diff --git a/packages/backend/src/modules/repositories/Config.ts b/packages/backend/src/modules/repositories/Config.ts
index a4a56cd..39d8bda 100644
--- a/packages/backend/src/modules/repositories/Config.ts
+++ b/packages/backend/src/modules/repositories/Config.ts
@@ -3,12 +3,10 @@ import type { ConfigEntity } from "@/modules/entities/Config";
 
 export class ConfigRepository extends EntityRepository<ConfigEntity> {
   async set(name: string, value: string) {
-    await this.upsert({
+    return await this.upsert({
       name,
       value,
     });
-
-    return;
   }
 
   async get(name: string, defaultValue?: string) {
diff --git a/packages/backend/src/routes/setup/create-admin.ts b/packages/backend/src/routes/setup/create-admin.ts
index 64b65e5..ffbe2eb 100755
--- a/packages/backend/src/routes/setup/create-admin.ts
+++ b/packages/backend/src/routes/setup/create-admin.ts
@@ -3,7 +3,6 @@ import logger from "@/lib/logger";
 import type { FastifyInstance } from "fastify";
 import { UserRepository } from "@/modules/repositories/User";
 import { DatabaseError, ErrorBase, InputError } from "@/errors";
-import { ConfigEntity } from "@/modules/entities/Config";
 
 export default function CreateAdmin(fastify: FastifyInstance) {
   fastify.post("/", async (req, res) => {
@@ -15,22 +14,6 @@ export default function CreateAdmin(fastify: FastifyInstance) {
       return res.code(400).send(InputError(result.error.issues));
     }
 
-    try {
-      const configCount = await fastify.orm.em.count(ConfigEntity);
-
-      if (configCount === 0) {
-        return res.code(409).send(ErrorBase({
-          bad: "client",
-          code: "yet_initialization",
-          message: "初期設定が行われていません。",
-        }));
-      }
-    } catch (err) {
-      logger.error("Database Error: Could not check if already initialization:", err);
-
-      return res.code(500).send(DatabaseError());
-    }
-
     try {
       const userCount = await fastify.orm.em.getRepository(UserEntity).count();
 
diff --git a/packages/backend/src/routes/setup/initialization.ts b/packages/backend/src/routes/setup/initialization.ts
index 3dd7496..a3d2435 100644
--- a/packages/backend/src/routes/setup/initialization.ts
+++ b/packages/backend/src/routes/setup/initialization.ts
@@ -46,12 +46,12 @@ export default function Initialization(fastify: FastifyInstance) {
       const entries = Object.entries(result.data).filter(([key]) => key !== "force");
       
       for (const [key, value] of entries) {
-        const entity = fastify.orm.em.create(ConfigEntity, {
-          name: key,
-          value: typeof value === "string"
+        const entity = fastify.orm.em.getRepository(ConfigEntity).set(
+          key,
+          typeof value === "string"
             ? value
-            : String(value),
-        });
+            : String(value)
+        );
 
         fastify.orm.em.persist(entity);
       }