diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index 66a70c9be3..ab70a11b9b 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -723,6 +723,8 @@ function emitUpdReaction(emoji: string, delta: number) {
 }
 
 .skipRender {
+	// TODO: これが有効だとTransitionGroupでnoteを追加するときに一瞬がくっとなってしまうのをどうにかしたい
+	// Transitionが完了するのを待ってからskipRenderを付与すれば解決しそうだけどパフォーマンス的な影響が不明
 	content-visibility: auto;
 	contain-intrinsic-size: 0 150px;
 }
diff --git a/packages/frontend/src/components/MkNotes.vue b/packages/frontend/src/components/MkNotes.vue
index 8605877a93..ad4844fd1b 100644
--- a/packages/frontend/src/components/MkNotes.vue
+++ b/packages/frontend/src/components/MkNotes.vue
@@ -13,14 +13,22 @@ SPDX-License-Identifier: AGPL-3.0-only
 	</template>
 
 	<template #default="{ items: notes }">
-		<div :class="[$style.root, { [$style.noGap]: noGap, '_gaps': !noGap }]">
+		<component
+			:is="prefer.s.animation ? TransitionGroup : 'div'" :class="[$style.root, { [$style.noGap]: noGap, '_gaps': !noGap }]"
+			:enterActiveClass="$style.transition_x_enterActive"
+			:leaveActiveClass="$style.transition_x_leaveActive"
+			:enterFromClass="$style.transition_x_enterFrom"
+			:leaveToClass="$style.transition_x_leaveTo"
+			:moveClass=" $style.transition_x_move"
+			tag="div"
+		>
 			<template v-for="(note, i) in notes" :key="note.id">
 				<MkNote :class="$style.note" :note="note" :withHardMute="true"/>
 				<div v-if="note._shouldInsertAd_" :class="$style.ad">
 					<MkAd :preferForms="['horizontal', 'horizontal-big']"/>
 				</div>
 			</template>
-		</div>
+		</component>
 	</template>
 </MkPagination>
 </template>
@@ -48,6 +56,20 @@ defineExpose({
 </script>
 
 <style lang="scss" module>
+.transition_x_move,
+.transition_x_enterActive,
+.transition_x_leaveActive {
+	transition: opacity 0.3s cubic-bezier(0,.5,.5,1), transform 0.3s cubic-bezier(0,.5,.5,1) !important;
+}
+.transition_x_enterFrom,
+.transition_x_leaveTo {
+	opacity: 0;
+	transform: translateY(-50%);
+}
+.transition_x_leaveActive {
+	position: absolute;
+}
+
 .root {
 	container-type: inline-size;
 
diff --git a/packages/frontend/src/components/MkNotifications.vue b/packages/frontend/src/components/MkNotifications.vue
index a8282fec2a..99eca35eb7 100644
--- a/packages/frontend/src/components/MkNotifications.vue
+++ b/packages/frontend/src/components/MkNotifications.vue
@@ -14,19 +14,27 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</template>
 
 		<template #default="{ items: notifications }">
-			<div :class="$style.notifications">
+			<component
+				:is="prefer.s.animation ? TransitionGroup : 'div'" :class="[$style.notifications]"
+				:enterActiveClass="$style.transition_x_enterActive"
+				:leaveActiveClass="$style.transition_x_leaveActive"
+				:enterFromClass="$style.transition_x_enterFrom"
+				:leaveToClass="$style.transition_x_leaveTo"
+				:moveClass=" $style.transition_x_move"
+				tag="div"
+			>
 				<template v-for="(notification, i) in notifications" :key="notification.id">
 					<MkNote v-if="['reply', 'quote', 'mention'].includes(notification.type)" :class="$style.item" :note="notification.note" :withHardMute="true"/>
 					<XNotification v-else :class="$style.item" :notification="notification" :withTime="true" :full="true"/>
 				</template>
-			</div>
+			</component>
 		</template>
 	</MkPagination>
 </MkPullToRefresh>
 </template>
 
 <script lang="ts" setup>
-import { onUnmounted, onDeactivated, onMounted, computed, useTemplateRef, onActivated } from 'vue';
+import { onUnmounted, onMounted, computed, useTemplateRef, TransitionGroup } from 'vue';
 import * as Misskey from 'misskey-js';
 import type { notificationTypes } from '@@/js/const.js';
 import MkPagination from '@/components/MkPagination.vue';
@@ -95,6 +103,20 @@ defineExpose({
 </script>
 
 <style lang="scss" module>
+.transition_x_move,
+.transition_x_enterActive,
+.transition_x_leaveActive {
+	transition: opacity 0.3s cubic-bezier(0,.5,.5,1), transform 0.3s cubic-bezier(0,.5,.5,1) !important;
+}
+.transition_x_enterFrom,
+.transition_x_leaveTo {
+	opacity: 0;
+	transform: translateY(-50%);
+}
+.transition_x_leaveActive {
+	position: absolute;
+}
+
 .notifications {
 	container-type: inline-size;
 	background: var(--MI_THEME-panel);