diff --git a/src/message-like.ts b/src/message-like.ts
index b720029..f897cd7 100644
--- a/src/message-like.ts
+++ b/src/message-like.ts
@@ -2,6 +2,7 @@ import 藍 from './ai';
 import Friend from './friend';
 import { User } from './misskey/user';
 import includes from './utils/includes';
+import includes from './utils/or';
 const delay = require('timeout-as-promise');
 
 export default class MessageLike {
@@ -47,6 +48,8 @@ export default class MessageLike {
 	}
 
 	public reply = async (text: string, cw?: string) => {
+		if (text == null) return;
+
 		console.log(`sending reply of ${this.id} ...`);
 
 		await delay(2000);
@@ -67,4 +70,8 @@ export default class MessageLike {
 	public includes = (words: string[]): boolean => {
 		return includes(this.text, words);
 	}
+
+	public or = (words: string[]): boolean => {
+		return or(this.text, words);
+	}
 }
diff --git a/src/modules/core/index.ts b/src/modules/core/index.ts
index 14a7a26..1cdc46a 100644
--- a/src/modules/core/index.ts
+++ b/src/modules/core/index.ts
@@ -32,6 +32,7 @@ export default class CoreModule implements IModule {
 			this.greet(msg) ||
 			this.nadenade(msg) ||
 			this.kawaii(msg) ||
+			this.suki(msg) ||
 			this.humu(msg) ||
 			this.batou(msg) ||
 			this.ponkotu(msg)
@@ -208,6 +209,20 @@ export default class CoreModule implements IModule {
 		return true;
 	}
 
+	private suki = (msg: MessageLike): boolean => {
+		if (!msg.or(['好き', 'すき'])) return false;
+
+		// メッセージのみ
+		if (!msg.isMessage) return true;
+
+		msg.reply(
+			msg.friend.love >= 5 ? serifs.core.suki.love :
+			msg.friend.love <= -3 ? serifs.core.suki.hate :
+			serifs.core.suki.normal);
+
+		return true;
+	}
+
 	private humu = (msg: MessageLike): boolean => {
 		if (!msg.includes(['踏んで'])) return false;
 
diff --git a/src/serifs.ts b/src/serifs.ts
index 00d0b0b..f7f7ae4 100644
--- a/src/serifs.ts
+++ b/src/serifs.ts
@@ -46,6 +46,14 @@ export default {
 			hate: '…ありがとうございます'
 		},
 
+		suki: {
+			normal: 'えっ… ありがとうございます…♪',
+
+			love: name => `私も${name}のこと好きですよ♪`,
+
+			hate: null
+		},
+
 		humu: {
 			normal: 'え、えっと…… ふみふみ……… どうですか…？',
 
diff --git a/src/utils/or.ts b/src/utils/or.ts
new file mode 100644
index 0000000..0a871b0
--- /dev/null
+++ b/src/utils/or.ts
@@ -0,0 +1,17 @@
+import { hiraganaToKatagana, hankakuToZenkaku } from './japanese';
+
+export default function(text: string, words: string[]): boolean {
+	if (text == null) return false;
+
+	text = cleanup(hankakuToZenkaku(hiraganaToKatagana(text)));
+	words = words.map(word => hiraganaToKatagana(word));
+
+	return words.some(word => text == word);
+}
+
+function cleanup(text: string): string {
+	return text.trim()
+		.replace(/[！!]+$/, '')
+		.replace(/。$/, '')
+		.replace(/(です|デス)$/, '');
+}
diff --git a/torisetu.md b/torisetu.md
index 15da087..b15524c 100644
--- a/torisetu.md
+++ b/torisetu.md
@@ -51,6 +51,7 @@ PONGを返します。生存確認にどうぞ
 
 ### その他反応するフレーズ
 * かわいい
+* 好き (メッセージのみ)
 * 罵って (メッセージのみ)
 * 踏んで (メッセージのみ)