diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ec4ae4fec239d6782ff1a4509b815f5a566fe59..8612220c869277e5878f9f020fe78ccd936f8dea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,13 @@
 -
 
 ### Client
--
+-　「にゃああああああああああああああ！！！！！！！！！！！！」 (`isCat`) 有効時にアバターに表示される猫耳について挙動を変更
+  - 「UIにぼかし効果を使用」 (`useBlurEffect`) で次の挙動が有効になります
+	  - 猫耳のアバター内部部分をぼかしでマスク表示してより猫耳っぽく見えるように
+		- 猫耳の色がアバター上部のピクセルから決定されます（無効化時はアバター全体の平均色）
+		  - 左耳は上からおよそ 10%, 左からおよそ 20% の位置で決定します
+			- 右耳は上からおよそ 10%, 左からおよそ 80% の位置で決定します
+	- 「UIのアニメーションを減らす」 (`reduceAnimation`) で猫耳を撫でられなくなります
 
 ### Server
 -
diff --git a/packages/frontend/src/components/global/MkAvatar.vue b/packages/frontend/src/components/global/MkAvatar.vue
index 814ab53d27197b6064a44238853406c3653e2bef..9a21941c8d84db60df7c8d1751b1e1cf4d6013f0 100644
--- a/packages/frontend/src/components/global/MkAvatar.vue
+++ b/packages/frontend/src/components/global/MkAvatar.vue
@@ -1,5 +1,5 @@
 <template>
-<component :is="link ? MkA : 'span'" v-user-preview="preview ? user.id : undefined" v-bind="bound" class="_noSelect" :class="[$style.root, { [$style.cat]: user.isCat, [$style.square]: squareAvatars }]" :style="{ color }" :title="acct(user)" @click="onClick">
+<component :is="link ? MkA : 'span'" v-user-preview="preview ? user.id : undefined" v-bind="bound" class="_noSelect" :class="[$style.root, { [$style.animation]: animation, [$style.cat]: user.isCat, [$style.square]: squareAvatars }]" :style="{ color }" :title="acct(user)" @click="onClick">
 	<img :class="$style.inner" :src="url" decoding="async"/>
 	<MkUserOnlineIndicator v-if="indicator" :class="$style.indicator" :user="user"/>
 	<div v-if="user.isCat" :class="[$style.ears, { [$style.mask]: useBlurEffect }]">
@@ -27,6 +27,7 @@ import { acct, userPage } from '@/filters/user';
 import MkUserOnlineIndicator from '@/components/MkUserOnlineIndicator.vue';
 import { defaultStore } from '@/store';
 
+const animation = $ref(defaultStore.state.animation);
 const squareAvatars = $ref(defaultStore.state.squareAvatars);
 const useBlurEffect = $ref(defaultStore.state.useBlurEffect);
 
@@ -86,6 +87,18 @@ watch(() => props.user.avatarBlurhash, () => {
 	to { transform: rotate(-37.6deg) skew(-30deg); }
 }
 
+@keyframes eartightleft {
+	from { transform: rotate(37.6deg) skew(30deg); }
+	50% { transform: rotate(37.4deg) skew(30deg); }
+	to { transform: rotate(37.6deg) skew(30deg); }
+}
+
+@keyframes eartightright {
+	from { transform: rotate(-37.6deg) skew(-30deg); }
+	50% { transform: rotate(-37.4deg) skew(-30deg); }
+	to { transform: rotate(-37.6deg) skew(-30deg); }
+}
+
 .root {
 	position: relative;
 	display: inline-block;
@@ -144,6 +157,14 @@ watch(() => props.user.avatarBlurhash, () => {
 			mask:
 				url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32"><filter id="a"><feGaussianBlur in="SourceGraphic" stdDeviation="1"/></filter><circle cx="16" cy="16" r="15" filter="url(%23a)"/></svg>') exclude center / 50% 50%,
 				linear-gradient(#fff, #fff); // polyfill of `image(#fff)`
+
+			> .earLeft {
+				animation: eartightleft 6s infinite;
+			}
+
+			> .earRight {
+				animation: eartightright 6s infinite;
+			}
 		}
 
 		> .earLeft,
@@ -225,7 +246,7 @@ watch(() => props.user.avatarBlurhash, () => {
 		}
 	}
 
-	&:hover {
+	&.animation:hover {
 		> .ears {
 			> .earLeft {
 				animation: earwiggleleft 1s infinite;
diff --git a/packages/frontend/src/components/global/MkPageHeader.vue b/packages/frontend/src/components/global/MkPageHeader.vue
index 0d229a937072df1d872e0c00ae4dcb6cfdc7b150..710edd797ae5e8615338e4af78df85ccc83ee393 100644
--- a/packages/frontend/src/components/global/MkPageHeader.vue
+++ b/packages/frontend/src/components/global/MkPageHeader.vue
@@ -8,7 +8,9 @@
 
 		<template v-if="metadata">
 			<div v-if="!hideTitle" :class="$style.titleContainer" @click="top">
-				<MkAvatar v-if="metadata.avatar" :class="$style.titleAvatar" :user="metadata.avatar" indicator/>
+				<div v-if="metadata.avatar" :class="$style.titleAvatarContainer">
+					<MkAvatar :class="$style.titleAvatar" :user="metadata.avatar" indicator/>
+				</div>
 				<i v-else-if="metadata.icon" :class="[$style.titleIcon, metadata.icon]"></i>
 
 				<div :class="$style.title">
@@ -249,13 +251,19 @@ onUnmounted(() => {
 	margin-left: 24px;
 }
 
-.titleAvatar {
+.titleAvatarContainer {
 	$size: 32px;
-	display: inline-block;
+	contain: strict;
+	overflow: clip;
 	width: $size;
 	height: $size;
-	vertical-align: bottom;
-	margin: 0 8px;
+	padding: 8px;
+	flex-shrink: 0;
+}
+
+.titleAvatar {
+	width: 100%;
+	height: 100%;
 	pointer-events: none;
 }