diff --git a/packages/backend/src/core/CustomEmojiService.ts b/packages/backend/src/core/CustomEmojiService.ts
index a62854c61..1c3b60e5d 100644
--- a/packages/backend/src/core/CustomEmojiService.ts
+++ b/packages/backend/src/core/CustomEmojiService.ts
@@ -8,7 +8,7 @@ import type { DriveFile } from '@/models/entities/DriveFile.js';
 import type { Emoji } from '@/models/entities/Emoji.js';
 import type { EmojisRepository, Note } from '@/models/index.js';
 import { bindThis } from '@/decorators.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import type { Config } from '@/config.js';
 import { ReactionService } from '@/core/ReactionService.js';
@@ -16,7 +16,7 @@ import { query } from '@/misc/prelude/url.js';
 
 @Injectable()
 export class CustomEmojiService {
-	private cache: KVCache<Emoji | null>;
+	private cache: MemoryKVCache<Emoji | null>;
 
 	constructor(
 		@Inject(DI.config)
@@ -34,7 +34,7 @@ export class CustomEmojiService {
 		private globalEventService: GlobalEventService,
 		private reactionService: ReactionService,
 	) {
-		this.cache = new KVCache<Emoji | null>(1000 * 60 * 60 * 12);
+		this.cache = new MemoryKVCache<Emoji | null>(1000 * 60 * 60 * 12);
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/FederatedInstanceService.ts b/packages/backend/src/core/FederatedInstanceService.ts
index b85791e43..2c6d3ac50 100644
--- a/packages/backend/src/core/FederatedInstanceService.ts
+++ b/packages/backend/src/core/FederatedInstanceService.ts
@@ -1,7 +1,7 @@
 import { Inject, Injectable } from '@nestjs/common';
 import type { InstancesRepository } from '@/models/index.js';
 import type { Instance } from '@/models/entities/Instance.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import { IdService } from '@/core/IdService.js';
 import { DI } from '@/di-symbols.js';
 import { UtilityService } from '@/core/UtilityService.js';
@@ -9,7 +9,7 @@ import { bindThis } from '@/decorators.js';
 
 @Injectable()
 export class FederatedInstanceService {
-	private cache: KVCache<Instance>;
+	private cache: MemoryKVCache<Instance>;
 
 	constructor(
 		@Inject(DI.instancesRepository)
@@ -18,7 +18,7 @@ export class FederatedInstanceService {
 		private utilityService: UtilityService,
 		private idService: IdService,
 	) {
-		this.cache = new KVCache<Instance>(1000 * 60 * 60);
+		this.cache = new MemoryKVCache<Instance>(1000 * 60 * 60);
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/InstanceActorService.ts b/packages/backend/src/core/InstanceActorService.ts
index ef87051a7..049e27dec 100644
--- a/packages/backend/src/core/InstanceActorService.ts
+++ b/packages/backend/src/core/InstanceActorService.ts
@@ -2,7 +2,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import { IsNull } from 'typeorm';
 import type { LocalUser } from '@/models/entities/User.js';
 import type { UsersRepository } from '@/models/index.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import { DI } from '@/di-symbols.js';
 import { CreateSystemUserService } from '@/core/CreateSystemUserService.js';
 import { bindThis } from '@/decorators.js';
@@ -11,7 +11,7 @@ const ACTOR_USERNAME = 'instance.actor' as const;
 
 @Injectable()
 export class InstanceActorService {
-	private cache: KVCache<LocalUser>;
+	private cache: MemoryKVCache<LocalUser>;
 
 	constructor(
 		@Inject(DI.usersRepository)
@@ -19,7 +19,7 @@ export class InstanceActorService {
 
 		private createSystemUserService: CreateSystemUserService,
 	) {
-		this.cache = new KVCache<LocalUser>(Infinity);
+		this.cache = new MemoryKVCache<LocalUser>(Infinity);
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 7af709943..552f24104 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -20,7 +20,7 @@ import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js
 import { checkWordMute } from '@/misc/check-word-mute.js';
 import type { Channel } from '@/models/entities/Channel.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { UserProfile } from '@/models/entities/UserProfile.js';
 import { RelayService } from '@/core/RelayService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
@@ -47,7 +47,7 @@ import { DB_MAX_NOTE_TEXT_LENGTH } from '@/const.js';
 import { RoleService } from '@/core/RoleService.js';
 import { MetaService } from '@/core/MetaService.js';
 
-const mutedWordsCache = new KVCache<{ userId: UserProfile['userId']; mutedWords: UserProfile['mutedWords']; }[]>(1000 * 60 * 5);
+const mutedWordsCache = new MemoryKVCache<{ userId: UserProfile['userId']; mutedWords: UserProfile['mutedWords']; }[]>(1000 * 60 * 5);
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
 
diff --git a/packages/backend/src/core/RelayService.ts b/packages/backend/src/core/RelayService.ts
index 4537f1b81..be5a4d4b0 100644
--- a/packages/backend/src/core/RelayService.ts
+++ b/packages/backend/src/core/RelayService.ts
@@ -3,7 +3,7 @@ import { IsNull } from 'typeorm';
 import type { LocalUser, User } from '@/models/entities/User.js';
 import type { RelaysRepository, UsersRepository } from '@/models/index.js';
 import { IdService } from '@/core/IdService.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { Relay } from '@/models/entities/Relay.js';
 import { QueueService } from '@/core/QueueService.js';
 import { CreateSystemUserService } from '@/core/CreateSystemUserService.js';
@@ -16,7 +16,7 @@ const ACTOR_USERNAME = 'relay.actor' as const;
 
 @Injectable()
 export class RelayService {
-	private relaysCache: KVCache<Relay[]>;
+	private relaysCache: MemoryKVCache<Relay[]>;
 
 	constructor(
 		@Inject(DI.usersRepository)
@@ -30,7 +30,7 @@ export class RelayService {
 		private createSystemUserService: CreateSystemUserService,
 		private apRendererService: ApRendererService,
 	) {
-		this.relaysCache = new KVCache<Relay[]>(1000 * 60 * 10);
+		this.relaysCache = new MemoryKVCache<Relay[]>(1000 * 60 * 10);
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/RoleService.ts b/packages/backend/src/core/RoleService.ts
index 7b63e43cb..678bcfc33 100644
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@@ -2,7 +2,7 @@ import { Inject, Injectable } from '@nestjs/common';
 import Redis from 'ioredis';
 import { In } from 'typeorm';
 import type { Role, RoleAssignment, RoleAssignmentsRepository, RolesRepository, UsersRepository } from '@/models/index.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { User } from '@/models/entities/User.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
@@ -57,8 +57,8 @@ export const DEFAULT_POLICIES: RolePolicies = {
 
 @Injectable()
 export class RoleService implements OnApplicationShutdown {
-	private rolesCache: KVCache<Role[]>;
-	private roleAssignmentByUserIdCache: KVCache<RoleAssignment[]>;
+	private rolesCache: MemoryKVCache<Role[]>;
+	private roleAssignmentByUserIdCache: MemoryKVCache<RoleAssignment[]>;
 
 	public static AlreadyAssignedError = class extends Error {};
 	public static NotAssignedError = class extends Error {};
@@ -84,8 +84,8 @@ export class RoleService implements OnApplicationShutdown {
 	) {
 		//this.onMessage = this.onMessage.bind(this);
 
-		this.rolesCache = new KVCache<Role[]>(Infinity);
-		this.roleAssignmentByUserIdCache = new KVCache<RoleAssignment[]>(Infinity);
+		this.rolesCache = new MemoryKVCache<Role[]>(Infinity);
+		this.roleAssignmentByUserIdCache = new MemoryKVCache<RoleAssignment[]>(Infinity);
 
 		this.redisSubscriber.on('message', this.onMessage);
 	}
diff --git a/packages/backend/src/core/UserBlockingService.ts b/packages/backend/src/core/UserBlockingService.ts
index 33b51537a..040b6de2e 100644
--- a/packages/backend/src/core/UserBlockingService.ts
+++ b/packages/backend/src/core/UserBlockingService.ts
@@ -15,7 +15,7 @@ import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { WebhookService } from '@/core/WebhookService.js';
 import { bindThis } from '@/decorators.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import { StreamMessages } from '@/server/api/stream/types.js';
 
 @Injectable()
@@ -23,7 +23,7 @@ export class UserBlockingService implements OnApplicationShutdown {
 	private logger: Logger;
 
 	// キーがユーザーIDで、値がそのユーザーがブロックしているユーザーのIDのリストなキャッシュ
-	private blockingsByUserIdCache: KVCache<User['id'][]>;
+	private blockingsByUserIdCache: MemoryKVCache<User['id'][]>;
 
 	constructor(
 		@Inject(DI.redisSubscriber)
@@ -58,7 +58,7 @@ export class UserBlockingService implements OnApplicationShutdown {
 	) {
 		this.logger = this.loggerService.getLogger('user-block');
 
-		this.blockingsByUserIdCache = new KVCache<User['id'][]>(Infinity);
+		this.blockingsByUserIdCache = new MemoryKVCache<User['id'][]>(Infinity);
 
 		this.redisSubscriber.on('message', this.onMessage);
 	}
diff --git a/packages/backend/src/core/UserCacheService.ts b/packages/backend/src/core/UserCacheService.ts
index 631eb4406..e452caf5d 100644
--- a/packages/backend/src/core/UserCacheService.ts
+++ b/packages/backend/src/core/UserCacheService.ts
@@ -1,7 +1,7 @@
 import { Inject, Injectable } from '@nestjs/common';
 import Redis from 'ioredis';
 import type { UsersRepository } from '@/models/index.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { LocalUser, User } from '@/models/entities/User.js';
 import { DI } from '@/di-symbols.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
@@ -11,10 +11,10 @@ import type { OnApplicationShutdown } from '@nestjs/common';
 
 @Injectable()
 export class UserCacheService implements OnApplicationShutdown {
-	public userByIdCache: KVCache<User>;
-	public localUserByNativeTokenCache: KVCache<LocalUser | null>;
-	public localUserByIdCache: KVCache<LocalUser>;
-	public uriPersonCache: KVCache<User | null>;
+	public userByIdCache: MemoryKVCache<User>;
+	public localUserByNativeTokenCache: MemoryKVCache<LocalUser | null>;
+	public localUserByIdCache: MemoryKVCache<LocalUser>;
+	public uriPersonCache: MemoryKVCache<User | null>;
 
 	constructor(
 		@Inject(DI.redisSubscriber)
@@ -27,10 +27,10 @@ export class UserCacheService implements OnApplicationShutdown {
 	) {
 		//this.onMessage = this.onMessage.bind(this);
 
-		this.userByIdCache = new KVCache<User>(Infinity);
-		this.localUserByNativeTokenCache = new KVCache<LocalUser | null>(Infinity);
-		this.localUserByIdCache = new KVCache<LocalUser>(Infinity);
-		this.uriPersonCache = new KVCache<User | null>(Infinity);
+		this.userByIdCache = new MemoryKVCache<User>(Infinity);
+		this.localUserByNativeTokenCache = new MemoryKVCache<LocalUser | null>(Infinity);
+		this.localUserByIdCache = new MemoryKVCache<LocalUser>(Infinity);
+		this.uriPersonCache = new MemoryKVCache<User | null>(Infinity);
 
 		this.redisSubscriber.on('message', this.onMessage);
 	}
diff --git a/packages/backend/src/core/UserKeypairStoreService.ts b/packages/backend/src/core/UserKeypairStoreService.ts
index 61c9293f8..872a0335e 100644
--- a/packages/backend/src/core/UserKeypairStoreService.ts
+++ b/packages/backend/src/core/UserKeypairStoreService.ts
@@ -1,20 +1,20 @@
 import { Inject, Injectable } from '@nestjs/common';
 import type { User } from '@/models/entities/User.js';
 import type { UserKeypairsRepository } from '@/models/index.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { UserKeypair } from '@/models/entities/UserKeypair.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
 
 @Injectable()
 export class UserKeypairStoreService {
-	private cache: KVCache<UserKeypair>;
+	private cache: MemoryKVCache<UserKeypair>;
 
 	constructor(
 		@Inject(DI.userKeypairsRepository)
 		private userKeypairsRepository: UserKeypairsRepository,
 	) {
-		this.cache = new KVCache<UserKeypair>(Infinity);
+		this.cache = new MemoryKVCache<UserKeypair>(Infinity);
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/activitypub/ApDbResolverService.ts b/packages/backend/src/core/activitypub/ApDbResolverService.ts
index c3b387561..dc0a865bb 100644
--- a/packages/backend/src/core/activitypub/ApDbResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApDbResolverService.ts
@@ -3,7 +3,7 @@ import escapeRegexp from 'escape-regexp';
 import { DI } from '@/di-symbols.js';
 import type { NotesRepository, UserPublickeysRepository, UsersRepository } from '@/models/index.js';
 import type { Config } from '@/config.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { UserPublickey } from '@/models/entities/UserPublickey.js';
 import { UserCacheService } from '@/core/UserCacheService.js';
 import type { Note } from '@/models/entities/Note.js';
@@ -31,8 +31,8 @@ export type UriParseResult = {
 
 @Injectable()
 export class ApDbResolverService {
-	private publicKeyCache: KVCache<UserPublickey | null>;
-	private publicKeyByUserIdCache: KVCache<UserPublickey | null>;
+	private publicKeyCache: MemoryKVCache<UserPublickey | null>;
+	private publicKeyByUserIdCache: MemoryKVCache<UserPublickey | null>;
 
 	constructor(
 		@Inject(DI.config)
@@ -50,8 +50,8 @@ export class ApDbResolverService {
 		private userCacheService: UserCacheService,
 		private apPersonService: ApPersonService,
 	) {
-		this.publicKeyCache = new KVCache<UserPublickey | null>(Infinity);
-		this.publicKeyByUserIdCache = new KVCache<UserPublickey | null>(Infinity);
+		this.publicKeyCache = new MemoryKVCache<UserPublickey | null>(Infinity);
+		this.publicKeyByUserIdCache = new MemoryKVCache<UserPublickey | null>(Infinity);
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index ae7c47a99..71aa2ee6d 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -9,7 +9,7 @@ import type { Packed } from '@/misc/json-schema.js';
 import type { Promiseable } from '@/misc/prelude/await-all.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import { USER_ACTIVE_THRESHOLD, USER_ONLINE_THRESHOLD } from '@/const.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { Instance } from '@/models/entities/Instance.js';
 import type { LocalUser, RemoteUser, User } from '@/models/entities/User.js';
 import { birthdaySchema, descriptionSchema, localUsernameSchema, locationSchema, nameSchema, passwordSchema } from '@/models/entities/User.js';
@@ -53,7 +53,7 @@ export class UserEntityService implements OnModuleInit {
 	private customEmojiService: CustomEmojiService;
 	private antennaService: AntennaService;
 	private roleService: RoleService;
-	private userInstanceCache: KVCache<Instance | null>;
+	private userInstanceCache: MemoryKVCache<Instance | null>;
 
 	constructor(
 		private moduleRef: ModuleRef,
@@ -119,7 +119,7 @@ export class UserEntityService implements OnModuleInit {
 		//private antennaService: AntennaService,
 		//private roleService: RoleService,
 	) {
-		this.userInstanceCache = new KVCache<Instance | null>(1000 * 60 * 60 * 3);
+		this.userInstanceCache = new MemoryKVCache<Instance | null>(1000 * 60 * 60 * 3);
 	}
 
 	onModuleInit() {
diff --git a/packages/backend/src/misc/cache.ts b/packages/backend/src/misc/cache.ts
index b249cf448..a805d1842 100644
--- a/packages/backend/src/misc/cache.ts
+++ b/packages/backend/src/misc/cache.ts
@@ -2,11 +2,11 @@ import { bindThis } from '@/decorators.js';
 
 // TODO: メモリ節約のためあまり参照されないキーを定期的に削除できるようにする？
 
-export class KVCache<T> {
+export class MemoryKVCache<T> {
 	public cache: Map<string | null, { date: number; value: T; }>;
 	private lifetime: number;
 
-	constructor(lifetime: KVCache<never>['lifetime']) {
+	constructor(lifetime: MemoryKVCache<never>['lifetime']) {
 		this.cache = new Map();
 		this.lifetime = lifetime;
 	}
@@ -88,12 +88,12 @@ export class KVCache<T> {
 	}
 }
 
-export class Cache<T> {
+export class MemoryCache<T> {
 	private cachedAt: number | null = null;
 	private value: T | undefined;
 	private lifetime: number;
 
-	constructor(lifetime: Cache<never>['lifetime']) {
+	constructor(lifetime: MemoryCache<never>['lifetime']) {
 		this.lifetime = lifetime;
 	}
 
diff --git a/packages/backend/src/queue/processors/DeliverProcessorService.ts b/packages/backend/src/queue/processors/DeliverProcessorService.ts
index f637bf881..71865c778 100644
--- a/packages/backend/src/queue/processors/DeliverProcessorService.ts
+++ b/packages/backend/src/queue/processors/DeliverProcessorService.ts
@@ -7,7 +7,7 @@ import { MetaService } from '@/core/MetaService.js';
 import { ApRequestService } from '@/core/activitypub/ApRequestService.js';
 import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
 import { FetchInstanceMetadataService } from '@/core/FetchInstanceMetadataService.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { Instance } from '@/models/entities/Instance.js';
 import InstanceChart from '@/core/chart/charts/instance.js';
 import ApRequestChart from '@/core/chart/charts/ap-request.js';
@@ -22,7 +22,7 @@ import type { DeliverJobData } from '../types.js';
 @Injectable()
 export class DeliverProcessorService {
 	private logger: Logger;
-	private suspendedHostsCache: KVCache<Instance[]>;
+	private suspendedHostsCache: MemoryKVCache<Instance[]>;
 	private latest: string | null;
 
 	constructor(
@@ -46,7 +46,7 @@ export class DeliverProcessorService {
 		private queueLoggerService: QueueLoggerService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('deliver');
-		this.suspendedHostsCache = new KVCache<Instance[]>(1000 * 60 * 60);
+		this.suspendedHostsCache = new MemoryKVCache<Instance[]>(1000 * 60 * 60);
 	}
 
 	@bindThis
diff --git a/packages/backend/src/server/NodeinfoServerService.ts b/packages/backend/src/server/NodeinfoServerService.ts
index 86019d416..3387bd53a 100644
--- a/packages/backend/src/server/NodeinfoServerService.ts
+++ b/packages/backend/src/server/NodeinfoServerService.ts
@@ -4,7 +4,7 @@ import type { NotesRepository, UsersRepository } from '@/models/index.js';
 import type { Config } from '@/config.js';
 import { MetaService } from '@/core/MetaService.js';
 import { MAX_NOTE_TEXT_LENGTH } from '@/const.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { bindThis } from '@/decorators.js';
 import NotesChart from '@/core/chart/charts/notes.js';
@@ -118,7 +118,7 @@ export class NodeinfoServerService {
 			};
 		};
 
-		const cache = new KVCache<Awaited<ReturnType<typeof nodeinfo2>>>(1000 * 60 * 10);
+		const cache = new MemoryKVCache<Awaited<ReturnType<typeof nodeinfo2>>>(1000 * 60 * 10);
 
 		fastify.get(nodeinfo2_1path, async (request, reply) => {
 			const base = await cache.fetch(null, () => nodeinfo2());
diff --git a/packages/backend/src/server/api/AuthenticateService.ts b/packages/backend/src/server/api/AuthenticateService.ts
index a1895e370..cd6bce9ef 100644
--- a/packages/backend/src/server/api/AuthenticateService.ts
+++ b/packages/backend/src/server/api/AuthenticateService.ts
@@ -3,7 +3,7 @@ import { DI } from '@/di-symbols.js';
 import type { AccessTokensRepository, AppsRepository, UsersRepository } from '@/models/index.js';
 import type { LocalUser } from '@/models/entities/User.js';
 import type { AccessToken } from '@/models/entities/AccessToken.js';
-import { KVCache } from '@/misc/cache.js';
+import { MemoryKVCache } from '@/misc/cache.js';
 import type { App } from '@/models/entities/App.js';
 import { UserCacheService } from '@/core/UserCacheService.js';
 import isNativeToken from '@/misc/is-native-token.js';
@@ -18,7 +18,7 @@ export class AuthenticationError extends Error {
 
 @Injectable()
 export class AuthenticateService {
-	private appCache: KVCache<App>;
+	private appCache: MemoryKVCache<App>;
 
 	constructor(
 		@Inject(DI.usersRepository)
@@ -32,7 +32,7 @@ export class AuthenticateService {
 
 		private userCacheService: UserCacheService,
 	) {
-		this.appCache = new KVCache<App>(Infinity);
+		this.appCache = new MemoryKVCache<App>(Infinity);
 	}
 
 	@bindThis