Yumi and her son's physical relationship began about half a year ago. - The trigger was that he was witnessed masturbating and was forced to push me down. - Since then, Yumi has repeatedly had incestuous relationships with her son as he requests, but she decides to break off the relationship, saying, ``If things continue like this, my son will become useless.'' - But it was already too late. - When Yumi announces the end of their relationship, her son's attitude suddenly changes and he begins to treat his mother coldly. - Yumi, who can no longer endure such everyday life, goes to her son herself...