Mio on her son Hiro. Hiro is a quiet boy who is bullied by his bad classmates, but one day, unable to bear it any longer, he pushes Masato, the leader of the bad boys, injuring him. Masato brings his father to the house and demands an apology from the Kimajima family. Masato's father gets angry and threatens to take his case to the school, but he sets his sights on Mio's lewd body and offers to forgive him if she serves him with her body. Mio is Mio, but ends up having a relationship with him for her son's sake. However, Masato secretly films the whole affair, and the busty wife becomes the sexual prey of the bad boys...