="video.comment"
-		preload="none"
-		controls
-		@contextmenu.stop
-	>
-		<source
-			:src="video.url"
+<div
+	ref="playerEl"
+	:class="[
+		$style.videoContainer,
+		controlsShowing && $style.active,
+		(video.isSensitive && defaultStore.state.highlightSensitiveMedia) && $style.sensitive,
+	]"
+	@mouseover="onMouseOver"
+	@mouseleave="onMouseLeave"
+	@contextmenu.stop
+>
+	<button v-if="hide" :class="$style.hidden" @click="hide = false">
+		<div :class="$style.hiddenTextWrapper">
+			<b v-if="video.isSensitive" style="display: block;"><i class="ti ti-eye-exclamation"></i> {{ i18n.ts.sensitive }}{{ defaultStore.state.dataSaver.media ? ` (${i18n.ts.video}${video.size ? ' ' + bytes(video.size) : ''})` : '' }}</b>
+			<b v-else style="display: block;"><i class="ti ti-photo"></i> {{ defaultStore.state.dataSaver.media && video.size ? bytes(video.size) : i18n.ts.video }}</b>
+			<span style="display: block;">{{ i18n.ts.clickToShow }}</span>
+		</div>
+	</button>
+	<div v-else :class="$style.videoRoot" @click.self="togglePlayPause">
+		<video
+			ref="videoEl"
+			:class="$style.video"
+			:poster="video.thumbnailUrl ?? undefined"
+			:title="video.comment ?? undefined"
+			:alt="video.comment"
+			preload="metadata"
+			playsinline
 		>
-	</video>
-	<i class="ti ti-eye-off" :class="$style.hide" @click="hide = true"></i>
+			<source :src="video.url">
+		</video>
+		<button v-if="isReady && !isPlaying" class="_button" :class="$style.videoOverlayPlayButton" @click="togglePlayPause"><i class="ti ti-player-play-filled"></i></button>
+		<div v-else-if="!isActuallyPlaying" :class="$style.videoLoading">
+			<MkLoading/>
+		</div>
+		<i class="ti ti-eye-off" :class="$style.hide" @click="hide = true"></i>
+		<div :class="$style.indicators">
+			<div v-if="video.comment" :class="$style.indicator">ALT</div>
+			<div v-if="video.isSensitive" :class="$style.indicator" style="color: var(--warn);" :title="i18n.ts.sensitive"><i class="ti ti-eye-exclamation"></i></div>
+		</div>
+		<div :class="$style.videoControls" @click.self="togglePlayPause">
+			<div :class="[$style.controlsChild, $style.controlsLeft]">
+				<button class="_button" :class="$style.controlButton" @click="togglePlayPause">
+					<i v-if="isPlaying" class="ti ti-player-pause-filled"></i>
+					<i v-else class="ti ti-player-play-filled"></i>
+				</button>
+			</div>
+			<div :class="[$style.controlsChild, $style.controlsRight]">
+				<button class="_button" :class="$style.controlButton" @click="showMenu">
+					<i class="ti ti-settings"></i>
+				</button>
+				<button class="_button" :class="$style.controlButton" @click="toggleFullscreen">
+					<i v-if="isFullscreen" class="ti ti-arrows-minimize"></i>
+					<i v-else class="ti ti-arrows-maximize"></i>
+				</button>
+			</div>
+			<div :class="[$style.controlsChild, $style.controlsTime]">{{ hms(elapsedTimeMs) }}</div>
+			<div :class="[$style.controlsChild, $style.controlsVolume]">
+				<button class="_button" :class="$style.controlButton" @click="toggleMute">
+					<i v-if="volume === 0" class="ti ti-volume-3"></i>
+					<i v-else class="ti ti-volume"></i>
+				</button>
+				<MkMediaRange
+					v-model="volume"
+					:sliderBgWhite="true"
+					:class="$style.volumeSeekbar"
+				/>
+			</div>
+			<MkMediaRange
+				v-model="rangePercent"
+				:sliderBgWhite="true"
+				:class="$style.seekbarRoot"
+				:buffer="bufferedDataRatio"
+			/>
+		</div>
+	</div>
 </div>
 </template>
 
 <script lang="ts" setup>
-import { ref, shallowRef, watch } from 'vue';
+import { ref, shallowRef, computed, watch, onDeactivated, onActivated, onMounted } from 'vue';
 import * as Misskey from 'misskey-js';
+import type { MenuItem } from '@/types/menu.js';
 import bytes from '@/filters/bytes.js';
+import { hms } from '@/filters/hms.js';
 import { defaultStore } from '@/store.js';
 import { i18n } from '@/i18n.js';
+import * as os from '@/os.js';
+import { isFullscreenNotSupported } from '@/scripts/device-kind.js';
 import hasAudio from '@/scripts/media-has-audio.js';
+import MkMediaRange from '@/components/MkMediaRange.vue';
+import { iAmModerator } from '@/account.js';
 
 const props = defineProps<{
 	video: Misskey.entities.DriveFile;
 }>();
 
+// eslint-disable-next-line vue/no-setup-props-destructure
 const hide = ref((defaultStore.state.nsfw === 'force' || defaultStore.state.dataSaver.media) ? true : (props.video.isSensitive && defaultStore.state.nsfw !== 'ignore'));
 
+// Menu
+const menuShowing = ref(false);
+
+function showMenu(ev: MouseEvent) {
+	let menu: MenuItem[] = [];
+
+	menu = [
+		// TODO: 再生キューに追加
+		{
+			text: i18n.ts.hide,
+			icon: 'ti ti-eye-off',
+			action: () => {
+				hide.value = true;
+			},
+		},
+	];
+
+	if (iAmModerator) {
+		menu.push({
+			type: 'divider',
+		}, {
+			text: props.video.isSensitive ? i18n.ts.unmarkAsSensitive : i18n.ts.markAsSensitive,
+			icon: props.video.isSensitive ? 'ti ti-eye' : 'ti ti-eye-exclamation',
+			danger: true,
+			action: () => toggleSensitive(props.video),
+		});
+	}
+
+	menuShowing.value = true;
+	os.popupMenu(menu, ev.currentTarget ?? ev.target, {
+		align: 'right',
+		onClosing: () => {
+			menuShowing.value = false;
+		},
+	});
+}
+
+function toggleSensitive(file: Misskey.entities.DriveFile) {
+	os.apiWithDialog('drive/files/update', {
+		fileId: file.id,
+		isSensitive: !file.isSensitive,
+	});
+}
+
+// MediaControl: Video State
 const videoEl = shallowRef<HTMLVideoElement>();
+const playerEl = shallowRef<HTMLDivElement>();
+const isHoverring = ref(false);
+const controlsShowing = computed(() => {
+	if (!oncePlayed.value) return true;
+	if (isHoverring.value) return true;
+	if (menuShowing.value) return true;
+	return false;
+});
+const isFullscreen = ref(false);
+let controlStateTimer: string | number;
+
+// MediaControl: Common State
+const oncePlayed = ref(false);
+const isReady = ref(false);
+const isPlaying = ref(false);
+const isActuallyPlaying = ref(false);
+const elapsedTimeMs = ref(0);
+const durationMs = ref(0);
+const rangePercent = computed({
+	get: () => {
+		return (elapsedTimeMs.value / durationMs.value) || 0;
+	},
+	set: (to) => {
+		if (!videoEl.value) return;
+		videoEl.value.currentTime = to * durationMs.value / 1000;
+	},
+});
+const volume = ref(.5);
+const bufferedEnd = ref(0);
+const bufferedDataRatio = computed(() => {
+	if (!videoEl.value) return 0;
+	return bufferedEnd.value / videoEl.value.duration;
+});
+
+// MediaControl Events
+function onMouseOver() {
+	if (controlStateTimer) {
+		clearTimeout(controlStateTimer);
+	}
+	isHoverring.value = true;
+}
+
+function onMouseLeave() {
+	controlStateTimer = window.setTimeout(() => {
+		isHoverring.value = false;
+	}, 100);
+}
+
+function togglePlayPause() {
+	if (!isReady.value || !videoEl.value) return;
+
+	if (isPlaying.value) {
+		videoEl.value.pause();
+		isPlaying.value = false;
+	} else {
+		videoEl.value.play();
+		isPlaying.value = true;
+		oncePlayed.value = true;
+	}
+}
+
+function toggleFullscreen() {
+	if (isFullscreenNotSupported && videoEl.value) {
+		if (isFullscreen.value) {
+			// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+			//@ts-ignore
+			videoEl.value.webkitExitFullscreen();
+			isFullscreen.value = false;
+		} else {
+			// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+			//@ts-ignore
+			videoEl.value.webkitEnterFullscreen();
+			isFullscreen.value = true;
+		}
+	} else if (playerEl.value) {
+		if (isFullscreen.value) {
+			document.exitFullscreen();
+			isFullscreen.value = false;
+		} else {
+			playerEl.value.requestFullscreen({ navigationUI: 'hide' });
+			isFullscreen.value = true;
+		}
+	}
+}
+
+function toggleMute() {
+	if (volume.value === 0) {
+		volume.value = .5;
+	} else {
+		volume.value = 0;
+	}
+}
+
+let onceInit = false;
+let stopVideoElWatch: () => void;
 
-watch(videoEl, () => {
-	if (videoEl.value) {
-		videoEl.value.volume = 0.3;
-		hasAudio(videoEl.value).then(had => {
-			if (!had) {
-				videoEl.value.loop = videoEl.value.muted = true;
-				videoEl.value.play();
+function init() {
+	if (onceInit) return;
+	onceInit = true;
+
+	stopVideoElWatch = watch(videoEl, () => {
+		if (videoEl.value) {
+			isReady.value = true;
+
+			function updateMediaTick() {
+				if (videoEl.value) {
+					try {
+						bufferedEnd.value = videoEl.value.buffered.end(0);
+					} catch (err) {
+						bufferedEnd.value = 0;
+					}
+
+					elapsedTimeMs.value = videoEl.value.currentTime * 1000;
+				}
+				window.requestAnimationFrame(updateMediaTick);
 			}
-		});
+
+			updateMediaTick();
+
+			videoEl.value.addEventListener('play', () => {
+				isActuallyPlaying.value = true;
+			});
+
+			videoEl.value.addEventListener('pause', () => {
+				isActuallyPlaying.value = false;
+				isPlaying.value = false;
+			});
+
+			videoEl.value.addEventListener('ended', () => {
+				oncePlayed.value = false;
+				isActuallyPlaying.value = false;
+				isPlaying.value = false;
+			});
+
+			durationMs.value = videoEl.value.duration * 1000;
+			videoEl.value.addEventListener('durationchange', () => {
+				if (videoEl.value) {
+					durationMs.value = videoEl.value.duration * 1000;
+				}
+			});
+
+			videoEl.value.volume = volume.value;
+			hasAudio(videoEl.value).then(had => {
+				if (!had && videoEl.value) {
+					videoEl.value.loop = videoEl.value.muted = true;
+					videoEl.value.play();
+				}
+			});
+		}
+	}, {
+		immediate: true,
+	});
+}
+
+watch(volume, (to) => {
+	if (videoEl.value) videoEl.value.volume = to;
+});
+
+watch(hide, (to) => {
+	if (to && isFullscreen.value) {
+		document.exitFullscreen();
+		isFullscreen.value = false;
 	}
 });
+
+onMounted(() => {
+	init();
+});
+
+onActivated(() => {
+	init();
+});
+
+onDeactivated(() => {
+	isReady.value = false;
+	isPlaying.value = false;
+	isActuallyPlaying.value = false;
+	elapsedTimeMs.value = 0;
+	durationMs.value = 0;
+	bufferedEnd.value = 0;
+	hide.value = (defaultStore.state.nsfw === 'force' || defaultStore.state.dataSaver.media) ? true : (props.video.isSensitive && defaultStore.state.nsfw !== 'ignore');
+	stopVideoElWatch();
+	onceInit = false;
+});
 </script>
 
 <style lang="scss" module>
-.visible {
+.videoContainer {
+	container-type: inline-size;
 	position: relative;
+	overflow: clip;
 }
 
-.sensitiveContainer {
+.sensitive {
 	position: relative;
 
 	&::after {
@@ -81,44 +358,197 @@ watch(videoEl, () => {
 	}
 }
 
+.indicators {
+	display: inline-flex;
+	position: absolute;
+	top: 10px;
+	left: 10px;
+	pointer-events: none;
+	opacity: .5;
+	gap: 6px;
+}
+
+.indicator {
+	/* Hardcode to black because either --bg or --fg makes it hard to read in dark/light mode */
+	background-color: black;
+	border-radius: 6px;
+	color: var(--accentLighten);
+	display: inline-block;
+	font-weight: bold;
+	font-size: 0.8em;
+	padding: 2px 5px;
+}
+
 .hide {
 	display: block;
 	position: absolute;
 	border-radius: 6px;
 	background-color: var(--fg);
 	color: var(--accentLighten);
-	font-size: 14px;
+	font-size: 12px;
 	opacity: .5;
-	padding: 3px 6px;
+	padding: 5px 8px;
 	text-align: center;
 	cursor: pointer;
 	top: 12px;
 	right: 12px;
 }
 
-.video {
+.hidden {
+	width: 100%;
+	background: none;
+	border: none;
+	outline: none;
+	font: inherit;
+	color: inherit;
+	cursor: pointer;
+	padding: 120px 0;
 	display: flex;
-	justify-content: center;
 	align-items: center;
-	font-size: 3.5em;
-	overflow: hidden;
-	background-position: center;
-	background-size: cover;
+	justify-content: center;
+	background: #000;
+}
+
+.hiddenTextWrapper {
+	text-align: center;
+	font-size: 0.8em;
+	color: #fff;
+}
+
+.videoRoot {
+	background: #000;
+	position: relative;
 	width: 100%;
 	height: 100%;
+	object-fit: contain;
 }
 
-.hidden {
+.video {
+	display: block;
+	height: 100%;
+	width: 100%;
+	pointer-events: none;
+}
+
+.videoOverlayPlayButton {
+	position: absolute;
+	top: 50%;
+	left: 50%;
+	transform: translate(-50%,-50%);
+
+	opacity: 0;
+	transition: opacity .4s ease-in-out;
+
+	background: var(--accent);
+	color: #fff;
+	padding: 1rem;
+	border-radius: 99rem;
+
+	font-size: 1.1rem;
+}
+
+.videoLoading {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
 	display: flex;
+	align-items: center;
 	justify-content: center;
+}
+
+.videoControls {
+	display: grid;
+	grid-template-areas:
+		"left time . volume right"
+		"seekbar seekbar seekbar seekbar seekbar";
+	grid-template-columns: auto auto 1fr auto auto;
 	align-items: center;
-	background: #111;
+	gap: 4px 8px;
+	pointer-events: none;
+
+	padding: 35px 10px 10px 10px;
+	background: linear-gradient(rgba(0, 0, 0, 0),rgba(0, 0, 0, .75));
+
+	position: absolute;
+	left: 0;
+	right: 0;
+	bottom: 0;
+
+	transform: translateY(100%);
+	pointer-events: none;
+	opacity: 0;
+	transition: opacity .4s ease-in-out, transform .4s ease-in-out;
+}
+
+.active {
+	.videoControls {
+		transform: translateY(0);
+		opacity: 1;
+		pointer-events: auto;
+	}
+
+	.videoOverlayPlayButton {
+		opacity: 1;
+	}
+}
+
+.controlsChild {
+	display: flex;
+	align-items: center;
+	gap: 4px;
 	color: #fff;
+
+	.controlButton {
+		padding: 6px;
+		border-radius: calc(var(--radius) / 2);
+		transition: background-color .2s ease-in-out;
+		font-size: 1.05rem;
+
+		&:hover {
+			background-color: var(--accent);
+		}
+	}
 }
 
-.sensitive {
-	display: table-cell;
-	text-align: center;
-	font-size: 12px;
+.controlsLeft {
+	grid-area: left;
+}
+
+.controlsRight {
+	grid-area: right;
+}
+
+.controlsTime {
+	grid-area: time;
+	font-size: .9rem;
+}
+
+.controlsVolume {
+	grid-area: volume;
+
+	.volumeSeekbar {
+		display: none;
+	}
+}
+
+.seekbarRoot {
+	grid-area: seekbar;
+}
+
+@container (min-width: 500px) {
+	.videoControls {
+		grid-template-areas: "left seekbar time volume right";
+		grid-template-columns: auto 1fr auto auto auto;
+	}
+
+	.controlsVolume {
+		.volumeSeekbar {
+			max-width: 90px;
+			display: block;
+			flex-grow: 1;
+		}
+	}
 }
 </style>
diff --git a/packages/frontend/src/filters/hms.ts b/packages/frontend/src/filters/hms.ts
new file mode 100644
index 0000000000000000000000000000000000000000..7b5da965ff6d4237785dcf914663af462a2de253
--- /dev/null
+++ b/packages/frontend/src/filters/hms.ts
@@ -0,0 +1,65 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { i18n } from '@/i18n.js';
+
+export function hms(ms: number, options: {
+	textFormat?: 'colon' | 'locale';
+	enableSeconds?: boolean;
+	enableMs?: boolean;
+}) {
+	const _options = {
+		textFormat: 'colon',
+		enableSeconds: true,
+		enableMs: false,
+		...options,
+	};
+
+	const res: {
+		h?: string;
+		m?: string;
+		s?: string;
+		ms?: string;
+	} = {};
+
+	// ミリ秒を秒に変換
+	let seconds = Math.floor(ms / 1000);
+
+	// 小数点以下の値（２位まで）
+	const mili = ms - seconds * 1000;
+
+	// 時間を計算
+	const hours = Math.floor(seconds / 3600);
+	res.h = format(hours);
+	seconds %= 3600;
+
+	// 分を計算
+	const minutes = Math.floor(seconds / 60);
+	res.m = format(minutes);
+	seconds %= 60;
+
+	// 残った秒数を取得
+	seconds = seconds % 60;
+	res.s = format(seconds);
+
+	// ミリ秒を取得
+	res.ms = format(Math.floor(mili / 10));
+
+	// 結果を返す
+	if (_options.textFormat === 'locale') {
+		res.h += i18n.ts._time.hour;
+		res.m += i18n.ts._time.minute;
+		res.s += i18n.ts._time.second;
+	}
+	return [
+		res.h.startsWith('00') ? undefined : res.h,
+		res.m,
+		(_options.enableSeconds ? res.s : undefined),
+	].filter(v => v !== undefined).join(_options.textFormat === 'colon' ? ':' : ' ') + (_options.enableMs ? _options.textFormat === 'colon' ? `.${res.ms}` : ` ${res.ms}` : '');
+}
+
+function format(n: number) {
+	return n.toString().padStart(2, '0');
+}
diff --git a/packages/frontend/src/scripts/device-kind.ts b/packages/frontend/src/scripts/device-kind.ts
index 3843052a2430745d301c478208d2d8c840f6d9bf..218eb718b109393158d4d977482a6b12e3ac8815 100644
--- a/packages/frontend/src/scripts/device-kind.ts
+++ b/packages/frontend/src/scripts/device-kind.ts
@@ -11,6 +11,13 @@ const ua = navigator.userAgent.toLowerCase();
 const isTablet = /ipad/.test(ua) || (/mobile|iphone|android/.test(ua) && window.innerWidth > 700);
 const isSmartphone = !isTablet && /mobile|iphone|android/.test(ua);
 
+const isIPhone = /iphone|ipod/gi.test(ua) && navigator.maxTouchPoints > 1;
+// navigator.platform may be deprecated but this check is still required
+const isIPadOS = navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1;
+const isIos = /ipad|iphone|ipod/gi.test(ua) && navigator.maxTouchPoints > 1;
+
+export const isFullscreenNotSupported = isIPhone || isIos;
+
 export const deviceKind: 'smartphone' | 'tablet' | 'desktop' = defaultStore.state.overridedDeviceKind ? defaultStore.state.overridedDeviceKind
 	: isSmartphone ? 'smartphone'
 	: isTablet ? 'tablet'