After his debt-ridden father disappeared, he decided to live and work at an inn to pay for his mother's medical expenses. One day, a demon comes and steals a customer's wallet. Her senior maid, who is in love with Haruka, sees it, but she bears the sin that she did it. Her senior maid was subjected to lewd chastisement by the landlady of her inn as her punishment, and for that reason Chiharu was forced to have a physical relationship with her. Out of guilt, she becomes obedient. Her senior maid's demands escalate day by day.
