Emi Tooda, a mature woman whose sexual desires have intensified with age, spends her days secretly satisfying herself alone. Unbeknownst to her, her son has been secretly watching her. One day, she begins cleaning his room without permission, sparking an argument. Feeling violated by her intrusion, her son decides to take revenge. He suddenly pins her down, forcibly removes her panties, and humiliates her on the spot. But unsatisfied with just that, he takes even further drastic actions.