diff --git a/packages/backend/src/core/GlobalEventService.ts b/packages/backend/src/core/GlobalEventService.ts
index 5271c6f57b..050f0a7e68 100644
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -226,6 +226,12 @@ export interface MahjongRoomEventTypes {
 		callee: Mahjong.Common.House;
 		tile: Mahjong.Common.Tile;
 	};
+	kanned: {
+		caller: Mahjong.Common.House;
+		callee: Mahjong.Common.House;
+		tile: Mahjong.Common.Tile;
+		rinsyan: Mahjong.Common.Tile;
+	};
 	ronned: {
 	};
 	hora: {
diff --git a/packages/backend/src/core/MahjongService.ts b/packages/backend/src/core/MahjongService.ts
index af40fea9b5..1c36aea0c1 100644
--- a/packages/backend/src/core/MahjongService.ts
+++ b/packages/backend/src/core/MahjongService.ts
@@ -315,9 +315,20 @@ export class MahjongService implements OnApplicationShutdown, OnModuleInit {
 			const userId = engine.state.user1House === engine.state.turn ? room.user1Id : engine.state.user2House === engine.state.turn ? room.user2Id : engine.state.user3House === engine.state.turn ? room.user3Id : room.user4Id;
 			this.waitForTurn(room, userId, engine);
 		} else if (res.type === 'kanned') {
-			// TODO
+			this.globalEventService.publishMahjongRoomStream(room.id, 'kanned', { caller: res.caller, callee: res.callee, tile: res.tile, rinsyan: res.rinsyan });
+			const userId = engine.state.user1House === engine.state.turn ? room.user1Id : engine.state.user2House === engine.state.turn ? room.user2Id : engine.state.user3House === engine.state.turn ? room.user3Id : room.user4Id;
+			this.waitForTurn(room, userId, engine);
 		} else if (res.type === 'ronned') {
-			this.globalEventService.publishMahjongRoomStream(room.id, 'ronned', { });
+			this.globalEventService.publishMahjongRoomStream(room.id, 'ronned', {
+				callers: res.callers,
+				callee: res.callee,
+				handTiles: {
+					e: engine.state.handTiles.e,
+					s: engine.state.handTiles.s,
+					w: engine.state.handTiles.w,
+					n: engine.state.handTiles.n,
+				},
+			});
 			this.endKyoku(room, engine);
 		}
 	}
diff --git a/packages/misskey-mahjong/src/common.ts b/packages/misskey-mahjong/src/common.ts
index 349d23f335..31a3594fb0 100644
--- a/packages/misskey-mahjong/src/common.ts
+++ b/packages/misskey-mahjong/src/common.ts
@@ -55,14 +55,13 @@ export type Huro = {
 	type: 'cii';
 	tiles: [Tile, Tile, Tile];
 	from: House;
-} | {
-	type: 'minkan';
-	tile: Tile;
-	from: House;
 } | {
 	type: 'ankan';
 	tile: Tile;
-	from: House;
+} | {
+	type: 'minkan';
+	tile: Tile;
+	from: House | null; // null で加槓
 };
 
 export const yakuNames = [
diff --git a/packages/misskey-mahjong/src/engine.master.ts b/packages/misskey-mahjong/src/engine.master.ts
index 6da22b23ec..7ca7f78828 100644
--- a/packages/misskey-mahjong/src/engine.master.ts
+++ b/packages/misskey-mahjong/src/engine.master.ts
@@ -233,8 +233,6 @@ export class MasterGameEngine {
 		}
 
 		this.endKyoku();
-
-		// TODO: 役情報を返す
 	}
 
 	public commit_dahai(house: House, tile: Tile, riichi = false) {
@@ -381,12 +379,18 @@ export class MasterGameEngine {
 		};
 
 		if (this.state.ronAsking != null && answers.ron.length > 0) {
+			const callers = this.state.ronAsking.callers;
+			const callee = this.state.ronAsking.callee;
+
 			this.ron(answers.ron, this.state.ronAsking.callee);
 			return {
 				type: 'ronned',
+				callers,
+				callee,
 			};
 		}
 
+		// 大明槓
 		if (this.state.kanAsking != null && answers.kan) {
 			const caller = this.state.kanAsking.caller;
 			const callee = this.state.kanAsking.callee;
@@ -394,10 +398,17 @@ export class MasterGameEngine {
 			const tile = this.state.hoTiles[callee].pop()!;
 			this.state.huros[caller].push({ type: 'minkan', tile, from: callee });
 
+			const rinsyan = this.tsumo();
+
 			clearAsking();
 			this.state.turn = caller;
-			// TODO
-			return;
+			return {
+				type: 'kanned',
+				caller,
+				callee,
+				tile,
+				rinsyan,
+			};
 		}
 
 		if (this.state.ponAsking != null && answers.pon) {