Mayumi Shinono - stiefmoeder verleidt haar stiefzoon

This is a secret love story between Mayumi, a stepmother who is treated like a servant by her husband, and her stepson who takes pity on her. Her stepson is getting married, and Mayumi spends her days masturbating in her stepson's underwear to stop her loneliness. On the very day her stepson leaves home to live with his fiance, Mayumi can't help but act on her secret feelings...