diff --git a/src/message.ts b/src/message.ts
index c674e42..4b55816 100644
--- a/src/message.ts
+++ b/src/message.ts
@@ -28,6 +28,12 @@ export default class Message {
 		return this.messageOrNote.text;
 	}
 
+	public get extractedText(): string {
+		return this.text
+			.replace(new RegExp(`^@${this.ai.account.username}(@.+?)?\s?`, 'i'), '')
+			.trim();
+	}
+
 	public get replyId(): string {
 		return this.messageOrNote.replyId;
 	}
diff --git a/src/modules/guessing-game/index.ts b/src/modules/guessing-game/index.ts
index bc9e089..805290e 100644
--- a/src/modules/guessing-game/index.ts
+++ b/src/modules/guessing-game/index.ts
@@ -86,7 +86,7 @@ export default class extends Module {
 			return;
 		}
 
-		const guess = msg.text.toLowerCase().replace(this.ai.account.username.toLowerCase(), '').match(/[0-9]+/);
+		const guess = msg.extractedText.match(/[0-9]+/);
 
 		if (guess == null) {
 			msg.reply(serifs.guessingGame.nan).then(reply => {
diff --git a/src/modules/kazutori/index.ts b/src/modules/kazutori/index.ts
index 83d2810..ef528b2 100644
--- a/src/modules/kazutori/index.ts
+++ b/src/modules/kazutori/index.ts
@@ -85,7 +85,7 @@ export default class extends Module {
 		// 既に数字を取っていたら
 		if (game.votes.some(x => x.user.id == msg.userId)) return;
 
-		const match = msg.text.match(/[0-9]+/);
+		const match = msg.extractedText.match(/[0-9]+/);
 		if (match == null) return;
 
 		const num = parseInt(match[0], 10);