This erotic drama depicts the forbidden physical relationship between a wife whose husband is sickly and bedridden, and her father-in-law, who supports his son and daughter-in-law. Azumi, who has been sexless since her husband fell ill, is feeling a burning throbbing in her lower body. One day, as she peeks at her father-in-law getting changed, his erect penis catches her eye. At night, the wife indulges in masturbation, remembering her father-in-law's penis. Her father-in-law watches the act from the next room. Wanting to satisfy his daughter-in-law's feelings, the father-in-law forcibly opens the forbidden door. At first, the daughter-in-law is confused, but gradually becomes captivated by her father-in-law, and begins to desire him herself, because it's forbidden. After all, this world is about men and women, and unstoppable desires swirl under the same roof, in a world of immorality and lust.