diff --git a/packages/frontend-embed/src/components/EmNote.vue b/packages/frontend-embed/src/components/EmNote.vue
index 025c4c0734..a918ae8db4 100644
--- a/packages/frontend-embed/src/components/EmNote.vue
+++ b/packages/frontend-embed/src/components/EmNote.vue
@@ -46,11 +46,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<EmNoteHeader :note="appearNote" :mini="true"/>
 			<EmInstanceTicker v-if="appearNote.user.instance != null" :instance="appearNote.user.instance"/>
 			<div style="container-type: inline-size;">
-				<p v-if="appearNote.cw != null" :class="$style.cw">
-					<EmMfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
 					<button style="display: block; width: 100%; margin: 4px 0;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 				</p>
-				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
+				<div v-show="mergedCW == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
 					<div :class="$style.text">
 						<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 						<EmA v-if="appearNote.replyId" :class="$style.replyIcon" :to="`/notes/${appearNote.replyId}`"><i class="ti ti-arrow-back-up"></i></EmA>
@@ -109,6 +109,7 @@ import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
 import { shouldCollapsed } from '@@/js/collapsed.js';
 import { url } from '@@/js/config.js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import I18n from '@/components/I18n.vue';
 import EmNoteSub from '@/components/EmNoteSub.vue';
 import EmNoteHeader from '@/components/EmNoteHeader.vue';
@@ -154,6 +155,14 @@ const parsed = computed(() => appearNote.value.text ? mfm.parse(appearNote.value
 const isLong = shouldCollapsed(appearNote.value, []);
 const collapsed = ref(appearNote.value.cw == null && isLong);
 const isDeleted = ref(false);
+
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend-embed/src/components/EmNoteDetailed.vue b/packages/frontend-embed/src/components/EmNoteDetailed.vue
index c4ea9b4f2e..10a58feaef 100644
--- a/packages/frontend-embed/src/components/EmNoteDetailed.vue
+++ b/packages/frontend-embed/src/components/EmNoteDetailed.vue
@@ -58,11 +58,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 		</header>
 		<div :class="[$style.noteContent, { [$style.contentCollapsed]: collapsed }]">
-			<p v-if="appearNote.cw != null" :class="$style.cw">
-				<EmMfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="appearNote.user" :nyaize="'respect'" :isBlock="true"/>
 				<button style="display: block; width: 100%; margin: 4px 0;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 			</p>
-			<div v-show="appearNote.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 				<EmA v-if="appearNote.replyId" :class="$style.noteReplyTarget" :to="`/notes/${appearNote.replyId}`"><i class="ti ti-arrow-back-up"></i></EmA>
 				<EmMfm
@@ -130,6 +130,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { computed, inject, ref } from 'vue';
 import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import I18n from '@/components/I18n.vue';
 import EmMediaList from '@/components/EmMediaList.vue';
 import EmNoteSub from '@/components/EmNoteSub.vue';
@@ -175,6 +176,14 @@ const isDeleted = ref(false);
 const parsed = appearNote.value.text ? mfm.parse(appearNote.value.text) : null;
 const isLong = shouldCollapsed(appearNote.value, []);
 const collapsed = ref(appearNote.value.cw == null && isLong);
+
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend-embed/src/components/EmNoteSimple.vue b/packages/frontend-embed/src/components/EmNoteSimple.vue
index 83e73f9870..74aed4e28b 100644
--- a/packages/frontend-embed/src/components/EmNoteSimple.vue
+++ b/packages/frontend-embed/src/components/EmNoteSimple.vue
@@ -9,11 +9,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<div :class="$style.main">
 		<EmNoteHeader :class="$style.header" :note="note" :mini="true"/>
 		<div>
-			<p v-if="note.cw != null" :class="$style.cw">
-				<EmMfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis" :isBlock="true"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis" :isBlock="true"/>
 				<button style="display: block; width: 100%;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 			</p>
-			<div v-show="note.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<EmSubNoteContent :class="$style.text" :note="note"/>
 			</div>
 		</div>
@@ -22,8 +22,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref } from 'vue';
+import { computed, ref } from 'vue';
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import { i18n } from '@/i18n.js';
 import EmAvatar from '@/components/EmAvatar.vue';
 import EmNoteHeader from '@/components/EmNoteHeader.vue';
@@ -35,6 +36,14 @@ const props = defineProps<{
 }>();
 
 const showContent = ref(false);
+
+const mergedCW = computed(() => {
+	let cw = props.note.cw;
+	if (props.note.user.mandatoryCW) {
+		cw = appendContentWarning(cw, props.note.user.mandatoryCW);
+	}
+	return cw;
+});
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend-embed/src/components/EmNoteSub.vue b/packages/frontend-embed/src/components/EmNoteSub.vue
index cc379e8281..e1302bbe25 100644
--- a/packages/frontend-embed/src/components/EmNoteSub.vue
+++ b/packages/frontend-embed/src/components/EmNoteSub.vue
@@ -11,11 +11,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.body">
 			<EmNoteHeader :class="$style.header" :note="note" :mini="true"/>
 			<div>
-				<p v-if="note.cw != null" :class="$style.cw">
-					<EmMfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :author="note.user" :nyaize="'respect'" :isBlock="true"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<EmMfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :author="note.user" :nyaize="'respect'" :isBlock="true"/>
 					<button style="display: block; width: 100%;" class="_buttonGray _buttonRounded" @click="showContent = !showContent">{{ showContent ? i18n.ts._cw.hide : i18n.ts._cw.show }}</button>
 				</p>
-				<div v-show="note.cw == null || showContent">
+				<div v-show="mergedCW == null || showContent">
 					<EmSubNoteContent :class="$style.text" :note="note"/>
 				</div>
 			</div>
@@ -31,8 +31,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref } from 'vue';
+import { computed, ref } from 'vue';
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import EmA from '@/components/EmA.vue';
 import EmAvatar from '@/components/EmAvatar.vue';
 import EmNoteHeader from '@/components/EmNoteHeader.vue';
@@ -55,6 +56,14 @@ const props = withDefaults(defineProps<{
 const showContent = ref(false);
 const replies = ref<Misskey.entities.Note[]>([]);
 
+const mergedCW = computed(() => {
+	let cw = props.note.cw;
+	if (props.note.user.mandatoryCW) {
+		cw = appendContentWarning(cw, props.note.user.mandatoryCW);
+	}
+	return cw;
+});
+
 if (props.detail) {
 	misskeyApi('notes/children', {
 		noteId: props.note.id,
diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index 9271e9e4b7..aa971b0ab3 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -59,10 +59,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<MkInstanceTicker v-if="showTicker" :host="appearNote.user.host" :instance="appearNote.user.instance"/>
 			<div style="container-type: inline-size;">
 				<bdi>
-				<p v-if="appearNote.cw != null" :class="$style.cw">
+				<p v-if="mergedCW != null" :class="$style.cw">
 					<Mfm
-						v-if="appearNote.cw != ''"
-						:text="appearNote.cw"
+						v-if="mergedCW != ''"
+						:text="mergedCW"
 						:author="appearNote.user"
 						:nyaize="'respect'"
 						:enableEmojiMenu="true"
@@ -71,7 +71,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					/>
 					<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll" style="margin: 4px 0;" @click.stop/>
 				</p>
-				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
+				<div v-show="mergedCW == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
 					<div :class="$style.text">
 						<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 						<MkA v-if="appearNote.replyId" :class="$style.replyIcon" :to="`/notes/${appearNote.replyId}`"><i class="ph-arrow-bend-left-up ph-bold ph-lg"></i></MkA>
@@ -212,6 +212,7 @@ import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { shouldCollapsed } from '@@/js/collapsed.js';
 import { host } from '@@/js/config.js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import type { MenuItem } from '@/types/menu.js';
 import MkNoteSub from '@/components/MkNoteSub.vue';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
@@ -350,6 +351,14 @@ const pleaseLoginContext = computed<OpenOnRemoteOptions>(() => ({
 	url: `https://${host}/notes/${appearNote.value.id}`,
 }));
 
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 /* Overload FunctionにLintが対応していないのでコメントアウト
diff --git a/packages/frontend/src/components/MkNoteDetailed.vue b/packages/frontend/src/components/MkNoteDetailed.vue
index 6c52714f46..5f7c4fa12f 100644
--- a/packages/frontend/src/components/MkNoteDetailed.vue
+++ b/packages/frontend/src/components/MkNoteDetailed.vue
@@ -75,10 +75,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 		</header>
 		<div :class="$style.noteContent">
-			<p v-if="appearNote.cw != null" :class="$style.cw">
+			<p v-if="mergedCW != null" :class="$style.cw">
 				<Mfm
-					v-if="appearNote.cw != ''"
-					:text="appearNote.cw"
+					v-if="mergedCW != ''"
+					:text="mergedCW"
 					:author="appearNote.user"
 					:nyaize="'respect'"
 					:enableEmojiMenu="true"
@@ -87,7 +87,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				/>
 				<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll"/>
 			</p>
-			<div v-show="appearNote.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 				<MkA v-if="appearNote.replyId" :class="$style.noteReplyTarget" :to="`/notes/${appearNote.replyId}`"><i class="ph-arrow-bend-left-up ph-bold ph-lg"></i></MkA>
 				<Mfm
@@ -245,6 +245,7 @@ import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { host } from '@@/js/config.js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import MkNoteSub from '@/components/MkNoteSub.vue';
 import MkNoteSimple from '@/components/MkNoteSimple.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
@@ -348,6 +349,14 @@ const quotes = ref<Misskey.entities.Note[]>([]);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 watch(() => props.expandAllCws, (expandAllCws) => {
diff --git a/packages/frontend/src/components/MkNoteSimple.vue b/packages/frontend/src/components/MkNoteSimple.vue
index 9ef45a0ec3..e487fb978e 100644
--- a/packages/frontend/src/components/MkNoteSimple.vue
+++ b/packages/frontend/src/components/MkNoteSimple.vue
@@ -9,11 +9,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<div :class="$style.main">
 		<MkNoteHeader :class="$style.header" :note="note" :mini="true"/>
 		<div>
-			<p v-if="note.cw != null" :class="$style.cw">
-				<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
 				<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll" @click.stop/>
 			</p>
-			<div v-show="note.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<MkSubNoteContent :hideFiles="hideFiles" :class="$style.text" :note="note" :expandAllCws="props.expandAllCws"/>
 				<div v-if="note.isSchedule" style="margin-top: 10px;">
 					<MkButton :class="$style.button" inline @click.stop.prevent="editScheduleNote()"><i class="ti ti-eraser"></i> {{ i18n.ts.edit }}</MkButton>
@@ -26,8 +26,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref, watch } from 'vue';
+import { computed, ref, watch } from 'vue';
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import * as os from '@/os.js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
@@ -48,6 +49,14 @@ const props = defineProps<{
 let showContent = ref(defaultStore.state.uncollapseCW);
 const isDeleted = ref(false);
 
+const mergedCW = computed(() => {
+	let cw = props.note.cw;
+	if (props.note.user.mandatoryCW) {
+		cw = appendContentWarning(cw, props.note.user.mandatoryCW);
+	}
+	return cw;
+});
+
 const emit = defineEmits<{
 	(ev: 'editScheduleNote'): void;
 }>();
diff --git a/packages/frontend/src/components/MkNoteSub.vue b/packages/frontend/src/components/MkNoteSub.vue
index 9febc1219c..43cc35d3cc 100644
--- a/packages/frontend/src/components/MkNoteSub.vue
+++ b/packages/frontend/src/components/MkNoteSub.vue
@@ -11,11 +11,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.body">
 			<MkNoteHeader :class="$style.header" :note="note" :mini="true"/>
 			<div :class="$style.content">
-				<p v-if="note.cw != null" :class="$style.cw">
-					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll"/>
 				</p>
-				<div v-show="note.cw == null || showContent">
+				<div v-show="mergedCW == null || showContent">
 					<MkSubNoteContent :class="$style.text" :note="note" :translating="translating" :translation="translation" :expandAllCws="props.expandAllCws"/>
 				</div>
 			</div>
@@ -86,6 +86,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed, ref, shallowRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
@@ -142,6 +143,14 @@ let appearNote = computed(() => isRenote ? props.note.renote as Misskey.entities
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 const replies = ref<Misskey.entities.Note[]>([]);
 
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
+
 const isRenote = (
 	props.note.renote != null &&
 	props.note.text == null &&
diff --git a/packages/frontend/src/components/SkNote.vue b/packages/frontend/src/components/SkNote.vue
index 323ca283bf..2cfc5ac01e 100644
--- a/packages/frontend/src/components/SkNote.vue
+++ b/packages/frontend/src/components/SkNote.vue
@@ -62,10 +62,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 		<div :class="[{ [$style.clickToOpen]: defaultStore.state.clickToOpen }]" @click.stop="defaultStore.state.clickToOpen ? noteclick(appearNote.id) : undefined">
 			<div style="container-type: inline-size;">
-				<p v-if="appearNote.cw != null" :class="$style.cw">
+				<p v-if="mergedCW != null" :class="$style.cw">
 					<Mfm
-						v-if="appearNote.cw != ''"
-						:text="appearNote.cw"
+						v-if="mergedCW != ''"
+						:text="mergedCW"
 						:author="appearNote.user"
 						:nyaize="'respect'"
 						:enableEmojiMenu="true"
@@ -74,7 +74,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					/>
 					<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll" style="margin: 4px 0;" @click.stop/>
 				</p>
-				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
+				<div v-show="mergedCW == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
 					<div :class="$style.text">
 						<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 						<Mfm
@@ -213,6 +213,7 @@ import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { shouldCollapsed } from '@@/js/collapsed.js';
 import { host } from '@@/js/config.js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import type { MenuItem } from '@/types/menu.js';
 import SkNoteSub from '@/components/SkNoteSub.vue';
 import SkNoteHeader from '@/components/SkNoteHeader.vue';
@@ -345,6 +346,14 @@ const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.
 const animated = computed(() => parsed.value ? checkAnimationFromMfm(parsed.value) : null);
 const allowAnim = ref(defaultStore.state.advancedMfm && defaultStore.state.animatedMfm ? true : false);
 
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 const pleaseLoginContext = computed<OpenOnRemoteOptions>(() => ({
diff --git a/packages/frontend/src/components/SkNoteDetailed.vue b/packages/frontend/src/components/SkNoteDetailed.vue
index dc8a5f59b2..1931946bcc 100644
--- a/packages/frontend/src/components/SkNoteDetailed.vue
+++ b/packages/frontend/src/components/SkNoteDetailed.vue
@@ -81,10 +81,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 		</header>
 		<div :class="$style.noteContent">
-			<p v-if="appearNote.cw != null" :class="$style.cw">
+			<p v-if="mergedCW != null" :class="$style.cw">
 				<Mfm
-					v-if="appearNote.cw != ''"
-					:text="appearNote.cw"
+					v-if="mergedCW != ''"
+					:text="mergedCW"
 					:author="appearNote.user"
 					:nyaize="'respect'"
 					:enableEmojiMenu="true"
@@ -93,7 +93,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				/>
 				<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll"/>
 			</p>
-			<div v-show="appearNote.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<span v-if="appearNote.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 				<Mfm
 					v-if="appearNote.text"
@@ -250,6 +250,7 @@ import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
 import { isLink } from '@@/js/is-link.js';
 import { host } from '@@/js/config.js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import SkNoteSub from '@/components/SkNoteSub.vue';
 import SkNoteSimple from '@/components/SkNoteSimple.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
@@ -354,6 +355,14 @@ const quotes = ref<Misskey.entities.Note[]>([]);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
+
 const renoteTooltip = computeRenoteTooltip(renoted);
 
 watch(() => props.expandAllCws, (expandAllCws) => {
diff --git a/packages/frontend/src/components/SkNoteSimple.vue b/packages/frontend/src/components/SkNoteSimple.vue
index b9895305f2..f30fb82926 100644
--- a/packages/frontend/src/components/SkNoteSimple.vue
+++ b/packages/frontend/src/components/SkNoteSimple.vue
@@ -9,11 +9,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<div :class="$style.main">
 		<MkNoteHeader :class="$style.header" :classic="true" :note="note" :mini="true"/>
 		<div>
-			<p v-if="note.cw != null" :class="$style.cw">
-				<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
+			<p v-if="mergedCW != null" :class="$style.cw">
+				<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
 				<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll" @click.stop/>
 			</p>
-			<div v-show="note.cw == null || showContent">
+			<div v-show="mergedCW == null || showContent">
 				<MkSubNoteContent :hideFiles="hideFiles" :class="$style.text" :note="note" :expandAllCws="props.expandAllCws"/>
 			</div>
 		</div>
@@ -22,8 +22,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { watch, ref } from 'vue';
+import { watch, ref, computed } from 'vue';
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
 import MkCwButton from '@/components/MkCwButton.vue';
@@ -37,6 +38,14 @@ const props = defineProps<{
 
 let showContent = ref(defaultStore.state.uncollapseCW);
 
+const mergedCW = computed(() => {
+	let cw = props.note.cw;
+	if (props.note.user.mandatoryCW) {
+		cw = appendContentWarning(cw, props.note.user.mandatoryCW);
+	}
+	return cw;
+});
+
 watch(() => props.expandAllCws, (expandAllCws) => {
 	if (expandAllCws !== showContent.value) showContent.value = expandAllCws;
 });
diff --git a/packages/frontend/src/components/SkNoteSub.vue b/packages/frontend/src/components/SkNoteSub.vue
index a3d27c9e16..a4ab7b7405 100644
--- a/packages/frontend/src/components/SkNoteSub.vue
+++ b/packages/frontend/src/components/SkNoteSub.vue
@@ -19,11 +19,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.body">
 			<SkNoteHeader :class="$style.header" :note="note" :classic="true" :mini="true"/>
 			<div :class="$style.content">
-				<p v-if="note.cw != null" :class="$style.cw">
-					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
+				<p v-if="mergedCW != null" :class="$style.cw">
+					<Mfm v-if="mergedCW != ''" style="margin-right: 8px;" :text="mergedCW" :isBlock="true" :author="note.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll"/>
 				</p>
-				<div v-show="note.cw == null || showContent">
+				<div v-show="mergedCW == null || showContent">
 					<MkSubNoteContent :class="$style.text" :note="note" :translating="translating" :translation="translation" :expandAllCws="props.expandAllCws"/>
 				</div>
 			</div>
@@ -94,6 +94,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed, ref, shallowRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
+import { appendContentWarning } from '@@/js/append-content-warning.js';
 import SkNoteHeader from '@/components/SkNoteHeader.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
@@ -156,6 +157,14 @@ let appearNote = computed(() => isRenote ? props.note.renote as Misskey.entities
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 const replies = ref<Misskey.entities.Note[]>([]);
 
+const mergedCW = computed(() => {
+	let cw = appearNote.value.cw;
+	if (appearNote.value.user.mandatoryCW) {
+		cw = appendContentWarning(cw, appearNote.value.user.mandatoryCW);
+	}
+	return cw;
+});
+
 const isRenote = (
 	props.note.renote != null &&
 	props.note.text == null &&