All roles are played by adults. A father-in-law falls in love with Naoko, his son’s wife—the one woman he should never desire. He watches her daily life, fantasizes about her, and even spies on her having sex with his son and masturbating alone. One day, while he is peeping at her touching herself, Naoko suddenly speaks: “Dad, I’ve known all along that you were watching.” But instead of getting angry, she invites him closer...