diff --git a/src/ai.ts b/src/ai.ts
index 4042ddf..f9e46ad 100644
--- a/src/ai.ts
+++ b/src/ai.ts
@@ -3,10 +3,10 @@
 import * as loki from 'lokijs';
 import * as WebSocket from 'ws';
 import * as request from 'request-promise-native';
-import serifs from './serifs';
 import config from './config';
 import IModule from './module';
 import MessageLike from './message-like';
+import { FriendDoc } from './friend';
 const ReconnectingWebSocket = require('../node_modules/reconnecting-websocket/dist/reconnecting-websocket-cjs.js');
 
 /**
@@ -38,10 +38,7 @@ export default class 藍 {
 		data?: any;
 	}>;
 
-	public friends: loki.Collection<{
-		userId: string;
-		name?: string;
-	}>;
+	public friends: loki.Collection<FriendDoc>;
 
 	constructor(account: any) {
 		this.account = account;
diff --git a/src/friend.ts b/src/friend.ts
new file mode 100644
index 0000000..cc7f1a3
--- /dev/null
+++ b/src/friend.ts
@@ -0,0 +1,110 @@
+import 藍 from './ai';
+import IModule from './module';
+
+export type FriendDoc = {
+	userId: string;
+	user: any;
+	name?: string;
+	love?: number;
+	lastLoveIncrementedAt?: string;
+	todayLoveIncrements?: number;
+	perModulesData?: any;
+};
+
+export default class Friend {
+	private ai: 藍;
+
+	public get userId() {
+		return this.doc.userId;
+	}
+
+	public get name() {
+		return this.doc.name;
+	}
+
+	public get love() {
+		return this.doc.love || 0;
+	}
+
+	public doc: FriendDoc;
+
+	constructor(ai: 藍, opts: { user?: any, doc?: FriendDoc }) {
+		this.ai = ai;
+
+		if (opts.user) {
+			this.doc = this.ai.friends.findOne({
+				userId: opts.user.id
+			});
+
+			if (this.doc == null) {
+				this.doc = this.ai.friends.insertOne({
+					userId: opts.user.id,
+					user: opts.user
+				});
+			} else {
+				this.doc.user = opts.user;
+				this.save();
+			}
+		} else {
+			this.doc = opts.doc;
+		}
+	}
+
+	public updateUser = (user: any) => {
+		this.doc.user = user;
+		this.save();
+	}
+
+	public getPerModulesData = (module: IModule) => {
+		if (this.doc.perModulesData == null) {
+			this.doc.perModulesData = {};
+			this.doc.perModulesData[module.name] = {};
+			this.save();
+		} else if (this.doc.perModulesData[module.name] == null) {
+			this.doc.perModulesData[module.name] = {};
+			this.save();
+		}
+
+		return this.doc.perModulesData[module.name];
+	}
+
+	public setPerModulesData = (module: IModule, data: any) => {
+		if (this.doc.perModulesData == null) {
+			this.doc.perModulesData = {};
+		}
+
+		this.doc.perModulesData[module.name] = data;
+
+		this.save();
+	}
+
+	public incLove = () => {
+		const now = new Date();
+		const y = now.getFullYear();
+		const m = now.getMonth();
+		const d = now.getDate();
+		const today = `${y}/${m + 1}/${d}`;
+
+		if (this.doc.lastLoveIncrementedAt != today) {
+			this.doc.todayLoveIncrements = 0;
+		}
+
+		// 1日に上げられる親愛度は最大3
+		if (this.doc.lastLoveIncrementedAt == today && this.doc.todayLoveIncrements >= 3) return;
+
+		if (this.doc.love == null) this.doc.love = 0;
+		this.doc.love++;
+		this.doc.lastLoveIncrementedAt = today;
+		this.doc.todayLoveIncrements = (this.doc.todayLoveIncrements || 0) + 1;
+		this.save();
+	}
+
+	public updateName = (name: string) => {
+		this.doc.name = name;
+		this.save();
+	}
+
+	public save = () => {
+		this.ai.friends.update(this.doc);
+	}
+}
diff --git a/src/message-like.ts b/src/message-like.ts
index 9a8a7b5..f4e0ce0 100644
--- a/src/message-like.ts
+++ b/src/message-like.ts
@@ -1,4 +1,5 @@
 import 藍 from './ai';
+import Friend from './friend';
 const delay = require('timeout-as-promise');
 
 export default class MessageLike {
@@ -26,22 +27,21 @@ export default class MessageLike {
 		return this.messageOrNote.replyId;
 	}
 
-	public friend: ReturnType<藍['friends']['findOne']>;
+	public friend: Friend;
 
 	constructor(ai: 藍, messageOrNote: any, isMessage: boolean) {
 		this.ai = ai;
 		this.messageOrNote = messageOrNote;
 		this.isMessage = isMessage;
 
-		this.friend = this.ai.friends.findOne({
-			userId: this.userId
-		});
+		this.friend = new Friend(ai, { user: this.user });
 
-		if (this.friend == null) {
-			this.friend = this.ai.friends.insertOne({
-				userId: this.userId
-			});
-		}
+		// メッセージなどに付いているユーザー情報は省略されている場合があるので完全なユーザー情報を持ってくる
+		this.ai.api('users/show', {
+			userId: this.userId
+		}).then(user => {
+			this.friend.updateUser(user);
+		});
 	}
 
 	public reply = async (text: string, cw?: string) => {
diff --git a/src/modules/core/index.ts b/src/modules/core/index.ts
index 9abdf81..322e72f 100644
--- a/src/modules/core/index.ts
+++ b/src/modules/core/index.ts
@@ -3,6 +3,11 @@ import 藍 from '../../ai';
 import IModule from '../../module';
 import MessageLike from '../../message-like';
 import serifs from '../../serifs';
+import Friend from '../../friend';
+
+function zeroPadding(num: number, length: number): string {
+	return ('0000000000' + num).slice(-length);
+}
 
 export default class CoreModule implements IModule {
 	public name = 'core';
@@ -10,46 +15,117 @@ export default class CoreModule implements IModule {
 
 	public install = (ai: 藍) => {
 		this.ai = ai;
+
+		this.crawleBirthday();
+		setInterval(this.crawleBirthday, 1000 * 60 * 3);
 	}
 
 	public onMention = (msg: MessageLike) => {
 		if (!msg.text) return false;
 
-		if (msg.text.includes('って呼んで') && !msg.text.startsWith('って呼んで')) {
-			const name = msg.text.match(/^(.+?)って呼んで/)[1];
+		return this.setName(msg) || this.greet(msg);
+	}
 
-			if (name.length > 10) {
-				msg.reply(serifs.core.tooLong);
-				return true;
-			}
+	/**
+	 * 誕生日のユーザーがいないかチェック(いたら祝う)
+	 */
+	private crawleBirthday = () => {
+		const now = new Date();
+		const y = now.getFullYear();
+		const m = now.getMonth();
+		const d = now.getDate();
+		// Misskeyの誕生日は 2018-06-16 のような形式
+		const today = `${zeroPadding(m + 1, 2)}-${d}`;
 
-			const withSan =
-				name.endsWith('さん') ||
-				name.endsWith('くん') ||
-				name.endsWith('君') ||
-				name.endsWith('ちゃん') ||
-				name.endsWith('様');
+		const birthFriends = this.ai.friends.find({
+			'user.profile.birthday': { '$regex': new RegExp('-' + today + '$') }
+		} as any);
 
-			if (withSan) {
-				msg.friend.name = name;
-				this.ai.friends.update(msg.friend);
-				msg.reply(serifs.core.setNameOk.replace('{name}', name));
-			} else {
-				msg.reply(serifs.core.san).then(reply => {
-					this.ai.subscribeReply(this, msg.userId, msg.isMessage, msg.isMessage ? msg.userId : reply.id, {
-						name: name
-					});
-				});
-			}
+		birthFriends.forEach(f => {
+			const friend = new Friend(this.ai, { doc: f });
 
+			const data = friend.getPerModulesData(this);
+
+			if (data.lastBirthdayChecked == today) return;
+
+			data.lastBirthdayChecked = today;
+			friend.setPerModulesData(this, data);
+
+			const text = friend.name ? serifs.core.happyBirthdayWithName.replace('{name}', friend.name) : serifs.core.happyBirthday;
+
+			this.ai.sendMessage(friend.userId, {
+				text: text
+			});
+		});
+	}
+
+	private setName = (msg: MessageLike): boolean => {
+		if (!msg.text) return false;
+		if (!msg.text.includes('って呼んで')) return false;
+		if (msg.text.startsWith('って呼んで')) return false;
+
+		if (msg.friend.love < 5) {
+			msg.reply(serifs.core.requireMoreLove);
 			return true;
-		} else if (msg.text.includes('おはよう')) {
+		}
+
+		const name = msg.text.match(/^(.+?)って呼んで/)[1];
+
+		if (name.length > 10) {
+			msg.reply(serifs.core.tooLong);
+			return true;
+		}
+
+		const withSan =
+			name.endsWith('さん') ||
+			name.endsWith('くん') ||
+			name.endsWith('君') ||
+			name.endsWith('ちゃん') ||
+			name.endsWith('様');
+
+		if (withSan) {
+			msg.friend.updateName(name);
+			msg.reply(serifs.core.setNameOk.replace('{name}', name));
+		} else {
+			msg.reply(serifs.core.san).then(reply => {
+				this.ai.subscribeReply(this, msg.userId, msg.isMessage, msg.isMessage ? msg.userId : reply.id, {
+					name: name
+				});
+			});
+		}
+
+		return true;
+	}
+
+	private greet = (msg: MessageLike): boolean => {
+		if (!msg.text) return false;
+
+		const incLove = () => {
+			const now = new Date();
+			const y = now.getFullYear();
+			const m = now.getMonth();
+			const d = now.getDate();
+			const date = `${y}/${m + 1}/${d}`;
+
+			const data = msg.friend.getPerModulesData(this);
+
+			if (data.lastGreetedAt == date) return;
+
+			data.lastGreetedAt = date;
+			msg.friend.setPerModulesData(this, data);
+
+			msg.friend.incLove();
+		};
+
+		if (msg.text.includes('おはよう')) {
 			if (msg.friend.name) {
 				msg.reply(serifs.core.goodMorningWithName.replace('{name}', msg.friend.name));
 			} else {
 				msg.reply(serifs.core.goodMorning);
 			}
 
+			incLove();
+
 			return true;
 		} else if (msg.text.includes('おやすみ')) {
 			if (msg.friend.name) {
@@ -58,6 +134,8 @@ export default class CoreModule implements IModule {
 				msg.reply(serifs.core.goodNight);
 			}
 
+			incLove();
+
 			return true;
 		} else {
 			return false;
@@ -68,16 +146,15 @@ export default class CoreModule implements IModule {
 		if (msg.text == null) return;
 
 		const done = () => {
-			this.ai.friends.update(msg.friend);
 			msg.reply(serifs.core.setNameOk.replace('{name}', msg.friend.name));
 			this.ai.unsubscribeReply(this, msg.userId);
 		};
 
 		if (msg.text.includes('はい')) {
-			msg.friend.name = data.name + 'さん';
+			msg.friend.updateName(data.name + 'さん');
 			done();
 		} else if (msg.text.includes('いいえ')) {
-			msg.friend.name = data.name;
+			msg.friend.updateName(data.name);
 			done();
 		} else {
 			msg.reply(serifs.core.yesOrNo).then(reply => {
diff --git a/src/serifs.ts b/src/serifs.ts
index f0b7a0a..e3a8d4d 100644
--- a/src/serifs.ts
+++ b/src/serifs.ts
@@ -7,7 +7,10 @@ export default {
 		goodMorningWithName: 'おはようございます、{name}！',
 		goodNight: 'おやすみなさい！',
 		goodNightWithName: 'おやすみなさい、{name}！',
-		tooLong: '長すぎる気がします...'
+		tooLong: '長すぎる気がします...',
+		requireMoreLove: 'もっと仲良くなったら考えてあげてもいいですよ？',
+		happyBirthday: 'お誕生日おめでとうございます🎉',
+		happyBirthdayWithName: 'お誕生日おめでとうございます、{name}🎉'
 	},
 
 	keyword: {