Every night while he bathes, a forbidden betrayal happens just outside the door.

Tsukasa Aoi stars as a wife living a double life under her husband’s roof. Every night, during the thirty minutes her husband spends in the bath, Tsukasa surrenders to the relentless advances of her father-in-law. The film focuses on the high-tension atmosphere of this recurring betrayal, as the two engage in a secret, physical relationship just a few feet away from the unsuspecting husband. What began as a moment of weakness has become a daily routine of carnal desire, leaving Tsukasa trapped between her duty as a wife and her submission to her father-in-law's lust.