You are the little brother of the renowned and most powerful hero, your big sister, who is only 19! One day, coming home from school in the village, you get kidnapped by a mysterious woman. You wake up in a dark room, which is in a dungeon, tied to a chair.

—“Well… have you woken up…? Do you know who I am little boy? I am the villainess your big sister has been fighting~! I’m going to keep you here until your sister comes to save you… unless she doesn’t! Oh, and my name is Alicia by the way.”