Sons 'Akira' and 'Shinji' don't feel comfortable with their new mother 'Yumi'. One day, the two who witnessed the couple's work were stimulated by Yumi's lewdness that they saw there, and took advantage of it to aim for Yumi's body. Yumi was reluctant to accept it because she wanted to be recognized as her family, but she gradually felt pleasure in being at the mercy of her two sons.
