diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index 607ab293b3..928144a12b 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -496,6 +496,7 @@ export class ApRendererService {
 			preferredUsername: user.username,
 			name: user.name,
 			summary: profile.description ? this.mfmService.toHtml(mfm.parse(profile.description)) : null,
+			_misskey_summary: profile.description,
 			icon: avatar ? this.renderImage(avatar) : null,
 			image: banner ? this.renderImage(banner) : null,
 			tag,
@@ -645,6 +646,7 @@ export class ApRendererService {
 					'_misskey_quote': 'misskey:_misskey_quote',
 					'_misskey_reaction': 'misskey:_misskey_reaction',
 					'_misskey_votes': 'misskey:_misskey_votes',
+					'_misskey_summary': 'misskey:_misskey_summary',
 					'isCat': 'misskey:isCat',
 					// vcard
 					vcard: 'http://www.w3.org/2006/vcard/ns#',
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index e133ce5d70..bc8c0a85ba 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -335,9 +335,17 @@ export class ApPersonService implements OnModuleInit {
 					emojis,
 				})) as MiRemoteUser;
 
+				let _description: string | null = null;
+
+				if (person._misskey_summary) {
+					_description = truncate(person._misskey_summary, summaryLength);
+				} else if (person.summary) {
+					_description = this.apMfmService.htmlToMfm(truncate(person.summary, summaryLength), person.tag);
+				}
+
 				await transactionalEntityManager.save(new MiUserProfile({
 					userId: user.id,
-					description: person.summary ? this.apMfmService.htmlToMfm(truncate(person.summary, summaryLength), person.tag) : null,
+					description: _description,
 					url,
 					fields,
 					birthday: bday?.[0] ?? null,
@@ -503,10 +511,18 @@ export class ApPersonService implements OnModuleInit {
 			});
 		}
 
+		let _description: string | null = null;
+
+		if (person._misskey_summary) {
+			_description = truncate(person._misskey_summary, summaryLength);
+		} else if (person.summary) {
+			_description = this.apMfmService.htmlToMfm(truncate(person.summary, summaryLength), person.tag);
+		}
+
 		await this.userProfilesRepository.update({ userId: exist.id }, {
 			url,
 			fields,
-			description: person.summary ? this.apMfmService.htmlToMfm(truncate(person.summary, summaryLength), person.tag) : null,
+			description: _description,
 			birthday: bday?.[0] ?? null,
 			location: person['vcard:Address'] ?? null,
 		});
diff --git a/packages/backend/src/core/activitypub/type.ts b/packages/backend/src/core/activitypub/type.ts
index 16ff86e894..d9fcc99066 100644
--- a/packages/backend/src/core/activitypub/type.ts
+++ b/packages/backend/src/core/activitypub/type.ts
@@ -12,6 +12,7 @@ export interface IObject {
 	id?: string;
 	name?: string | null;
 	summary?: string;
+	_misskey_summary?: string;
 	published?: string;
 	cc?: ApObject;
 	to?: ApObject;