diff --git a/src/ai.ts b/src/ai.ts
index b46db52..42e85b6 100644
--- a/src/ai.ts
+++ b/src/ai.ts
@@ -11,7 +11,6 @@ import Module from './module';
 import Message from './message';
 import { FriendDoc } from './friend';
 import { User } from './misskey/user';
-import getCollection from './utils/get-collection';
 import Stream from './stream';
 import log from './utils/log';
 
@@ -83,11 +82,11 @@ export default class 藍 {
 	@autobind
 	private run() {
 		//#region Init DB
-		this.contexts = getCollection(this.db, 'contexts', {
+		this.contexts = this.getCollection('contexts', {
 			indices: ['key']
 		});
 
-		this.friends = getCollection(this.db, 'friends', {
+		this.friends = this.getCollection('friends', {
 			indices: ['userId']
 		});
 		//#endregion
@@ -207,6 +206,22 @@ export default class 藍 {
 		}
 	}
 
+	/**
+	 * データベースのコレクションを取得します
+	 */
+	@autobind
+	public getCollection(name: string, opts?: any): loki.Collection {
+		let collection: loki.Collection;
+
+		collection = this.db.getCollection(name);
+
+		if (collection == null) {
+			collection = this.db.addCollection(name, opts);
+		}
+
+		return collection;
+	}
+
 	/**
 	 * 投稿します
 	 */
diff --git a/src/modules/guessing-game/index.ts b/src/modules/guessing-game/index.ts
index 805290e..e6d386a 100644
--- a/src/modules/guessing-game/index.ts
+++ b/src/modules/guessing-game/index.ts
@@ -3,7 +3,6 @@ import * as loki from 'lokijs';
 import Module from '../../module';
 import Message from '../../message';
 import serifs from '../../serifs';
-import getCollection from '../../utils/get-collection';
 
 export default class extends Module {
 	public readonly name = 'guessingGame';
@@ -19,11 +18,9 @@ export default class extends Module {
 
 	@autobind
 	public install() {
-		//#region Init DB
-		this.guesses = getCollection(this.ai.db, 'guessingGame', {
+		this.guesses = this.ai.getCollection('guessingGame', {
 			indices: ['userId']
 		});
-		//#endregion
 
 		return {
 			mentionHook: this.mentionHook,
diff --git a/src/modules/kazutori/index.ts b/src/modules/kazutori/index.ts
index cb3a7ac..0802f01 100644
--- a/src/modules/kazutori/index.ts
+++ b/src/modules/kazutori/index.ts
@@ -3,7 +3,6 @@ import * as loki from 'lokijs';
 import Module from '../../module';
 import Message from '../../message';
 import serifs from '../../serifs';
-import getCollection from '../../utils/get-collection';
 import { User } from '../../misskey/user';
 
 type Game = {
@@ -23,7 +22,7 @@ export default class extends Module {
 
 	@autobind
 	public install() {
-		this.games = getCollection(this.ai.db, 'kazutori');
+		this.games = this.ai.getCollection('kazutori');
 
 		this.crawleGameEnd();
 		setInterval(this.crawleGameEnd, 1000);
diff --git a/src/modules/keyword/index.ts b/src/modules/keyword/index.ts
index 7f8bd40..ae44b99 100644
--- a/src/modules/keyword/index.ts
+++ b/src/modules/keyword/index.ts
@@ -3,7 +3,6 @@ import * as loki from 'lokijs';
 import Module from '../../module';
 import config from '../../config';
 import serifs from '../../serifs';
-import getCollection from '../../utils/get-collection';
 const MeCab = require('mecab-async');
 
 function kanaToHira(str: string) {
@@ -26,11 +25,9 @@ export default class extends Module {
 	public install() {
 		if (!config.keywordEnabled) return {};
 
-		//#region Init DB
-		this.learnedKeywords = getCollection(this.ai.db, '_keyword_learnedKeywords', {
+		this.learnedKeywords = this.ai.getCollection('_keyword_learnedKeywords', {
 			indices: ['userId']
 		});
-		//#endregion
 
 		this.tokenizer = new MeCab();
 		this.tokenizer.command = config.mecab;
diff --git a/src/utils/get-collection.ts b/src/utils/get-collection.ts
deleted file mode 100644
index 90ce705..0000000
--- a/src/utils/get-collection.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import * as loki from 'lokijs';
-
-export default function(db: loki, name: string, opts?: any): loki.Collection {
-	let collection;
-
-	collection = db.getCollection(name);
-
-	if (collection == null) {
-		collection = db.addCollection(name, opts);
-	}
-
-	return collection;
-}