diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 83290b310e..fcc17ace1e 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -502,18 +502,6 @@ export class NoteCreateService implements OnApplicationShutdown {
 			});
 		}
 
-		// Channel
-		if (note.channelId) {
-			this.channelFollowingsRepository.findBy({ followeeId: note.channelId }).then(followings => {
-				for (const following of followings) {
-					this.noteReadService.insertNoteUnread(following.followerId, note, {
-						isSpecified: false,
-						isMentioned: false,
-					});
-				}
-			});
-		}
-
 		if (data.reply) {
 			this.saveReply(data.reply, note);
 		}
diff --git a/packages/backend/src/core/NoteReadService.ts b/packages/backend/src/core/NoteReadService.ts
index 7c6808fbd0..1129bd159c 100644
--- a/packages/backend/src/core/NoteReadService.ts
+++ b/packages/backend/src/core/NoteReadService.ts
@@ -1,28 +1,20 @@
 import { setTimeout } from 'node:timers/promises';
 import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
-import { In, IsNull, Not } from 'typeorm';
+import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
 import type { User } from '@/models/entities/User.js';
-import type { Channel } from '@/models/entities/Channel.js';
 import type { Packed } from '@/misc/json-schema.js';
 import type { Note } from '@/models/entities/Note.js';
 import { IdService } from '@/core/IdService.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
-import type { UsersRepository, NoteUnreadsRepository, MutingsRepository, NoteThreadMutingsRepository, FollowingsRepository, ChannelFollowingsRepository } from '@/models/index.js';
-import { UserEntityService } from '@/core/entities/UserEntityService.js';
+import type { NoteUnreadsRepository, MutingsRepository, NoteThreadMutingsRepository } from '@/models/index.js';
 import { bindThis } from '@/decorators.js';
-import { NotificationService } from './NotificationService.js';
-import { AntennaService } from './AntennaService.js';
-import { PushNotificationService } from './PushNotificationService.js';
 
 @Injectable()
 export class NoteReadService implements OnApplicationShutdown {
 	#shutdownController = new AbortController();
 
 	constructor(
-		@Inject(DI.usersRepository)
-		private usersRepository: UsersRepository,
-
 		@Inject(DI.noteUnreadsRepository)
 		private noteUnreadsRepository: NoteUnreadsRepository,
 
@@ -32,18 +24,8 @@ export class NoteReadService implements OnApplicationShutdown {
 		@Inject(DI.noteThreadMutingsRepository)
 		private noteThreadMutingsRepository: NoteThreadMutingsRepository,
 
-		@Inject(DI.followingsRepository)
-		private followingsRepository: FollowingsRepository,
-
-		@Inject(DI.channelFollowingsRepository)
-		private channelFollowingsRepository: ChannelFollowingsRepository,
-
-		private userEntityService: UserEntityService,
 		private idService: IdService,
 		private globalEventService: GlobalEventService,
-		private notificationService: NotificationService,
-		private antennaService: AntennaService,
-		private pushNotificationService: PushNotificationService,
 	) {
 	}
 
@@ -54,7 +36,6 @@ export class NoteReadService implements OnApplicationShutdown {
 		isMentioned: boolean;
 	}): Promise<void> {
 		//#region ミュートしているなら無視
-		// TODO: 現在の仕様ではChannelにミュートは適用されないのでよしなにケアする
 		const mute = await this.mutingsRepository.findBy({
 			muterId: userId,
 		});
@@ -74,7 +55,6 @@ export class NoteReadService implements OnApplicationShutdown {
 			userId: userId,
 			isSpecified: params.isSpecified,
 			isMentioned: params.isMentioned,
-			noteChannelId: note.channelId,
 			noteUserId: note.userId,
 		};
 
@@ -92,9 +72,6 @@ export class NoteReadService implements OnApplicationShutdown {
 			if (params.isSpecified) {
 				this.globalEventService.publishMainStream(userId, 'unreadSpecifiedNote', note.id);
 			}
-			if (note.channelId) {
-				this.globalEventService.publishMainStream(userId, 'unreadChannel', note.id);
-			}
 		}, () => { /* aborted, ignore it */ });
 	}
 
@@ -102,22 +79,9 @@ export class NoteReadService implements OnApplicationShutdown {
 	public async read(
 		userId: User['id'],
 		notes: (Note | Packed<'Note'>)[],
-		info?: {
-			following: Set<User['id']>;
-			followingChannels: Set<Channel['id']>;
-		},
 	): Promise<void> {
-		const followingChannels = info?.followingChannels ? info.followingChannels : new Set<string>((await this.channelFollowingsRepository.find({
-			where: {
-				followerId: userId,
-			},
-			select: ['followeeId'],
-		})).map(x => x.followeeId));
-
-		const myAntennas = (await this.antennaService.getAntennas()).filter(a => a.userId === userId);
 		const readMentions: (Note | Packed<'Note'>)[] = [];
 		const readSpecifiedNotes: (Note | Packed<'Note'>)[] = [];
-		const readChannelNotes: (Note | Packed<'Note'>)[] = [];
 
 		for (const note of notes) {
 			if (note.mentions && note.mentions.includes(userId)) {
@@ -125,17 +89,13 @@ export class NoteReadService implements OnApplicationShutdown {
 			} else if (note.visibleUserIds && note.visibleUserIds.includes(userId)) {
 				readSpecifiedNotes.push(note);
 			}
-
-			if (note.channelId && followingChannels.has(note.channelId)) {
-				readChannelNotes.push(note);
-			}
 		}
 
-		if ((readMentions.length > 0) || (readSpecifiedNotes.length > 0) || (readChannelNotes.length > 0)) {
+		if ((readMentions.length > 0) || (readSpecifiedNotes.length > 0)) {
 			// Remove the record
 			await this.noteUnreadsRepository.delete({
 				userId: userId,
-				noteId: In([...readMentions.map(n => n.id), ...readSpecifiedNotes.map(n => n.id), ...readChannelNotes.map(n => n.id)]),
+				noteId: In([...readMentions.map(n => n.id), ...readSpecifiedNotes.map(n => n.id)]),
 			});
 
 			// TODO: ↓まとめてクエリしたい
@@ -159,16 +119,6 @@ export class NoteReadService implements OnApplicationShutdown {
 					this.globalEventService.publishMainStream(userId, 'readAllUnreadSpecifiedNotes');
 				}
 			});
-	
-			this.noteUnreadsRepository.countBy({
-				userId: userId,
-				noteChannelId: Not(IsNull()),
-			}).then(channelNoteCount => {
-				if (channelNoteCount === 0) {
-					// 全て既読になったイベントを発行
-					this.globalEventService.publishMainStream(userId, 'readAllChannels');
-				}
-			});
 		}
 	}
 
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index e8474c7e0e..f2f5e4b582 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -234,18 +234,6 @@ export class UserEntityService implements OnModuleInit {
 		return false; // TODO
 	}
 
-	@bindThis
-	public async getHasUnreadChannel(userId: User['id']): Promise<boolean> {
-		const channels = await this.channelFollowingsRepository.findBy({ followerId: userId });
-
-		const unread = channels.length > 0 ? await this.noteUnreadsRepository.findOneBy({
-			userId: userId,
-			noteChannelId: In(channels.map(x => x.followeeId)),
-		}) : null;
-
-		return unread != null;
-	}
-
 	@bindThis
 	public async getHasUnreadNotification(userId: User['id']): Promise<boolean> {
 		const latestReadNotificationId = await this.redisClient.get(`latestReadNotification:${userId}`);
@@ -463,7 +451,7 @@ export class UserEntityService implements OnModuleInit {
 				}).then(count => count > 0),
 				hasUnreadAnnouncement: this.getHasUnreadAnnouncement(user.id),
 				hasUnreadAntenna: this.getHasUnreadAntenna(user.id),
-				hasUnreadChannel: this.getHasUnreadChannel(user.id),
+				hasUnreadChannel: false, // 後方互換性のため
 				hasUnreadNotification: this.getHasUnreadNotification(user.id),
 				hasPendingReceivedFollowRequest: this.getHasPendingReceivedFollowRequest(user.id),
 				mutedWords: profile!.mutedWords,
diff --git a/packages/backend/src/models/json-schema/user.ts b/packages/backend/src/models/json-schema/user.ts
index e8a7212c52..e388a77a5e 100644
--- a/packages/backend/src/models/json-schema/user.ts
+++ b/packages/backend/src/models/json-schema/user.ts
@@ -311,10 +311,6 @@ export const packedMeDetailedOnlySchema = {
 			type: 'boolean',
 			nullable: false, optional: false,
 		},
-		hasUnreadChannel: {
-			type: 'boolean',
-			nullable: false, optional: false,
-		},
 		hasUnreadNotification: {
 			type: 'boolean',
 			nullable: false, optional: false,
diff --git a/packages/backend/src/server/api/stream/index.ts b/packages/backend/src/server/api/stream/index.ts
index f1f8bfd3a2..2f473cd012 100644
--- a/packages/backend/src/server/api/stream/index.ts
+++ b/packages/backend/src/server/api/stream/index.ts
@@ -186,10 +186,7 @@ export default class Connection {
 		if (note == null) return;
 
 		if (this.user && (note.userId !== this.user.id)) {
-			this.noteReadService.read(this.user.id, [note], {
-				following: this.following,
-				followingChannels: this.followingChannels,
-			});
+			this.noteReadService.read(this.user.id, [note]);
 		}
 	}
 
diff --git a/packages/backend/src/server/api/stream/types.ts b/packages/backend/src/server/api/stream/types.ts
index 1e6e51e76d..f4eedc3964 100644
--- a/packages/backend/src/server/api/stream/types.ts
+++ b/packages/backend/src/server/api/stream/types.ts
@@ -97,8 +97,6 @@ export interface MainStreamTypes {
 	readAllAntennas: undefined;
 	unreadAntenna: Antenna;
 	readAllAnnouncements: undefined;
-	readAllChannels: undefined;
-	unreadChannel: Note['id'];
 	myTokenRegenerated: undefined;
 	signin: Signin;
 	registryUpdated: {
diff --git a/packages/frontend/src/init.ts b/packages/frontend/src/init.ts
index 26c5adfc70..7809017951 100644
--- a/packages/frontend/src/init.ts
+++ b/packages/frontend/src/init.ts
@@ -513,15 +513,6 @@ if ($i) {
 		updateAccount({ hasUnreadAnnouncement: false });
 	});
 
-	main.on('readAllChannels', () => {
-		updateAccount({ hasUnreadChannel: false });
-	});
-
-	main.on('unreadChannel', () => {
-		updateAccount({ hasUnreadChannel: true });
-		sound.play('channel');
-	});
-
 	// トークンが再生成されたとき
 	// このままではMisskeyが利用できないので強制的にサインアウトさせる
 	main.on('myTokenRegenerated', () => {
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index 37a8bc6184..7343fd74ad 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -88,7 +88,6 @@ export type MeDetailed = UserDetailed & {
 	hasPendingReceivedFollowRequest: boolean;
 	hasUnreadAnnouncement: boolean;
 	hasUnreadAntenna: boolean;
-	hasUnreadChannel: boolean;
 	hasUnreadMentions: boolean;
 	hasUnreadMessagingMessage: boolean;
 	hasUnreadNotification: boolean;
diff --git a/packages/misskey-js/src/streaming.types.ts b/packages/misskey-js/src/streaming.types.ts
index a64545f8e2..96ac7787e1 100644
--- a/packages/misskey-js/src/streaming.types.ts
+++ b/packages/misskey-js/src/streaming.types.ts
@@ -28,8 +28,6 @@ export type Channels = {
 			readAllAntennas: () => void;
 			unreadAntenna: (payload: Antenna) => void;
 			readAllAnnouncements: () => void;
-			readAllChannels: () => void;
-			unreadChannel: (payload: Note['id']) => void;
 			myTokenRegenerated: () => void;
 			reversiNoInvites: () => void;
 			reversiInvited: (payload: FIXME) => void;