diff --git a/packages/frontend/src/components/MkReactionsViewer.details.vue b/packages/frontend/src/components/MkReactionsViewer.details.vue
index f4c3643ba..ce2f453a6 100644
--- a/packages/frontend/src/components/MkReactionsViewer.details.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.details.vue
@@ -30,7 +30,7 @@ import MkReactionIcon from '@/components/MkReactionIcon.vue';
 defineProps<{
 	showing: boolean;
 	reaction: string;
-	users: any[]; // TODO
+	users: any[];
 	count: number;
 	targetElement: HTMLElement;
 }>();
diff --git a/packages/frontend/src/components/MkReactionsViewer.reaction.vue b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
index 53c1f400e..16326fa3f 100644
--- a/packages/frontend/src/components/MkReactionsViewer.reaction.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
@@ -8,8 +8,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 	ref="buttonEl"
 	v-ripple="canToggle"
 	class="_button"
-	:class="[$style.root, { [$style.reacted]: note.myReaction == reaction, [$style.canToggle]: canToggle, [$style.small]: defaultStore.state.reactionsDisplaySize === 'small', [$style.large]: defaultStore.state.reactionsDisplaySize === 'large' }]"
-	@click.stop="toggleReaction()"
+	:class="[$style.root, { [$style.reacted]: isReacted, [$style.canToggle]: canToggle, [$style.small]: defaultStore.state.reactionsDisplaySize === 'small', [$style.large]: defaultStore.state.reactionsDisplaySize === 'large' }]"
+	@click.stop="toggleReaction()"  
 	@contextmenu.prevent.stop="menu"
 >
 	<MkReactionIcon :class="defaultStore.state.limitWidthOfReaction ? $style.limitWidth : ''" :reaction="reaction" :emojiUrl="note.reactionEmojis[reaction.substring(1, reaction.length - 1)]"/>
@@ -18,7 +18,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, inject, onMounted, shallowRef, watch } from 'vue';
+import { computed, inject, onMounted, onBeforeMount, shallowRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
 import { getUnicodeEmoji } from '@@/js/emojilist.js';
 import MkCustomEmojiDetailedDialog from './MkCustomEmojiDetailedDialog.vue';
@@ -33,9 +33,33 @@ import { claimAchievement } from '@/scripts/achievements.js';
 import { defaultStore } from '@/store.js';
 import { i18n } from '@/i18n.js';
 import * as sound from '@/scripts/sound.js';
-import { checkReactionPermissions } from '@/scripts/check-reaction-permissions.js';
 import { customEmojisMap } from '@/custom-emojis.js';
 
+const localEmojiSet = new Set(Array.from(customEmojisMap.keys()));
+const reactionCache = new Map<string, { hasNative: boolean; base: string }>();
+
+function getReactionInfo(reaction: string) {
+  if (reactionCache.has(reaction)) {
+    return reactionCache.get(reaction)!;
+  }
+
+  let hasNative: boolean;
+  let base: string;
+
+  if (!reaction.includes(':')) {
+    hasNative = true;
+    base = reaction;
+  } else {
+    const baseName = reaction.split('@')[0].split(':')[1];
+    hasNative = localEmojiSet.has(baseName);
+    base = hasNative ? `:${baseName}:` : reaction;
+  }
+
+  const info = { hasNative, base };
+  reactionCache.set(reaction, info);
+  return info;
+}
+
 const props = defineProps<{
 	reaction: string;
 	count: number;
@@ -54,26 +78,32 @@ const buttonEl = shallowRef<HTMLElement>();
 const emojiName = computed(() => props.reaction.replace(/:/g, '').replace(/@\./, ''));
 const emoji = computed(() => customEmojisMap.get(emojiName.value) ?? getUnicodeEmoji(props.reaction));
 
-const canToggle = computed(() => {
-	return !props.reaction.match(/@\w/) && $i && emoji.value && checkReactionPermissions($i, props.note, emoji.value);
+const reactionInfo = computed(() => getReactionInfo(props.reaction));
+const hasNativeEmoji = computed(() => reactionInfo.value.hasNative);
+const baseReaction = computed(() => reactionInfo.value.base);
+
+const canToggle = computed(() => $i != null && hasNativeEmoji.value);
+
+const isReacted = computed(() => {
+  if (!props.note.myReaction) return false;
+  const myInfo = getReactionInfo(props.note.myReaction);
+  return myInfo.base === reactionInfo.value.base;
 });
-const canGetInfo = computed(() => !props.reaction.match(/@\w/) && props.reaction.includes(':'));
+
+let lastCount = props.count;
 
 async function toggleReaction() {
 	if (!canToggle.value) return;
-
+	
 	const oldReaction = props.note.myReaction;
-	if (oldReaction) {
+	
+	if (isReacted.value) {
 		const confirm = await os.confirm({
 			type: 'warning',
-			text: oldReaction !== props.reaction ? i18n.ts.changeReactionConfirm : i18n.ts.cancelReactionConfirm,
+			text: i18n.ts.cancelReactionConfirm,
 		});
 		if (confirm.canceled) return;
 
-		if (oldReaction !== props.reaction) {
-			sound.playMisskeySfx('reaction');
-		}
-
 		if (mock) {
 			emit('reactionToggled', props.reaction, (props.count - 1));
 			return;
@@ -81,15 +111,17 @@ async function toggleReaction() {
 
 		misskeyApi('notes/reactions/delete', {
 			noteId: props.note.id,
-		}).then(() => {
-			if (oldReaction !== props.reaction) {
-				misskeyApi('notes/reactions/create', {
-					noteId: props.note.id,
-					reaction: props.reaction,
-				});
-			}
 		});
-	} else {
+		return;
+	}
+
+	if (oldReaction) {
+		const confirm = await os.confirm({
+			type: 'warning',
+			text: i18n.ts.changeReactionConfirm,
+		});
+		if (confirm.canceled) return;
+
 		sound.playMisskeySfx('reaction');
 
 		if (mock) {
@@ -97,18 +129,30 @@ async function toggleReaction() {
 			return;
 		}
 
-		misskeyApi('notes/reactions/create', {
+		await misskeyApi('notes/reactions/delete', {
 			noteId: props.note.id,
-			reaction: props.reaction,
 		});
-		if (props.note.text && props.note.text.length > 100 && (Date.now() - new Date(props.note.createdAt).getTime() < 1000 * 3)) {
-			claimAchievement('reactWithoutRead');
-		}
+	}
+
+	sound.playMisskeySfx('reaction');
+
+	if (mock) {
+		emit('reactionToggled', props.reaction, (props.count + 1));
+		return;
+	}
+
+	misskeyApi('notes/reactions/create', {
+		noteId: props.note.id,
+		reaction: baseReaction.value,
+	});
+	
+	if (props.note.text && props.note.text.length > 100 && (Date.now() - new Date(props.note.createdAt).getTime() < 1000 * 3)) {
+		claimAchievement('reactWithoutRead');
 	}
 }
 
 async function menu(ev) {
-	if (!canGetInfo.value) return;
+	if (!props.reaction.includes(':')) return;
 
 	os.popupMenu([{
 		text: i18n.ts.info,
@@ -137,28 +181,54 @@ function anime() {
 }
 
 watch(() => props.count, (newCount, oldCount) => {
-	if (oldCount < newCount) anime();
-});
+	if (oldCount < newCount && !props.isInitial) anime();
+	lastCount = newCount;
+}, { immediate: true });
 
-onMounted(() => {
-	if (!props.isInitial) anime();
+onBeforeMount(() => {
+  getReactionInfo(props.reaction);
+  if (props.note.myReaction) {
+    getReactionInfo(props.note.myReaction);
+  }
+  Object.keys(props.note.reactions).forEach(reaction => {
+    getReactionInfo(reaction);
+  });
 });
 
 if (!mock) {
 	useTooltip(buttonEl, async (showing) => {
-		const reactions = await misskeyApiGet('notes/reactions', {
-			noteId: props.note.id,
-			type: props.reaction,
-			limit: 10,
-			_cacheKey_: props.count,
-		});
+    const allVariants = new Set([props.reaction]);
+    
+    if (reactionInfo.value.hasNative) {
+      allVariants.add(reactionInfo.value.base);
+      
+      Object.keys(props.note.reactions).forEach(reaction => {
+        const info = getReactionInfo(reaction);
+        if (info.hasNative && info.base === reactionInfo.value.base) {
+          allVariants.add(reaction);
+        }
+      });
+    }
 
-		const users = reactions.map(x => x.user);
+    const reactionPromises = Array.from(allVariants).map(variant =>
+      misskeyApiGet('notes/reactions', {
+        noteId: props.note.id,
+        type: variant,
+        limit: 10,
+        _cacheKey_: props.count,
+      })
+    );
+
+    const allReactions = await Promise.all(reactionPromises);
+    
+    const allUsers = [...new Map(
+      allReactions.flat().map(x => [x.user.id, x.user])
+    ).values()];
 
 		const { dispose } = os.popup(XDetails, {
 			showing,
 			reaction: props.reaction,
-			users,
+			users: allUsers,
 			count: props.count,
 			targetElement: buttonEl.value,
 		}, {
diff --git a/packages/frontend/src/components/MkReactionsViewer.vue b/packages/frontend/src/components/MkReactionsViewer.vue
index 63b202f9f..0fee9613d 100644
--- a/packages/frontend/src/components/MkReactionsViewer.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.vue
@@ -12,16 +12,40 @@ SPDX-License-Identifier: AGPL-3.0-only
 	:moveClass="defaultStore.state.animation ? $style.transition_x_move : ''"
 	tag="div" :class="$style.root"
 >
-	<XReaction v-for="[reaction, count] in reactions" :key="reaction" :reaction="reaction" :count="count" :isInitial="initialReactions.has(reaction)" :note="note" @reactionToggled="onMockToggleReaction"/>
+	<XReaction v-for="[reaction, count] in mergedReactions" :key="reaction" :reaction="reaction" :count="count" :isInitial="initialReactions.has(reaction)" :note="note" @reactionToggled="onMockToggleReaction"/>
 	<slot v-if="hasMoreReactions" name="more"/>
 </TransitionGroup>
 </template>
 
 <script lang="ts" setup>
 import * as Misskey from 'misskey-js';
-import { inject, watch, ref } from 'vue';
+import { inject, watch, ref, computed, onBeforeMount } from 'vue';
 import XReaction from '@/components/MkReactionsViewer.reaction.vue';
 import { defaultStore } from '@/store.js';
+import { customEmojisMap } from '@/custom-emojis.js';
+
+const localEmojiSet = new Set(Array.from(customEmojisMap.keys()));
+const emojiCache = new Map<string, boolean>();
+
+function hasLocalEmoji(reaction: string): boolean {
+  if (emojiCache.has(reaction)) return emojiCache.get(reaction)!;
+  
+  let result: boolean;
+  if (!reaction.includes(':')) {
+    result = true;
+  } else {
+    const emojiName = reaction.split('@')[0].split(':')[1];
+    result = localEmojiSet.has(emojiName);
+  }
+  
+  emojiCache.set(reaction, result);
+  return result;
+}
+
+function getBaseReaction(reaction: string): string {
+  if (!reaction.includes(':')) return reaction;
+  return `:${reaction.split('@')[0].split(':')[1]}:`;
+}
 
 const props = withDefaults(defineProps<{
 	note: Misskey.entities.Note;
@@ -41,10 +65,40 @@ const initialReactions = new Set(Object.keys(props.note.reactions));
 const reactions = ref<[string, number][]>([]);
 const hasMoreReactions = ref(false);
 
+const mergedReactions = computed(() => {
+  const reactionMap = new Map();
+  
+  reactions.value.forEach(([reaction, count]) => {
+    if (!hasLocalEmoji(reaction)) {
+      if (reactionMap.has(reaction)) {
+        reactionMap.set(reaction, reactionMap.get(reaction) + count);
+      } else {
+        reactionMap.set(reaction, count);
+      }
+      return;
+    }
+    
+    const baseReaction = getBaseReaction(reaction);
+    if (reactionMap.has(baseReaction)) {
+      reactionMap.set(baseReaction, reactionMap.get(baseReaction) + count);
+    } else {
+      reactionMap.set(baseReaction, count);
+    }
+  });
+
+  return Array.from(reactionMap.entries());
+});
+
 if (props.note.myReaction && !Object.keys(reactions.value).includes(props.note.myReaction)) {
 	reactions.value[props.note.myReaction] = props.note.reactions[props.note.myReaction];
 }
 
+onBeforeMount(() => {
+  Object.keys(props.note.reactions).forEach(reaction => {
+    hasLocalEmoji(reaction);
+  });
+});
+
 function onMockToggleReaction(emoji: string, count: number) {
 	if (!mock) return;