diff --git a/CALCKEY.md b/CALCKEY.md
index b05d4064d..7ab6f1f94 100644
--- a/CALCKEY.md
+++ b/CALCKEY.md
@@ -57,7 +57,6 @@
 - Quotes have solid border
 - Reply limit bug fixed
 - Make showing the update popup optional
-- Obliteration of Ai-chan
 - [Make showing ads optional](https://github.com/misskey-dev/misskey/pull/8996)
 - [OAuth bearer token authentication](https://github.com/misskey-dev/misskey/pull/9021)
 - [Styled Repair Tools](https://github.com/misskey-dev/misskey/pull/8956)
diff --git a/cypress/e2e/widgets.cy.js b/cypress/e2e/widgets.cy.js
index db35a60b5..56ad95ee9 100644
--- a/cypress/e2e/widgets.cy.js
+++ b/cypress/e2e/widgets.cy.js
@@ -61,4 +61,5 @@ describe('After user signed in', () => {
 	buildWidgetTest('jobQueue');
 	buildWidgetTest('button');
 	buildWidgetTest('aiscript');
+	buildWidgetTest('aichan');
 });
diff --git a/locales/en-US.yml b/locales/en-US.yml
index f64a7c20d..212e49e4e 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -1,6 +1,6 @@
 ---
 _lang_: "English"
-headlineMisskey: "An open source, decentralized social media platform that's free forever! 🚀"
+headlineMisskey: "A network connected by notes"
 introMisskey: "Welcome! Calckey is an open source, decentralized microblogging service.\nCreate \"notes\" to share your thoughts with everyone around you. 📡\nWith \"reactions\", you can also quickly express your feelings about everyone's notes. 👍\nLet's explore a new world! 🚀"
 monthAndDay: "{month}/{day}"
 search: "Search"
diff --git a/packages/backend/src/models/schema/user.ts b/packages/backend/src/models/schema/user.ts
index 218d861e5..1c8fe9785 100644
--- a/packages/backend/src/models/schema/user.ts
+++ b/packages/backend/src/models/schema/user.ts
@@ -15,7 +15,7 @@ export const packedUserLiteSchema = {
 		username: {
 			type: 'string',
 			nullable: false, optional: false,
-			example: 'calc',
+			example: 'ai',
 		},
 		host: {
 			type: 'string',
diff --git a/packages/backend/src/server/api/openapi/errors.ts b/packages/backend/src/server/api/openapi/errors.ts
index e632b4a0f..d7f791c6d 100644
--- a/packages/backend/src/server/api/openapi/errors.ts
+++ b/packages/backend/src/server/api/openapi/errors.ts
@@ -34,11 +34,11 @@ export const errors = {
 		},
 	},
 	'418': {
-		'I_AM_CALC': {
+		'I_AM_AI': {
 			value: {
 				error: {
-					message: 'You sent a request to Calc, Calckey\'s resident stoner furry, instead of the server.',
-					code: 'I_AM_CALC',
+					message: 'You sent a request to Ai-chan, Misskey\'s showgirl, instead of the server.',
+					code: 'I_AM_AI',
 					id: '60c46cd1-f23a-46b1-bebe-5d2b73951a84',
 				},
 			},
diff --git a/packages/backend/src/server/api/openapi/gen-spec.ts b/packages/backend/src/server/api/openapi/gen-spec.ts
index 00769d100..5c48373d5 100644
--- a/packages/backend/src/server/api/openapi/gen-spec.ts
+++ b/packages/backend/src/server/api/openapi/gen-spec.ts
@@ -156,7 +156,7 @@ export function genOpenapiSpec() {
 					},
 				},
 				'418': {
-					description: 'I\'m Calc',
+					description: 'I\'m Ai',
 					content: {
 						'application/json': {
 							schema: {
diff --git a/packages/client/src/components/sample.vue b/packages/client/src/components/sample.vue
index 48c7fe844..fddadd6e9 100644
--- a/packages/client/src/components/sample.vue
+++ b/packages/client/src/components/sample.vue
@@ -59,7 +59,7 @@ export default defineComponent({
 		async openDialog() {
 			os.alert({
 				type: 'warning',
-				title: 'Oh my Calc',
+				title: 'Oh my Aichan',
 				text: 'Lorem ipsum dolor sit amet, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.',
 			});
 		},
diff --git a/packages/client/src/pages/settings/general.vue b/packages/client/src/pages/settings/general.vue
index 22b27fad0..021f19b12 100644
--- a/packages/client/src/pages/settings/general.vue
+++ b/packages/client/src/pages/settings/general.vue
@@ -57,6 +57,7 @@
 		</FormSwitch>
 		<FormSwitch v-model="disableDrawer" class="_formBlock">{{ i18n.ts.disableDrawer }}</FormSwitch>
 		<FormSwitch v-model="showUpdates" class="_formBlock">{{ i18n.ts.showUpdates }}</FormSwitch>
+		<FormSwitch v-model="aiChanMode">{{ i18n.ts.aiChanMode }}</FormSwitch>
 
 		<FormRadios v-model="fontSize" class="_formBlock">
 			<template #label>{{ i18n.ts.fontSize }}</template>
@@ -145,6 +146,7 @@ const enterSendsMessage = computed(defaultStore.makeGetterSetter('enterSendsMess
 const useReactionPickerForContextMenu = computed(defaultStore.makeGetterSetter('useReactionPickerForContextMenu'));
 const squareAvatars = computed(defaultStore.makeGetterSetter('squareAvatars'));
 const showUpdates = computed(defaultStore.makeGetterSetter('showUpdates'));
+const aiChanMode = computed(defaultStore.makeGetterSetter('aiChanMode'));
 
 watch(lang, () => {
 	localStorage.setItem('lang', lang.value as string);
@@ -173,6 +175,7 @@ watch([
 	useSystemFont,
 	enableInfiniteScroll,
 	squareAvatars,
+	aiChanMode,
 	showGapBetweenNotesInTimeline,
 	instanceTicker,
 	overridedDeviceKind,
diff --git a/packages/client/src/pages/settings/preferences-backups.vue b/packages/client/src/pages/settings/preferences-backups.vue
index b3aad708d..c7b4ee416 100644
--- a/packages/client/src/pages/settings/preferences-backups.vue
+++ b/packages/client/src/pages/settings/preferences-backups.vue
@@ -84,6 +84,7 @@ const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
 	'squareAvatars',
 	'numberOfPageCache',
 	'showUpdates',
+	'aiChanMode',
 ];
 const coldDeviceStorageSaveKeys: (keyof typeof ColdDeviceStorage.default)[] = [
 	'lightTheme',
diff --git a/packages/client/src/store.ts b/packages/client/src/store.ts
index 1f141b2c1..3b95e6531 100644
--- a/packages/client/src/store.ts
+++ b/packages/client/src/store.ts
@@ -247,6 +247,10 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: 5,
 	},
+	aiChanMode: {
+		where: 'device',
+		default: false,
+	},
 	enterSendsMessage: {
 		where: 'device',
 		default: true,
diff --git a/packages/client/src/ui/classic.vue b/packages/client/src/ui/classic.vue
index 3c2ca8e5d..c42407f5b 100644
--- a/packages/client/src/ui/classic.vue
+++ b/packages/client/src/ui/classic.vue
@@ -34,6 +34,8 @@
 		<XWidgets v-if="widgetsShowing" class="tray"/>
 	</transition>
 
+	<iframe v-if="$store.state.aiChanMode" ref="live2d" class="ivnzpscs" src="https://misskey-dev.github.io/mascot-web/?scale=2&y=1.4"></iframe>
+
 	<XCommon/>
 </div>
 </template>
@@ -144,6 +146,28 @@ onMounted(() => {
 	window.addEventListener('resize', () => {
 		isDesktop = (window.innerWidth >= DESKTOP_THRESHOLD);
 	}, { passive: true });
+
+	if (defaultStore.state.aiChanMode) {
+		const iframeRect = live2d.getBoundingClientRect();
+		window.addEventListener('mousemove', ev => {
+			live2d.contentWindow.postMessage({
+				type: 'moveCursor',
+				body: {
+					x: ev.clientX - iframeRect.left,
+					y: ev.clientY - iframeRect.top,
+				},
+			}, '*');
+		}, { passive: true });
+		window.addEventListener('touchmove', ev => {
+			live2d.contentWindow.postMessage({
+				type: 'moveCursor',
+				body: {
+					x: ev.touches[0].clientX - iframeRect.left,
+					y: ev.touches[0].clientY - iframeRect.top,
+				},
+			}, '*');
+		}, { passive: true });
+	}
 });
 </script>
 
diff --git a/packages/client/src/widgets/aichan.vue b/packages/client/src/widgets/aichan.vue
new file mode 100644
index 000000000..828490fd9
--- /dev/null
+++ b/packages/client/src/widgets/aichan.vue
@@ -0,0 +1,74 @@
+<template>
+<MkContainer :naked="widgetProps.transparent" :show-header="false" class="mkw-aichan">
+	<iframe ref="live2d" class="dedjhjmo" src="https://misskey-dev.github.io/mascot-web/?scale=1.5&y=1.1&eyeY=100" @click="touched"></iframe>
+</MkContainer>
+</template>
+
+<script lang="ts" setup>
+import { onMounted, onUnmounted, reactive, ref } from 'vue';
+import { useWidgetPropsManager, Widget, WidgetComponentEmits, WidgetComponentExpose, WidgetComponentProps } from './widget';
+import { GetFormResultType } from '@/scripts/form';
+
+const name = 'ai';
+
+const widgetPropsDef = {
+	transparent: {
+		type: 'boolean' as const,
+		default: false,
+	},
+};
+
+type WidgetProps = GetFormResultType<typeof widgetPropsDef>;
+
+// 現時点ではvueの制限によりimportしたtypeをジェネリックに渡せない
+//const props = defineProps<WidgetComponentProps<WidgetProps>>();
+//const emit = defineEmits<WidgetComponentEmits<WidgetProps>>();
+const props = defineProps<{ widget?: Widget<WidgetProps>; }>();
+const emit = defineEmits<{ (ev: 'updateProps', props: WidgetProps); }>();
+
+const { widgetProps, configure } = useWidgetPropsManager(name,
+	widgetPropsDef,
+	props,
+	emit,
+);
+
+const live2d = ref<HTMLIFrameElement>();
+
+const touched = () => {
+	//if (this.live2d) this.live2d.changeExpression('gurugurume');
+};
+
+const onMousemove = (ev: MouseEvent) => {
+	const iframeRect = live2d.value.getBoundingClientRect();
+	live2d.value.contentWindow.postMessage({
+		type: 'moveCursor',
+		body: {
+			x: ev.clientX - iframeRect.left,
+			y: ev.clientY - iframeRect.top,
+		},
+	}, '*');
+};
+
+onMounted(() => {
+	window.addEventListener('mousemove', onMousemove, { passive: true });
+});
+
+onUnmounted(() => {
+	window.removeEventListener('mousemove', onMousemove);
+});
+
+defineExpose<WidgetComponentExpose>({
+	name,
+	configure,
+	id: props.widget ? props.widget.id : null,
+});
+</script>
+
+<style lang="scss" scoped>
+.dedjhjmo {
+	width: 100%;
+	height: 350px;
+	border: none;
+	pointer-events: none;
+}
+</style>
diff --git a/packages/client/src/widgets/index.ts b/packages/client/src/widgets/index.ts
index 82d0f5ec8..66bec7c83 100644
--- a/packages/client/src/widgets/index.ts
+++ b/packages/client/src/widgets/index.ts
@@ -22,6 +22,7 @@ export default function(app: App) {
 	app.component('MkwInstanceCloud', defineAsyncComponent(() => import('./instance-cloud.vue')));
 	app.component('MkwButton', defineAsyncComponent(() => import('./button.vue')));
 	app.component('MkwAiscript', defineAsyncComponent(() => import('./aiscript.vue')));
+	app.component('MkwAichan', defineAsyncComponent(() => import('./aichan.vue')));
 }
 
 export const widgets = [
@@ -46,4 +47,5 @@ export const widgets = [
 	'jobQueue',
 	'button',
 	'aiscript',
+	'aichan',
 ];