diff --git a/packages/backend/src/core/entities/EmojiEntityService.ts b/packages/backend/src/core/entities/EmojiEntityService.ts
index 2a4e09519f..cee85a5688 100644
--- a/packages/backend/src/core/entities/EmojiEntityService.ts
+++ b/packages/backend/src/core/entities/EmojiEntityService.ts
@@ -22,7 +22,7 @@ export class EmojiEntityService {
 	@bindThis
 	public async pack(
 		src: Emoji['id'] | Emoji,
-		opts: { omitHost?: boolean; omitId?: boolean; } = {},
+		opts: { omitHost?: boolean; omitId?: boolean; withUrl?: boolean; } = {},
 	): Promise<Packed<'Emoji'>> {
 		const emoji = typeof src === 'object' ? src : await this.emojisRepository.findOneByOrFail({ id: src });
 
@@ -32,13 +32,15 @@ export class EmojiEntityService {
 			name: emoji.name,
 			category: emoji.category,
 			host: opts.omitHost ? undefined : emoji.host,
+			// ?? emoji.originalUrl してるのは後方互換性のため
+			url: opts.withUrl ? (emoji.publicUrl ?? emoji.originalUrl) : undefined,
 		};
 	}
 
 	@bindThis
 	public packMany(
 		emojis: any[],
-		opts: { omitHost?: boolean; omitId?: boolean; } = {},
+		opts: { omitHost?: boolean; omitId?: boolean; withUrl?: boolean; } = {},
 	) {
 		return Promise.all(emojis.map(x => this.pack(x, opts)));
 	}
diff --git a/packages/backend/src/models/schema/emoji.ts b/packages/backend/src/models/schema/emoji.ts
index d897a0fc05..143f25373c 100644
--- a/packages/backend/src/models/schema/emoji.ts
+++ b/packages/backend/src/models/schema/emoji.ts
@@ -29,5 +29,9 @@ export const packedEmojiSchema = {
 			optional: true, nullable: true,
 			description: 'The local host is represented with `null`.',
 		},
+		url: {
+			type: 'string',
+			optional: true, nullable: false,
+		},
 	},
 } as const;
diff --git a/packages/backend/src/server/api/endpoints/emojis.ts b/packages/backend/src/server/api/endpoints/emojis.ts
index 97dcfde596..db1eddc80a 100644
--- a/packages/backend/src/server/api/endpoints/emojis.ts
+++ b/packages/backend/src/server/api/endpoints/emojis.ts
@@ -83,6 +83,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				emojis: await this.emojiEntityService.packMany(emojis, {
 					omitId: true,
 					omitHost: true,
+					withUrl: true,
 				}),
 			};
 		});
diff --git a/packages/frontend/src/components/global/MkEmoji.vue b/packages/frontend/src/components/global/MkEmoji.vue
index b7dd0296cd..aaad81c656 100644
--- a/packages/frontend/src/components/global/MkEmoji.vue
+++ b/packages/frontend/src/components/global/MkEmoji.vue
@@ -12,6 +12,7 @@ import { getStaticImageUrl } from '@/scripts/media-proxy';
 import { char2twemojiFilePath, char2fluentEmojiFilePath } from '@/scripts/emoji-base';
 import { defaultStore } from '@/store';
 import { getEmojiName } from '@/scripts/emojilist';
+import { customEmojis } from '@/custom-emojis';
 
 const props = defineProps<{
 	emoji: string;
@@ -30,6 +31,9 @@ const useOsNativeEmojis = computed(() => defaultStore.state.emojiStyle === 'nati
 const url = computed(() => {
 	if (char.value) {
 		return char2path(char.value);
+	} else if (props.host == null) {
+		const found = customEmojis.find(x => x.name === customEmojiName);
+		return found ? found.url : null;
 	} else {
 		const rawUrl = props.host ? `/emoji/${customEmojiName}@${props.host}.webp` : `/emoji/${customEmojiName}.webp`;
 		return defaultStore.state.disableShowingAnimatedImages
@@ -38,7 +42,7 @@ const url = computed(() => {
 	}
 });
 const alt = computed(() => isCustom.value ? `:${customEmojiName}:` : char.value);
-let errored = $ref(false);
+let errored = $ref(isCustom.value && url.value == null);
 
 // Searching from an array with 2000 items for every emoji felt like too energy-consuming, so I decided to do it lazily on pointerenter
 function computeTitle(event: PointerEvent): void {
diff --git a/packages/frontend/src/custom-emojis.ts b/packages/frontend/src/custom-emojis.ts
index 19469999b6..637ee9c06e 100644
--- a/packages/frontend/src/custom-emojis.ts
+++ b/packages/frontend/src/custom-emojis.ts
@@ -2,14 +2,19 @@ import { api } from './os';
 import { miLocalStorage } from './local-storage';
 
 const storageCache = miLocalStorage.getItem('emojis');
-export let customEmojis = storageCache ? JSON.parse(storageCache) : [];
+export let customEmojis: {
+	name: string;
+	aliases: string[];
+	category: string;
+	url: string;
+}[] = storageCache ? JSON.parse(storageCache) : [];
 
 fetchCustomEmojis();
 
 export async function fetchCustomEmojis() {
 	const now = Date.now();
 	const lastFetchedAt = miLocalStorage.getItem('lastEmojisFetchedAt');
-	if (lastFetchedAt && (now - parseInt(lastFetchedAt)) < 1000 * 60 * 60) return;
+	if (lastFetchedAt && (now - parseInt(lastFetchedAt)) < 1000 * 60 * 60 * 24) return;
 
 	const res = await api('emojis', {});