Mayumi has raised her only son as a single mother. It was Mayumi's trouble that her son Masashi's appearance was strange recently. Masashi didn't say anything to listen to her story, but when he was in trouble, his son's friend showed him a shocking video of Masashi. Mayumi is threatened by her friend that Masashi's position will be in jeopardy if this continues, and she accepts her sexual demands on the condition that she won't tell anyone. From there, Mayumi and Masashi's downfall begins...
