diff --git a/locales/en-US.yml b/locales/en-US.yml
index b153a7d5b6..d409208eb8 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -1,8 +1,6 @@
 ---
 _lang_: "English"
 cannotBeUsedFunc: "This feature is currently unavailable."
-maxinumLayerError: "You cannot stack more than 6 layers. Please delete other layers."
-layer: "Layer"
 Xcoordinate: "X-Coordinate"
 Ycoordinate: "Y-Coordinate"
 scale: "Scale"
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 0d3e3d1396..b485da89a1 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1,8 +1,6 @@
 _lang_: "日本語"
 
 cannotBeUsedFunc: "この機能は現在使用できません。"
-maxinumLayerError: "6枚以上重ねることはできません。他のレイヤーを削除してください。"
-layer: "レイヤー"
 Xcoordinate: "X座標"
 Ycoordinate: "Y座標"
 scale: "大きさ"
diff --git a/locales/ja-KS.yml b/locales/ja-KS.yml
index 8fb6574f01..2950dc0b25 100644
--- a/locales/ja-KS.yml
+++ b/locales/ja-KS.yml
@@ -1,7 +1,5 @@
 ---
 _lang_: "日本語 (関西弁)"
-maxinumLayerError: "6枚以上重ねられんで。他のレイヤーを削除してなー"
-layer: "レイヤー"
 headlineMisskey: "ノートでつながるネットワーク"
 introMisskey: "ようお越し！CherryPickは、オープンソースの分散型マイクロブログサービスやねん。\n「ノート」を作って、いま起こっとることを共有したり、あんたについて皆に発信しよう📡\n「ツッコミ」機能で、皆のノートに素早く反応を追加したりもできるで✌\nほな、新しい世界を探検しよか🚀"
 poweredByMisskeyDescription: "{name}は、オープンソースのプラットフォーム<b>CherryPick</b>のサーバーのひとつなんやで。"
diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index d712c3a0b4..b023df70c3 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -137,7 +137,7 @@ export const paramDef = {
 		birthday: { ...birthdaySchema, nullable: true },
 		lang: { type: 'string', enum: [null, ...Object.keys(langmap)] as string[], nullable: true },
 		avatarId: { type: 'string', format: 'misskey:id', nullable: true },
-		avatarDecorations: { type: 'array', maxItems: 5, items: {
+		avatarDecorations: { type: 'array', maxItems: 1, items: {
 			type: 'object',
 			properties: {
 				id: { type: 'string', format: 'misskey:id' },
diff --git a/packages/frontend/src/pages/settings/profile.avatar-decoration-dialog.vue b/packages/frontend/src/pages/settings/profile.avatar-decoration-dialog.vue
index c8f2b4a9f0..2e133888ca 100644
--- a/packages/frontend/src/pages/settings/profile.avatar-decoration-dialog.vue
+++ b/packages/frontend/src/pages/settings/profile.avatar-decoration-dialog.vue
@@ -20,14 +20,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkAvatar style="width: 64px; height: 64px; margin-bottom: 20px;" :user="$i" :decoration="{ url: decoration.url, angle, flipH, scale, moveX, moveY, opacity }" forceShowDecoration/>
 			</div>
 			<div class="_gaps_s">
-				<MkRadios v-model="insertLayer">
-					<template #label>{{ i18n.ts.layer }}</template>
-					<option value="0">1</option>
-					<option value="1">2</option>
-					<option value="2">3</option>
-					<option value="3">4</option>
-					<option value="4">5</option>
-				</MkRadios>
 				<MkRange v-model="angle" continuousUpdate :min="-0.5" :max="0.5" :step="0.025" :textConverter="(v) => `${Math.floor(v * 360)}°`">
 					<template #label>{{ i18n.ts.angle }}</template>
 				</MkRange>
@@ -61,7 +53,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { shallowRef, ref, computed } from 'vue';
 import MkButton from '@/components/MkButton.vue';
-import MkRadios from '@/components/MkRadios.vue';
 import MkModalWindow from '@/components/MkModalWindow.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import { i18n } from '@/i18n.js';
@@ -84,18 +75,6 @@ const emit = defineEmits<{
 
 const dialog = shallowRef<InstanceType<typeof MkModalWindow>>();
 const using = computed(() => $i.avatarDecorations.some(x => x.id === props.decoration.id));
-const layerNum = (() => {
-	let result = -1;
-	$i.avatarDecorations.some((x, i) => {
-		if (x.id === props.decoration.id) {
-			result = i;
-			return true;
-		}
-		return false;
-	});
-	return result;
-})();
-const insertLayer = ref(layerNum === -1 ? String($i.avatarDecorations.length) : String(layerNum));
 const angle = ref(using.value ? $i.avatarDecorations.find(x => x.id === props.decoration.id).angle ?? 0 : 0);
 const flipH = ref(using.value ? $i.avatarDecorations.find(x => x.id === props.decoration.id).flipH ?? false : false);
 const scale = ref(using.value ? $i.avatarDecorations.find(x => x.id === props.decoration.id).scale ?? 1 : 1);
@@ -117,22 +96,19 @@ async function attach() {
 		moveY: moveY.value,
 		opacity: opacity.value,
 	};
-	const updatedDecorations = $i.avatarDecorations.toSpliced(layerNum, layerNum === -1 ? 0 : 1).toSpliced(Number(insertLayer.value), 0, decoration);
 	await os.apiWithDialog('i/update', {
-		avatarDecorations: updatedDecorations,
+		avatarDecorations: [decoration],
 	});
-	$i.avatarDecorations = updatedDecorations;
+	$i.avatarDecorations = [decoration];
 
 	dialog.value.close();
 }
 
 async function detach() {
-	if (layerNum === -1) return;
-	const deletedDecorations = $i.avatarDecorations.toSpliced(layerNum, 1);
 	await os.apiWithDialog('i/update', {
-		avatarDecorations: deletedDecorations,
+		avatarDecorations: [],
 	});
-	$i.avatarDecorations = deletedDecorations;
+	$i.avatarDecorations = [];
 
 	dialog.value.close();
 }
diff --git a/packages/frontend/src/pages/settings/profile.vue b/packages/frontend/src/pages/settings/profile.vue
index 330edb8f23..fd9b9b3f99 100644
--- a/packages/frontend/src/pages/settings/profile.vue
+++ b/packages/frontend/src/pages/settings/profile.vue
@@ -97,7 +97,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<div :class="$style.avatarDecorationName"><MkCondensedLine :minScale="0.5">{{ avatarDecoration.name }}</MkCondensedLine></div>
 				<MkAvatar style="width: 60px; height: 60px;" :user="$i" :decoration="{ url: avatarDecoration.url }" forceShowDecoration/>
 				<i v-if="avatarDecoration.roleIdsThatCanBeUsedThisDecoration.length > 0 && !$i.roles.some(r => avatarDecoration.roleIdsThatCanBeUsedThisDecoration.includes(r.id))" :class="$style.avatarDecorationLock" class="ti ti-lock"></i>
-				<span v-if="$i.avatarDecorations.some(x => x.id === avatarDecoration.id)" :class="$style.layerNum">{{ indexOfDecoration(v => v.id === avatarDecoration.id) + 1 }}</span>
 			</div>
 		</div>
 	</MkFolder>
@@ -164,18 +163,6 @@ watch(() => profile, () => {
 	deep: true,
 });
 
-function indexOfDecoration(f) {
-	let result = -1;
-	$i.avatarDecorations.some((e, i) => {
-		if (f(e)) {
-			result = i;
-			return true;
-		}
-		return false;
-	});
-	return result;
-}
-
 const fields = ref($i?.fields.map(field => ({ id: Math.random().toString(), name: field.name, value: field.value })) ?? []);
 const fieldEditMode = ref(false);
 
@@ -293,14 +280,6 @@ function changeBanner(ev) {
 }
 
 function openDecoration(avatarDecoration) {
-	if (indexOfDecoration(v => v.id === avatarDecoration.id) === -1 && $i.avatarDecorations.length >= 5) {
-		os.alert({
-			type: 'error',
-			title: i18n.ts.error,
-			text: i18n.ts.maxinumLayerError,
-		});
-		return;
-	}
 	os.popup(defineAsyncComponent(() => import('./profile.avatar-decoration-dialog.vue')), {
 		decoration: avatarDecoration,
 	}, {}, 'closed');
@@ -439,16 +418,4 @@ definePageMetadata({
 	bottom: 12px;
 	right: 12px;
 }
-
-.layerNum {
-	position: absolute;
-	left: 0;
-	top: 0;
-	margin: 10px;
-	color: var(--accent);
-	border: solid 1px var(--accent);
-	padding: 0 5px;
-	border-radius: 4px;
-	font-weight: bold;
-}
 </style>