diff --git a/schema/init/idz.sql b/schema/init/idz.sql
index 9084f02..6252169 100644
--- a/schema/init/idz.sql
+++ b/schema/init/idz.sql
@@ -278,3 +278,12 @@ create table "idz_weekly_missions" (
     "progress_right" integer not null,
     "params_right" integer not null
 );
+
+create table "idz_my_chara" (
+    "id" integer primary key not null,
+    "profile_id" integer not null
+            references "idz_profile"("id")
+            on delete cascade,
+    "my_chara_no" integer not null,
+    constraint "idz_my_chara_uq" unique ("profile_id", "my_chara_no")
+);
diff --git a/schema/migrate/M0017-idz-v2-support.sql b/schema/migrate/M0017-idz-v2-support.sql
index 8a88986..d04bffb 100644
--- a/schema/migrate/M0017-idz-v2-support.sql
+++ b/schema/migrate/M0017-idz-v2-support.sql
@@ -1,3 +1,12 @@
+create table "idz_my_chara" (
+    "id" integer primary key not null,
+    "profile_id" integer not null
+            references "idz_profile"("id")
+            on delete cascade,
+    "my_chara_no" integer not null,
+    constraint "idz_my_chara_uq" unique ("profile_id", "my_chara_no")
+);
+
 create table "new_idz_settings" (
     "id" integer primary key not null
             references "idz_profile"("id")
diff --git a/src/idz/userdb/model/base.ts b/src/idz/userdb/model/base.ts
index 21e0b94..e15d7ce 100644
--- a/src/idz/userdb/model/base.ts
+++ b/src/idz/userdb/model/base.ts
@@ -4,6 +4,7 @@
 export type BackgroundCode = number & { __brand: "backgroundCode" };
 export type CourseNo = number & { __brand: "courseNo" };
 export type ExtId<T> = number & { __extId: T };
+export type MyCharaCode = number & { __brand: "myCharaCode" };
 export type RouteNo = number & { __brand: "routeNo" };
 export type StampCode = number & { __brand: "stampCode" };
 export type TitleCode = number & { __brand: "titleCode" };
diff --git a/src/idz/userdb/model/index.ts b/src/idz/userdb/model/index.ts
index 4802903..de2c806 100644
--- a/src/idz/userdb/model/index.ts
+++ b/src/idz/userdb/model/index.ts
@@ -2,6 +2,7 @@ export {
   BackgroundCode,
   CourseNo,
   ExtId,
+  MyCharaCode,
   RouteNo,
   StampCode,
   TitleCode,
diff --git a/src/idz/userdb/repo.ts b/src/idz/userdb/repo.ts
index 55e1935..2e88570 100644
--- a/src/idz/userdb/repo.ts
+++ b/src/idz/userdb/repo.ts
@@ -177,6 +177,8 @@ export interface Repositories {
   // not really a facet tbh
   missions(): FacetRepository<Model.MissionState>;
 
+  myChara(): FlagRepository<Model.MyCharaCode>;
+
   profile(): ProfileRepository;
 
   settings(): FacetRepository<Model.Settings>;
diff --git a/src/idz/userdb/sql/index.ts b/src/idz/userdb/sql/index.ts
index 486a908..953f93f 100644
--- a/src/idz/userdb/sql/index.ts
+++ b/src/idz/userdb/sql/index.ts
@@ -3,6 +3,7 @@ import { SqlCarRepository } from "./car";
 import { SqlCharaRepository } from "./chara";
 import { SqlCoursePlaysRepository } from "./coursePlays";
 import { SqlMissionsRepository } from "./missions";
+import { SqlMyCharaRepository } from "./myChara";
 import { SqlProfileRepository } from "./profile";
 import { SqlSettingsRepository } from "./settings";
 import { SqlStampsRepository } from "./stamps";
@@ -43,6 +44,10 @@ export class SqlRepositories implements Repo.Repositories {
     return new SqlMissionsRepository(this._txn);
   }
 
+  myChara(): Repo.FlagRepository<Model.MyCharaCode> {
+    return new SqlMyCharaRepository(this._txn);
+  }
+
   profile(): Repo.ProfileRepository {
     return new SqlProfileRepository(this._txn);
   }
diff --git a/src/idz/userdb/sql/myChara.ts b/src/idz/userdb/sql/myChara.ts
new file mode 100644
index 0000000..6060b96
--- /dev/null
+++ b/src/idz/userdb/sql/myChara.ts
@@ -0,0 +1,52 @@
+import sql from "sql-bricks-postgres";
+
+import { MyCharaCode } from "../model/base";
+import { Profile } from "../model/profile";
+import { FlagRepository } from "../repo";
+import { Id } from "../../../model";
+import { Transaction } from "../../../sql";
+
+export class SqlMyCharaRepository implements FlagRepository<MyCharaCode> {
+  constructor(private readonly _txn: Transaction) {}
+
+  async loadAll(id: Id<Profile>): Promise<Set<MyCharaCode>> {
+    const loadSql = sql
+      .select("mc.my_chara_no")
+      .from("idz_mychara_unlock mc")
+      .join("idz_profile p", { "mc.profile_id": "p.id" })
+      .where("p.id", id);
+
+    const rows = await this._txn.fetchRows(loadSql);
+    const result = new Set<MyCharaCode>();
+
+    for (const row of rows) {
+      result.add(parseInt(row.my_chara_no!) as MyCharaCode);
+    }
+
+    return result;
+  }
+
+  async saveAll(
+    profileId: Id<Profile>,
+    flags: Set<MyCharaCode>
+  ): Promise<void> {
+    const existing = await this.loadAll(profileId);
+
+    for (const flag of flags) {
+      if (existing.has(flag)) {
+        continue;
+      }
+
+      const saveSql = sql
+        .insert("idz_mychara_unlock", {
+          id: this._txn.generateId(),
+          profile_id: profileId,
+          my_chara_no: flag,
+        })
+        .onConflict("profile_id", "my_chara_no")
+        .doNothing();
+
+      await this._txn.modify(saveSql);
+    }
+  }
+}