Ryoko watches over her husband who is busy with work and devotedly cares for her aging father-in-law. She didn't say anything about her loneliness and relied on the few nights she spent with her husband, but one day, an accident robbed her of her husband. And when a month has passed and she is thinking about sorting out her feelings, a man suddenly comes to collect the debt her husband left behind. Looking at Ryoko's distressed appearance, her father-in-law tried to pay off her debt, but from that day on, Ryoko, who was taking care of her, began to relentlessly demand obscene acts.