After Shoko loses her husband to illness, she sits in a daze before his memorial portrait while her adult son Hajime handles the mourners. That night, Hajime grows suspicious when he finds his mother alone with his uncle and secretly listens from behind a sliding door. He discovers that she is sleeping with the uncle in return for financial support. Hearing her moan before his father's portrait fills him with lust and possessive jealousy, and he refuses to let his uncle take her away in this taboo adult family role-play.