diff --git a/packages/frontend/src/components/MkAutocomplete.vue b/packages/frontend/src/components/MkAutocomplete.vue
index 2f3855266..06de95ab1 100644
--- a/packages/frontend/src/components/MkAutocomplete.vue
+++ b/packages/frontend/src/components/MkAutocomplete.vue
@@ -15,12 +15,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</li>
 		<li tabindex="-1" :class="$style.item" @click="chooseUser()" @keydown="onKeydown">{{ i18n.ts.selectUser }}</li>
 	</ol>
-	<ol v-else-if="hashtags.length > 0" ref="suggests" :class="$style.list">
+	<ol v-else-if="type === 'hashtag' && hashtags.length > 0" ref="suggests" :class="$style.list">
 		<li v-for="hashtag in hashtags" tabindex="-1" :class="$style.item" @click="complete(type, hashtag)" @keydown="onKeydown">
 			<span class="name">{{ hashtag }}</span>
 		</li>
 	</ol>
-	<ol v-else-if="emojis.length > 0" ref="suggests" :class="$style.list">
+	<ol v-else-if="type === 'emoji' || type === 'emojiComplete' && emojis.length > 0" ref="suggests" :class="$style.list">
 		<li v-for="emoji in emojis" :key="emoji.emoji" :class="$style.item" tabindex="-1" @click="complete(type, emoji.emoji)" @keydown="onKeydown">
 			<MkCustomEmoji v-if="'isCustomEmoji' in emoji && emoji.isCustomEmoji" :name="emoji.emoji" :class="$style.emoji"/>
 			<MkEmoji v-else :emoji="emoji.emoji" :class="$style.emoji"/>
@@ -30,12 +30,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<span v-if="emoji.aliasOf" :class="$style.emojiAlias">({{ emoji.aliasOf }})</span>
 		</li>
 	</ol>
-	<ol v-else-if="mfmTags.length > 0" ref="suggests" :class="$style.list">
+	<ol v-else-if="type === 'mfmTag' && mfmTags.length > 0" ref="suggests" :class="$style.list">
 		<li v-for="tag in mfmTags" tabindex="-1" :class="$style.item" @click="complete(type, tag)" @keydown="onKeydown">
 			<span>{{ tag }}</span>
 		</li>
 	</ol>
-	<ol v-else-if="mfmParams.length > 0" ref="suggests" :class="$style.list">
+	<ol v-else-if="type === 'mfmParam' && mfmParams.length > 0" ref="suggests" :class="$style.list">
 		<li v-for="param in mfmParams" tabindex="-1" :class="$style.item" @click="complete(type, q.params.toSpliced(-1, 1, param).join(','))" @keydown="onKeydown">
 			<span>{{ param }}</span>
 		</li>
@@ -59,9 +59,41 @@ import { customEmojis } from '@/custom-emojis.js';
 import { MFM_TAGS, MFM_PARAMS } from '@/const.js';
 import { searchEmoji, EmojiDef } from '@/scripts/search-emoji.js';
 
+export type CompleteInfo = {
+	user: {
+		payload: any;
+		query: string | null;
+	},
+	hashtag: {
+		payload: string;
+		query: string;
+	},
+	// `:emo` -> `:emoji:` or some unicode emoji
+	emoji: {
+		payload: string;
+		query: string;
+	},
+	// like emoji but for `:emoji:` -> unicode emoji
+	emojiComplete: {
+		payload: string;
+		query: string;
+	},
+	mfmTag: {
+		payload: string;
+		query: string;
+	},
+	mfmParam: {
+		payload: string;
+		query: {
+			tag: string;
+			params: string[];
+		};
+	},
+}
+
 const lib = emojilist.filter(x => x.category !== 'flags');
 
-const emojiDb = computed(() => {
+const unicodeEmojiDB = computed(() => {
 	//#region Unicode Emoji
 	const char2path = defaultStore.reactiveState.emojiStyle.value === 'twemoji' ? char2twemojiFilePath : char2fluentEmojiFilePath;
 
@@ -87,6 +119,10 @@ const emojiDb = computed(() => {
 	unicodeEmojiDB.sort((a, b) => a.name.length - b.name.length);
 	//#endregion
 
+	return unicodeEmojiDB;
+});
+
+const emojiDb = computed(() => {
 	//#region Custom Emoji
 	const customEmojiDB: EmojiDef[] = [];
 
@@ -112,7 +148,7 @@ const emojiDb = computed(() => {
 	customEmojiDB.sort((a, b) => a.name.length - b.name.length);
 	//#endregion
 
-	return markRaw([...customEmojiDB, ...unicodeEmojiDB]);
+	return markRaw([...customEmojiDB, ...unicodeEmojiDB.value]);
 });
 
 export default {
@@ -121,18 +157,23 @@ export default {
 };
 </script>
 
-<script lang="ts" setup>
-const props = defineProps<{
-	type: string;
-	q: any;
-	textarea: HTMLTextAreaElement;
+<script lang="ts" setup generic="T extends keyof CompleteInfo">
+type PropsType<T extends keyof CompleteInfo> = {
+	type: T;
+	q: CompleteInfo[T]['query'];
+	// なぜかわからないけど HTMLTextAreaElement | HTMLInputElement だと addEventListener/removeEventListenerがエラー
+	textarea: (HTMLTextAreaElement | HTMLInputElement) & HTMLElement;
 	close: () => void;
 	x: number;
 	y: number;
-}>();
+}
+//const props = defineProps<PropsType<keyof CompleteInfo>>();
+// ↑と同じだけど↓にしないとdiscriminated unionにならない。
+// https://www.typescriptlang.org/docs/handbook/typescript-in-5-minutes-func.html#discriminated-unions
+const props = defineProps<PropsType<'user'> | PropsType<'hashtag'> | PropsType<'emoji'> | PropsType<'emojiComplete'> | PropsType<'mfmTag'> | PropsType<'mfmParam'>>();
 
 const emit = defineEmits<{
-	(event: 'done', value: { type: string; value: any }): void;
+	<T extends keyof CompleteInfo>(event: 'done', value: { type: T; value: CompleteInfo[T]['payload'] }): void;
 	(event: 'closed'): void;
 }>();
 
@@ -149,10 +190,10 @@ const mfmParams = ref<string[]>([]);
 const select = ref(-1);
 const zIndex = os.claimZIndex('high');
 
-function complete(type: string, value: any) {
+function complete<T extends keyof CompleteInfo>(type: T, value: CompleteInfo[T]['payload']) {
 	emit('done', { type, value });
 	emit('closed');
-	if (type === 'emoji') {
+	if (type === 'emoji' || type === 'emojiComplete') {
 		let recents = defaultStore.state.recentlyUsedEmojis;
 		recents = recents.filter((emoji: any) => emoji !== value);
 		recents.unshift(value);
@@ -239,6 +280,14 @@ function exec() {
 		}
 
 		emojis.value = searchEmoji(props.q, emojiDb.value);
+	} else if (props.type === 'emojiComplete') {
+		if (!props.q || props.q === '') {
+			// 最近使った絵文字をサジェスト
+			emojis.value = defaultStore.state.recentlyUsedEmojis.map(emoji => unicodeEmojiDB.value.find(dbEmoji => dbEmoji.emoji === emoji)).filter(x => x) as EmojiDef[];
+			return;
+		}
+
+		emojis.value = searchEmoji(props.q, unicodeEmojiDB.value);
 	} else if (props.type === 'mfmTag') {
 		if (!props.q || props.q === '') {
 			mfmTags.value = MFM_TAGS;
diff --git a/packages/frontend/src/scripts/autocomplete.ts b/packages/frontend/src/scripts/autocomplete.ts
index 9fc8f7843..2cc87119f 100644
--- a/packages/frontend/src/scripts/autocomplete.ts
+++ b/packages/frontend/src/scripts/autocomplete.ts
@@ -6,6 +6,7 @@
 import { nextTick, Ref, ref, defineAsyncComponent } from 'vue';
 import getCaretCoordinates from 'textarea-caret';
 import { toASCII } from 'punycode/';
+import type { CompleteInfo } from '@/components/MkAutocomplete.vue';
 import { popup } from '@/os.js';
 
 export type SuggestionType = 'user' | 'hashtag' | 'emoji' | 'mfmTag' | 'mfmParam';
@@ -18,7 +19,7 @@ export class Autocomplete {
 		close: () => void;
 	} | null;
 	private textarea: HTMLInputElement | HTMLTextAreaElement;
-	private currentType: string;
+	private currentType: keyof CompleteInfo | undefined;
 	private textRef: Ref<string | number | null>;
 	private opening: boolean;
 	private onlyType: SuggestionType[];
@@ -73,7 +74,7 @@ export class Autocomplete {
 	 * テキスト入力時
 	 */
 	private onInput() {
-		const caretPos = this.textarea.selectionStart;
+		const caretPos = Number(this.textarea.selectionStart);
 		const text = this.text.substring(0, caretPos).split('\n').pop()!;
 
 		const mentionIndex = text.lastIndexOf('@');
@@ -100,6 +101,8 @@ export class Autocomplete {
 		const isMfmParam = mfmParamIndex !== -1 && afterLastMfmParam?.includes('.') && !afterLastMfmParam?.includes(' ');
 		const isMfmTag = mfmTagIndex !== -1 && !isMfmParam;
 		const isEmoji = emojiIndex !== -1 && text.split(/:[a-z0-9_+\-]+:/).pop()!.includes(':');
+		// :ok:などを🆗にするたいおぷ
+		const isEmojiCompleteToUnicode = !isEmoji && emojiIndex === text.length - 1;
 
 		let opened = false;
 
@@ -130,6 +133,14 @@ export class Autocomplete {
 			}
 		}
 
+		if (isEmojiCompleteToUnicode && !opened && this.onlyType.includes('emoji')) {
+			const emoji = text.substring(text.lastIndexOf(':', text.length - 2) + 1, text.length - 1);
+			if (!emoji.includes(' ')) {
+				this.open('emojiComplete', emoji);
+				opened = true;
+			}
+		}
+
 		if (isMfmTag && !opened && this.onlyType.includes('mfmTag')) {
 			const mfmTag = text.substring(mfmTagIndex + 1);
 			if (!mfmTag.includes(' ')) {
@@ -157,7 +168,7 @@ export class Autocomplete {
 	/**
 	 * サジェストを提示します。
 	 */
-	private async open(type: string, q: any) {
+	private async open<T extends keyof CompleteInfo>(type: T, q: CompleteInfo[T]['query']) {
 		if (type !== this.currentType) {
 			this.close();
 		}
@@ -224,10 +235,10 @@ export class Autocomplete {
 	/**
 	 * オートコンプリートする
 	 */
-	private complete({ type, value }) {
+	private complete<T extends keyof CompleteInfo>({ type, value }: { type: T; value: CompleteInfo[T]['payload'] }) {
 		this.close();
 
-		const caret = this.textarea.selectionStart;
+		const caret = Number(this.textarea.selectionStart);
 
 		if (type === 'user') {
 			const source = this.text;
@@ -273,6 +284,22 @@ export class Autocomplete {
 			// 挿入
 			this.text = trimmedBefore + value + after;
 
+			// キャレットを戻す
+			nextTick(() => {
+				this.textarea.focus();
+				const pos = trimmedBefore.length + value.length;
+				this.textarea.setSelectionRange(pos, pos);
+			});
+		} else if (type === 'emojiComplete') {
+			const source = this.text;
+
+			const before = source.substring(0, caret);
+			const trimmedBefore = before.substring(0, before.lastIndexOf(':', before.length - 2));
+			const after = source.substring(caret);
+
+			// 挿入
+			this.text = trimmedBefore + value + after;
+
 			// キャレットを戻す
 			nextTick(() => {
 				this.textarea.focus();