diff --git a/CALCKEY.md b/CALCKEY.md
index 4a60466e4d..f977f35aba 100644
--- a/CALCKEY.md
+++ b/CALCKEY.md
@@ -57,6 +57,7 @@
 - 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 56ad95ee94..db35a60b5a 100644
--- a/cypress/e2e/widgets.cy.js
+++ b/cypress/e2e/widgets.cy.js
@@ -61,5 +61,4 @@ 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 4ba09a0343..c5c43bf1a6 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -1,6 +1,6 @@
 ---
 _lang_: "English"
-headlineMisskey: "A network connected by notes"
+headlineMisskey: "An open source, decentralized social media platform that's free forever! 🚀"
 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 1c8fe97858..218d861e5b 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: 'ai',
+			example: 'calc',
 		},
 		host: {
 			type: 'string',
diff --git a/packages/backend/src/server/api/openapi/errors.ts b/packages/backend/src/server/api/openapi/errors.ts
index d7f791c6da..e632b4a0fd 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_AI': {
+		'I_AM_CALC': {
 			value: {
 				error: {
-					message: 'You sent a request to Ai-chan, Misskey\'s showgirl, instead of the server.',
-					code: 'I_AM_AI',
+					message: 'You sent a request to Calc, Calckey\'s resident stoner furry, instead of the server.',
+					code: 'I_AM_CALC',
 					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 5c48373d52..00769d1009 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 Ai',
+					description: 'I\'m Calc',
 					content: {
 						'application/json': {
 							schema: {
diff --git a/packages/client/src/components/sample.vue b/packages/client/src/components/sample.vue
index fddadd6e9a..48c7fe844a 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 Aichan',
+				title: 'Oh my Calc',
 				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 021f19b12a..22b27fad02 100644
--- a/packages/client/src/pages/settings/general.vue
+++ b/packages/client/src/pages/settings/general.vue
@@ -57,7 +57,6 @@
 		</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>
@@ -146,7 +145,6 @@ 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);
@@ -175,7 +173,6 @@ 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 c7b4ee4169..b3aad708d1 100644
--- a/packages/client/src/pages/settings/preferences-backups.vue
+++ b/packages/client/src/pages/settings/preferences-backups.vue
@@ -84,7 +84,6 @@ 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 3b95e65313..1f141b2c15 100644
--- a/packages/client/src/store.ts
+++ b/packages/client/src/store.ts
@@ -247,10 +247,6 @@ 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 c42407f5b0..3c2ca8e5d8 100644
--- a/packages/client/src/ui/classic.vue
+++ b/packages/client/src/ui/classic.vue
@@ -34,8 +34,6 @@
 		<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>
@@ -146,28 +144,6 @@ 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
deleted file mode 100644
index 828490fd9c..0000000000
--- a/packages/client/src/widgets/aichan.vue
+++ /dev/null
@@ -1,74 +0,0 @@
-<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 66bec7c83f..82d0f5ec8e 100644
--- a/packages/client/src/widgets/index.ts
+++ b/packages/client/src/widgets/index.ts
@@ -22,7 +22,6 @@ 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 = [
@@ -47,5 +46,4 @@ export const widgets = [
 	'jobQueue',
 	'button',
 	'aiscript',
-	'aichan',
 ];