diff --git a/CHANGELOG.md b/CHANGELOG.md
index 513338e66..010d5aed7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@
 ### General
 - Enhance: サーバーごとにモデレーションノートを残せるように
 - Enhance: コンディショナルロールの条件に「マニュアルロールへのアサイン」を追加
+- Enhance: 通知の受信設定に「フォロー中またはフォロワー」を追加
 
 ### Client
 - Enhance: ノート作成画面のファイル添付メニューの区切り線の位置を調整
@@ -33,6 +34,7 @@
   - 必須パラメータを`id`または`name`のいずれかのみに
   - `id`の代わりに`name`で絵文字を指定可能に（`id`・`name`両指定時は従来通り`name`を変更する挙動）
   - `category`および`licence`が指定なしの時勝手にnullに上書きされる挙動を修正
+- Fix: 通知の受信設定で「相互フォロー」が正しく動作しない問題を修正
 
 ## 2024.2.0
 
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 7d5f8ce73..3edc9d235 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -4656,6 +4656,10 @@ export interface Locale extends ILocale {
      * 相互フォロー
      */
     "mutualFollow": string;
+    /**
+     * フォロー中またはフォロワー
+     */
+    "followingOrFollower": string;
     /**
      * ファイル付きのみ
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 1bb56738c..66ddf6a46 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1160,6 +1160,7 @@ showRenotes: "リノートを表示"
 edited: "編集済み"
 notificationRecieveConfig: "通知の受信設定"
 mutualFollow: "相互フォロー"
+followingOrFollower: "フォロー中またはフォロワー"
 fileAttachedOnly: "ファイル付きのみ"
 showRepliesToOthersInTimeline: "TLに他の人への返信を含める"
 hideRepliesToOthersInTimeline: "TLに他の人への返信を含めない"
diff --git a/packages/backend/src/core/NotificationService.ts b/packages/backend/src/core/NotificationService.ts
index ee1619357..722434199 100644
--- a/packages/backend/src/core/NotificationService.ts
+++ b/packages/backend/src/core/NotificationService.ts
@@ -122,6 +122,14 @@ export class NotificationService implements OnApplicationShutdown {
 					return null;
 				}
 			} else if (recieveConfig?.type === 'mutualFollow') {
+				const [isFollowing, isFollower] = await Promise.all([
+					this.cacheService.userFollowingsCache.fetch(notifieeId).then(followings => Object.hasOwn(followings, notifierId)),
+					this.cacheService.userFollowingsCache.fetch(notifierId).then(followings => Object.hasOwn(followings, notifieeId)),
+				]);
+				if (!(isFollowing && isFollower)) {
+					return null;
+				}
+			} else if (recieveConfig?.type === 'followingOrFollower') {
 				const [isFollowing, isFollower] = await Promise.all([
 					this.cacheService.userFollowingsCache.fetch(notifieeId).then(followings => Object.hasOwn(followings, notifierId)),
 					this.cacheService.userFollowingsCache.fetch(notifierId).then(followings => Object.hasOwn(followings, notifieeId)),
diff --git a/packages/backend/src/models/UserProfile.ts b/packages/backend/src/models/UserProfile.ts
index 1ca2f5585..7dbe0b371 100644
--- a/packages/backend/src/models/UserProfile.ts
+++ b/packages/backend/src/models/UserProfile.ts
@@ -249,6 +249,8 @@ export class MiUserProfile {
 			type: 'follower';
 		} | {
 			type: 'mutualFollow';
+		} | {
+			type: 'followingOrFollower';
 		} | {
 			type: 'list';
 			userListId: MiUserList['id'];
diff --git a/packages/backend/src/models/json-schema/user.ts b/packages/backend/src/models/json-schema/user.ts
index 952cd6bf8..947a9317d 100644
--- a/packages/backend/src/models/json-schema/user.ts
+++ b/packages/backend/src/models/json-schema/user.ts
@@ -13,7 +13,7 @@ export const notificationRecieveConfig = {
 				type: {
 					type: 'string',
 					nullable: false,
-					enum: ['all', 'following', 'follower', 'mutualFollow', 'never'],
+					enum: ['all', 'following', 'follower', 'mutualFollow', 'followingOrFollower', 'never'],
 				},
 			},
 			required: ['type'],
diff --git a/packages/frontend/src/pages/settings/notifications.notification-config.vue b/packages/frontend/src/pages/settings/notifications.notification-config.vue
index d6aac6367..a36f03630 100644
--- a/packages/frontend/src/pages/settings/notifications.notification-config.vue
+++ b/packages/frontend/src/pages/settings/notifications.notification-config.vue
@@ -10,6 +10,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<option value="following">{{ i18n.ts.following }}</option>
 		<option value="follower">{{ i18n.ts.followers }}</option>
 		<option value="mutualFollow">{{ i18n.ts.mutualFollow }}</option>
+		<option value="followingOrFollower">{{ i18n.ts.followingOrFollower }}</option>
 		<option value="list">{{ i18n.ts.userList }}</option>
 		<option value="never">{{ i18n.ts.none }}</option>
 	</MkSelect>
diff --git a/packages/frontend/src/pages/settings/notifications.vue b/packages/frontend/src/pages/settings/notifications.vue
index febcfa32e..bbcef6528 100644
--- a/packages/frontend/src/pages/settings/notifications.vue
+++ b/packages/frontend/src/pages/settings/notifications.vue
@@ -16,6 +16,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						$i.notificationRecieveConfig[type]?.type === 'following' ? i18n.ts.following :
 						$i.notificationRecieveConfig[type]?.type === 'follower' ? i18n.ts.followers :
 						$i.notificationRecieveConfig[type]?.type === 'mutualFollow' ? i18n.ts.mutualFollow :
+						$i.notificationRecieveConfig[type]?.type === 'followingOrFollower' ? i18n.ts.followingOrFollower :
 						$i.notificationRecieveConfig[type]?.type === 'list' ? i18n.ts.userList :
 						i18n.ts.all
 					}}
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 8d700fb82..a3597e463 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -3700,7 +3700,7 @@ export type components = {
       notificationRecieveConfig: {
         note?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3709,7 +3709,7 @@ export type components = {
         }]>;
         follow?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3718,7 +3718,7 @@ export type components = {
         }]>;
         mention?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3727,7 +3727,7 @@ export type components = {
         }]>;
         reply?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3736,7 +3736,7 @@ export type components = {
         }]>;
         renote?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3745,7 +3745,7 @@ export type components = {
         }]>;
         quote?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3754,7 +3754,7 @@ export type components = {
         }]>;
         reaction?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3763,7 +3763,7 @@ export type components = {
         }]>;
         pollEnded?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3772,7 +3772,7 @@ export type components = {
         }]>;
         receiveFollowRequest?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3781,7 +3781,7 @@ export type components = {
         }]>;
         followRequestAccepted?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3790,7 +3790,7 @@ export type components = {
         }]>;
         roleAssigned?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3799,7 +3799,7 @@ export type components = {
         }]>;
         achievementEarned?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3808,7 +3808,7 @@ export type components = {
         }]>;
         app?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -3817,7 +3817,7 @@ export type components = {
         }]>;
         test?: OneOf<[{
           /** @enum {string} */
-          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+          type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
         }, {
           /** @enum {string} */
           type: 'list';
@@ -8436,7 +8436,7 @@ export type operations = {
             notificationRecieveConfig: {
               note?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8445,7 +8445,7 @@ export type operations = {
               }]>;
               follow?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8454,7 +8454,7 @@ export type operations = {
               }]>;
               mention?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8463,7 +8463,7 @@ export type operations = {
               }]>;
               reply?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8472,7 +8472,7 @@ export type operations = {
               }]>;
               renote?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8481,7 +8481,7 @@ export type operations = {
               }]>;
               quote?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8490,7 +8490,7 @@ export type operations = {
               }]>;
               reaction?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8499,7 +8499,7 @@ export type operations = {
               }]>;
               pollEnded?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8508,7 +8508,7 @@ export type operations = {
               }]>;
               receiveFollowRequest?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8517,7 +8517,7 @@ export type operations = {
               }]>;
               followRequestAccepted?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8526,7 +8526,7 @@ export type operations = {
               }]>;
               roleAssigned?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8535,7 +8535,7 @@ export type operations = {
               }]>;
               achievementEarned?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8544,7 +8544,7 @@ export type operations = {
               }]>;
               app?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -8553,7 +8553,7 @@ export type operations = {
               }]>;
               test?: OneOf<[{
                 /** @enum {string} */
-                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+                type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
               }, {
                 /** @enum {string} */
                 type: 'list';
@@ -18787,7 +18787,7 @@ export type operations = {
           notificationRecieveConfig?: {
             note?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18796,7 +18796,7 @@ export type operations = {
             }]>;
             follow?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18805,7 +18805,7 @@ export type operations = {
             }]>;
             mention?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18814,7 +18814,7 @@ export type operations = {
             }]>;
             reply?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18823,7 +18823,7 @@ export type operations = {
             }]>;
             renote?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18832,7 +18832,7 @@ export type operations = {
             }]>;
             quote?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18841,7 +18841,7 @@ export type operations = {
             }]>;
             reaction?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18850,7 +18850,7 @@ export type operations = {
             }]>;
             pollEnded?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18859,7 +18859,7 @@ export type operations = {
             }]>;
             receiveFollowRequest?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18868,7 +18868,7 @@ export type operations = {
             }]>;
             followRequestAccepted?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18877,7 +18877,7 @@ export type operations = {
             }]>;
             roleAssigned?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18886,7 +18886,7 @@ export type operations = {
             }]>;
             achievementEarned?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18895,7 +18895,7 @@ export type operations = {
             }]>;
             app?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';
@@ -18904,7 +18904,7 @@ export type operations = {
             }]>;
             test?: OneOf<[{
               /** @enum {string} */
-              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'never';
+              type: 'all' | 'following' | 'follower' | 'mutualFollow' | 'followingOrFollower' | 'never';
             }, {
               /** @enum {string} */
               type: 'list';