diff --git a/CHANGELOG_yojo.md b/CHANGELOG_yojo.md
index b0fdb9407c..bf6703e571 100644
--- a/CHANGELOG_yojo.md
+++ b/CHANGELOG_yojo.md
@@ -21,7 +21,7 @@
 ### Release Date
 
 ### General
--
+- 連合過激派によってローカルのみ投稿機能は削除されました
 
 ### Client
 -
diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index fe5dfbd1e2..662aa4580a 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -143,7 +143,6 @@ export const paramDef = {
 			type: 'string', format: 'misskey:id',
 		} },
 		cw: { type: 'string', nullable: true, minLength: 1, maxLength: 100 },
-		localOnly: { type: 'boolean', default: false },
 		reactionAcceptance: { type: 'string', nullable: true, enum: [null, 'likeOnly', 'likeOnlyForRemote', 'nonSensitiveOnly', 'nonSensitiveOnlyForLocalLikeOnlyForRemote'], default: null },
 		disableRightClick: { type: 'boolean', default: false },
 		noExtractMentions: { type: 'boolean', default: false },
@@ -364,14 +363,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				}
 			}
 
-			let channel: MiChannel | null = null;
-			if (ps.channelId != null) {
-				channel = await this.channelsRepository.findOneBy({ id: ps.channelId, isArchived: false });
-
-				if (channel == null) {
-					throw new ApiError(meta.errors.noSuchChannel);
-				}
-			}
+			const channel: MiChannel | null = null;
 
 			// 投稿を作成
 			try {
@@ -393,7 +385,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 						metadata: ps.event.metadata ?? {},
 					} : undefined,
 					cw: ps.cw,
-					localOnly: ps.localOnly,
+					localOnly: false,
 					reactionAcceptance: ps.reactionAcceptance,
 					disableRightClick: ps.disableRightClick,
 					visibility: ps.visibility,
diff --git a/packages/cherrypick-js/src/autogen/types.ts b/packages/cherrypick-js/src/autogen/types.ts
index 08aec978fc..05c02895b5 100644
--- a/packages/cherrypick-js/src/autogen/types.ts
+++ b/packages/cherrypick-js/src/autogen/types.ts
@@ -21727,8 +21727,6 @@ export type operations = {
           visibility?: 'public' | 'home' | 'followers' | 'specified';
           visibleUserIds?: string[];
           cw?: string | null;
-          /** @default false */
-          localOnly?: boolean;
           /**
            * @default null
            * @enum {string|null}
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 406572fb10..1bdc94c364 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -32,10 +32,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<span :class="$style.headerRightButtonText">{{ channel.name }}</span>
 				</button>
 			</template>
-			<button v-click-anime v-tooltip="i18n.ts._visibility.disableFederation" class="_button" :class="[$style.headerRightItem, { [$style.danger]: localOnly }]" :disabled="channel != null || visibility === 'specified'" @click="toggleLocalOnly">
-				<span v-if="!localOnly"><i class="ti ti-rocket"></i></span>
-				<span v-else><i class="ti ti-rocket-off"></i></span>
-			</button>
 			<button v-click-anime v-tooltip="i18n.ts.reactionAcceptance" class="_button" :class="[$style.headerRightItem, { [$style.danger]: reactionAcceptance === 'likeOnly' }]" @click="toggleReactionAcceptance">
 				<span v-if="reactionAcceptance === 'likeOnly'"><i class="ti ti-heart"></i></span>
 				<span v-else-if="reactionAcceptance === 'likeOnlyForRemote'"><i class="ti ti-heart-plus"></i></span>
@@ -151,7 +147,6 @@ const props = withDefaults(defineProps<{
 	initialCw?: string;
 	initialVisibility?: (typeof Misskey.noteVisibilities)[number];
 	initialFiles?: Misskey.entities.DriveFile[];
-	initialLocalOnly?: boolean;
 	initialVisibleUsers?: Misskey.entities.UserDetailed[];
 	initialNote?: Misskey.entities.Note;
 	instant?: boolean;
@@ -164,7 +159,6 @@ const props = withDefaults(defineProps<{
 	initialVisibleUsers: () => [],
 	autofocus: true,
 	mock: false,
-	initialLocalOnly: undefined,
 });
 
 provide('mock', props.mock);
@@ -202,7 +196,6 @@ watch(showProfilePreview, () => defaultStore.set('showProfilePreview', showProfi
 const showAddMfmFunction = ref(defaultStore.state.enableQuickAddMfmFunction);
 watch(showAddMfmFunction, () => defaultStore.set('enableQuickAddMfmFunction', showAddMfmFunction.value));
 const cw = ref<string | null>(props.initialCw ?? null);
-const localOnly = ref(props.initialLocalOnly ?? (defaultStore.state.rememberNoteVisibility ? defaultStore.state.localOnly : defaultStore.state.defaultNoteLocalOnly));
 const visibility = ref(props.initialVisibility ?? (defaultStore.state.rememberNoteVisibility ? defaultStore.state.visibility : defaultStore.state.defaultNoteVisibility));
 const visibleUsers = ref<Misskey.entities.UserDetailed[]>([]);
 if (props.initialVisibleUsers) {
@@ -341,11 +334,6 @@ if ($i.isSilenced && visibility.value === 'public') {
 	visibility.value = 'home';
 }
 
-if (props.channel) {
-	visibility.value = 'public';
-	localOnly.value = true; // TODO: チャンネルが連合するようになった折には消す
-}
-
 // 公開以外へのリプライ時は元の公開範囲を引き継ぐ
 if (props.reply && ['home', 'followers', 'specified'].includes(props.reply.visibility)) {
 	if (props.reply.visibility === 'home' && visibility.value === 'followers') {
@@ -393,7 +381,6 @@ function watchForDraft() {
 	watch(event, () => saveDraft());
 	watch(files, () => saveDraft(), { deep: true });
 	watch(visibility, () => saveDraft());
-	watch(localOnly, () => saveDraft());
 }
 
 function checkMissingMention() {
@@ -497,16 +484,9 @@ function upload(file: File, name?: string): void {
 }
 
 function setVisibility() {
-	if (props.channel) {
-		visibility.value = 'public';
-		localOnly.value = true; // TODO: チャンネルが連合するようになった折には消す
-		return;
-	}
-
 	os.popup(defineAsyncComponent(() => import('@/components/MkVisibilityPicker.vue')), {
 		currentVisibility: visibility.value,
 		isSilenced: $i.isSilenced,
-		localOnly: localOnly.value,
 		src: visibilityButton.value,
 		...(props.reply ? { isReplyVisibilitySpecified: props.reply.visibility === 'specified' } : {}),
 	}, {
@@ -519,51 +499,6 @@ function setVisibility() {
 	}, 'closed');
 }
 
-async function toggleLocalOnly() {
-	if (props.channel) {
-		visibility.value = 'public';
-		localOnly.value = true; // TODO: チャンネルが連合するようになった折には消す
-		return;
-	}
-
-	const neverShowInfo = miLocalStorage.getItem('neverShowLocalOnlyInfo');
-
-	if (!localOnly.value && neverShowInfo !== 'true') {
-		const confirm = await os.actions({
-			type: 'question',
-			title: i18n.ts.disableFederationConfirm,
-			text: i18n.ts.disableFederationConfirmWarn,
-			actions: [
-				{
-					value: 'yes' as const,
-					text: i18n.ts.disableFederationOk,
-					primary: true,
-				},
-				{
-					value: 'neverShow' as const,
-					text: `${i18n.ts.disableFederationOk} (${i18n.ts.neverShow})`,
-					danger: true,
-				},
-				{
-					value: 'no' as const,
-					text: i18n.ts.cancel,
-				},
-			],
-		});
-		if (confirm.canceled) return;
-		if (confirm.result === 'no') return;
-
-		if (confirm.result === 'neverShow') {
-			miLocalStorage.setItem('neverShowLocalOnlyInfo', 'true');
-		}
-	}
-
-	localOnly.value = !localOnly.value;
-	if (defaultStore.state.rememberNoteVisibility) {
-		defaultStore.set('localOnly', localOnly.value);
-	}
-}
-
 async function toggleReactionAcceptance() {
 	const select = await os.select({
 		title: i18n.ts.reactionAcceptance,
@@ -620,7 +555,6 @@ function onKeydown(ev: KeyboardEvent) {
 		else if (ev.ctrlKey && ev.shiftKey && (visibility.value === 'public')) visibility.value = 'home';
 		else if (ev.ctrlKey && ev.shiftKey && (visibility.value === 'home')) visibility.value = 'followers';
 		else if (ev.ctrlKey && ev.shiftKey && (visibility.value === 'followers')) visibility.value = 'specified';
-		if ((ev.ctrlKey || ev.metaKey) && ev.altKey) localOnly.value = !localOnly.value;
 	}
 
 	if (ev.key === 'Escape') emit('esc');
@@ -752,7 +686,6 @@ function saveDraft() {
 			cw: cw.value,
 			disableRightClick: disableRightClick.value,
 			visibility: visibility.value,
-			localOnly: localOnly.value,
 			files: files.value,
 			poll: poll.value,
 			event: event.value,
@@ -833,7 +766,6 @@ async function post(ev?: MouseEvent) {
 		poll: poll.value,
 		event: event.value,
 		cw: useCw.value ? cw.value ?? '' : null,
-		localOnly: localOnly.value,
 		visibility: visibility.value,
 		visibleUserIds: visibility.value === 'specified' ? visibleUsers.value.map(u => u.id) : undefined,
 		reactionAcceptance: reactionAcceptance.value,
@@ -956,7 +888,7 @@ function cancel() {
 }
 
 function insertMention() {
-	os.selectUser({ localOnly: localOnly.value, includeSelf: true }).then(user => {
+	os.selectUser({ localOnly: false, includeSelf: true }).then(user => {
 		insertTextAtCursor(textareaEl.value, '@' + Misskey.acct.toString(user) + ' ');
 	});
 }
@@ -1063,7 +995,6 @@ onMounted(() => {
 				cw.value = draft.data.cw;
 				disableRightClick.value = draft.data.disableRightClick;
 				visibility.value = draft.data.visibility;
-				localOnly.value = draft.data.localOnly;
 				files.value = (draft.data.files || []).filter(draftFile => draftFile);
 				if (draft.data.poll) {
 					poll.value = draft.data.poll;
@@ -1103,7 +1034,6 @@ onMounted(() => {
 				};
 			}
 			visibility.value = init.visibility;
-			localOnly.value = init.localOnly ?? false;
 			quoteId.value = init.renote ? init.renote.id : null;
 			disableRightClick.value = init.disableRightClick != null;
 		}
diff --git a/packages/frontend/src/components/MkPostFormDialog.vue b/packages/frontend/src/components/MkPostFormDialog.vue
index 2b13bf16b2..ed5693bcb1 100644
--- a/packages/frontend/src/components/MkPostFormDialog.vue
+++ b/packages/frontend/src/components/MkPostFormDialog.vue
@@ -25,7 +25,6 @@ const props = withDefaults(defineProps<{
 	initialCw?: string;
 	initialVisibility?: (typeof Misskey.noteVisibilities)[number];
 	initialFiles?: Misskey.entities.DriveFile[];
-	initialLocalOnly?: boolean;
 	initialVisibleUsers?: Misskey.entities.UserDetailed[];
 	initialNote?: Misskey.entities.Note;
 	instant?: boolean;
@@ -33,7 +32,6 @@ const props = withDefaults(defineProps<{
 	autofocus?: boolean;
 	updateMode?: boolean;
 }>(), {
-	initialLocalOnly: undefined,
 });
 
 const emit = defineEmits<{
diff --git a/packages/frontend/src/components/MkPostFormSimple.vue b/packages/frontend/src/components/MkPostFormSimple.vue
index 9e84459546..a1cab2ba9d 100644
--- a/packages/frontend/src/components/MkPostFormSimple.vue
+++ b/packages/frontend/src/components/MkPostFormSimple.vue
@@ -36,10 +36,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<span :class="$style.headerRightButtonText">{{ channel.name }}</span>
 					</button>
 				</template>
-				<button v-click-anime v-tooltip="i18n.ts._visibility.disableFederation" class="_button" :class="[$style.headerRightItem, { [$style.danger]: localOnly }]" :disabled="channel != null || visibility === 'specified'" @click="toggleLocalOnly">
-					<span v-if="!localOnly"><i class="ti ti-rocket"></i></span>
-					<span v-else><i class="ti ti-rocket-off"></i></span>
-				</button>
 				<button v-click-anime v-tooltip="i18n.ts.reactionAcceptance" class="_button" :class="[$style.headerRightItem, { [$style.danger]: reactionAcceptance === 'likeOnly' }]" @click="toggleReactionAcceptance">
 					<span v-if="reactionAcceptance === 'likeOnly'"><i class="ti ti-heart"></i></span>
 					<span v-else-if="reactionAcceptance === 'likeOnlyForRemote'"><i class="ti ti-heart-plus"></i></span>
@@ -168,7 +164,6 @@ const props = withDefaults(defineProps<{
 	initialCw?: string;
 	initialVisibility?: (typeof Misskey.noteVisibilities)[number];
 	initialFiles?: Misskey.entities.DriveFile[];
-	initialLocalOnly?: boolean;
 	initialVisibleUsers?: Misskey.entities.UserDetailed[];
 	initialNote?: Misskey.entities.Note;
 	instant?: boolean;
@@ -220,7 +215,6 @@ watch(showProfilePreview, () => defaultStore.set('showProfilePreview', showProfi
 const showAddMfmFunction = ref(defaultStore.state.enableQuickAddMfmFunction);
 watch(showAddMfmFunction, () => defaultStore.set('enableQuickAddMfmFunction', showAddMfmFunction.value));
 const cw = ref<string | null>(props.initialCw ?? null);
-const localOnly = ref<boolean>(props.initialLocalOnly ?? defaultStore.state.rememberNoteVisibility ? defaultStore.state.localOnly : defaultStore.state.defaultNoteLocalOnly);
 const visibility = ref(props.initialVisibility ?? (defaultStore.state.rememberNoteVisibility ? defaultStore.state.visibility : defaultStore.state.defaultNoteVisibility) as typeof Misskey.noteVisibilities[number]);
 const visibleUsers = ref<Misskey.entities.UserDetailed[]>([]);
 if (props.initialVisibleUsers) {
@@ -333,11 +327,6 @@ if ($i.isSilenced && visibility.value === 'public') {
 	visibility.value = 'home';
 }
 
-if (props.channel) {
-	visibility.value = 'public';
-	localOnly.value = true; // TODO: チャンネルが連合するようになった折には消す
-}
-
 // 公開以外へのリプライ時は元の公開範囲を引き継ぐ
 if (props.reply && ['home', 'followers', 'specified'].includes(props.reply.visibility)) {
 	if (props.reply.visibility === 'home' && visibility.value === 'followers') {
@@ -385,7 +374,6 @@ function watchForDraft() {
 	watch(event, () => saveDraft());
 	watch(files, () => saveDraft(), { deep: true });
 	watch(visibility, () => saveDraft());
-	watch(localOnly, () => saveDraft());
 }
 
 function checkMissingMention() {
@@ -489,16 +477,9 @@ function upload(file: File, name?: string): void {
 }
 
 function setVisibility() {
-	if (props.channel) {
-		visibility.value = 'public';
-		localOnly.value = true; // TODO: チャンネルが連合するようになった折には消す
-		return;
-	}
-
 	os.popup(defineAsyncComponent(() => import('@/components/MkVisibilityPicker.vue')), {
 		currentVisibility: visibility.value,
 		isSilenced: $i.isSilenced,
-		localOnly: localOnly.value,
 		src: visibilityButton.value,
 	}, {
 		changeVisibility: v => {
@@ -510,48 +491,6 @@ function setVisibility() {
 	}, 'closed');
 }
 
-async function toggleLocalOnly() {
-	if (props.channel) {
-		visibility.value = 'public';
-		localOnly.value = true; // TODO: チャンネルが連合するようになった折には消す
-		return;
-	}
-
-	const neverShowInfo = miLocalStorage.getItem('neverShowLocalOnlyInfo');
-
-	if (!localOnly.value && neverShowInfo !== 'true') {
-		const confirm = await os.actions({
-			type: 'question',
-			title: i18n.ts.disableFederationConfirm,
-			text: i18n.ts.disableFederationConfirmWarn,
-			actions: [
-				{
-					value: 'yes' as const,
-					text: i18n.ts.disableFederationOk,
-					primary: true,
-				},
-				{
-					value: 'neverShow' as const,
-					text: `${i18n.ts.disableFederationOk} (${i18n.ts.neverShow})`,
-					danger: true,
-				},
-				{
-					value: 'no' as const,
-					text: i18n.ts.cancel,
-				},
-			],
-		});
-		if (confirm.canceled) return;
-		if (confirm.result === 'no') return;
-
-		if (confirm.result === 'neverShow') {
-			miLocalStorage.setItem('neverShowLocalOnlyInfo', 'true');
-		}
-	}
-
-	localOnly.value = !localOnly.value;
-}
-
 async function toggleReactionAcceptance() {
 	const select = await os.select({
 		title: i18n.ts.reactionAcceptance,
@@ -608,7 +547,6 @@ function onKeydown(ev: KeyboardEvent) {
 		else if (ev.ctrlKey && ev.shiftKey && (visibility.value === 'public')) visibility.value = 'home';
 		else if (ev.ctrlKey && ev.shiftKey && (visibility.value === 'home')) visibility.value = 'followers';
 		else if (ev.ctrlKey && ev.shiftKey && (visibility.value === 'followers')) visibility.value = 'specified';
-		if ((ev.ctrlKey || ev.metaKey) && ev.altKey) localOnly.value = !localOnly.value;
 	}
 
 	if (ev.key === 'Escape') emit('esc');
@@ -740,7 +678,6 @@ function saveDraft() {
 			cw: cw.value,
 			disableRightClick: disableRightClick.value,
 			visibility: visibility.value,
-			localOnly: localOnly.value,
 			files: files.value,
 			poll: poll.value,
 			event: event.value,
@@ -821,7 +758,6 @@ async function post(ev?: MouseEvent) {
 		poll: poll.value,
 		event: event.value,
 		cw: useCw.value ? cw.value ?? '' : null,
-		localOnly: localOnly.value,
 		visibility: visibility.value,
 		visibleUserIds: visibility.value === 'specified' ? visibleUsers.value.map(u => u.id) : undefined,
 		reactionAcceptance: reactionAcceptance.value,
@@ -945,7 +881,7 @@ function cancel() {
 }
 
 function insertMention() {
-	os.selectUser({ localOnly: localOnly.value, includeSelf: true }).then(user => {
+	os.selectUser({ localOnly: false, includeSelf: true }).then(user => {
 		insertTextAtCursor(textareaEl.value, '@' + Misskey.acct.toString(user) + ' ');
 	});
 }
@@ -1089,7 +1025,6 @@ onMounted(() => {
 				cw.value = draft.data.cw;
 				disableRightClick.value = draft.data.disableRightClick;
 				visibility.value = draft.data.visibility;
-				localOnly.value = draft.data.localOnly;
 				files.value = (draft.data.files || []).filter(draftFile => draftFile);
 				if (draft.data.poll) {
 					poll.value = draft.data.poll;
@@ -1129,7 +1064,6 @@ onMounted(() => {
 				};
 			}
 			visibility.value = init.visibility;
-			localOnly.value = init.localOnly ?? false;
 			quoteId.value = init.renote ? init.renote.id : null;
 			disableRightClick.value = init.disableRightClick != null;
 		}
diff --git a/packages/frontend/src/components/MkVisibilityPicker.vue b/packages/frontend/src/components/MkVisibilityPicker.vue
index 8af5d455bc..ac9dcfd1bd 100644
--- a/packages/frontend/src/components/MkVisibilityPicker.vue
+++ b/packages/frontend/src/components/MkVisibilityPicker.vue
@@ -30,7 +30,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<span :class="$style.itemDescription">{{ i18n.ts._visibility.followersDescription }}</span>
 			</div>
 		</button>
-		<button key="specified" :disabled="localOnly" class="_button" :class="[$style.item, { [$style.active]: v === 'specified' }]" data-index="4" @click="choose('specified')">
+		<button key="specified" class="_button" :class="[$style.item, { [$style.active]: v === 'specified' }]" data-index="4" @click="choose('specified')">
 			<div :class="$style.icon"><i class="ti ti-mail"></i></div>
 			<div :class="$style.body">
 				<span :class="$style.itemTitle">{{ i18n.ts._visibility.specified }}</span>
@@ -61,7 +61,6 @@ const modal = shallowRef<InstanceType<typeof MkModal>>();
 const props = withDefaults(defineProps<{
 	currentVisibility: typeof Misskey.noteVisibilities[number];
 	isSilenced: boolean;
-	localOnly: boolean;
 	src?: HTMLElement;
 	isReplyVisibilitySpecified?: boolean;
 }>(), {