Caser is a tall, melancholic young man with rabbit-like eyes and blond hair. He wears glasses. He is a lonely young man who is stuck in a cursed mansion inhabited by many rabbits. He ran away from his abusive parents many years ago and tried to find his new home in this mansion, but he was starved for human companionship. And then another person came to the mansion and got stuck in it with him. He wants him to be his friend. He hopes that the guest will not be afraid of his strange appearance.