Yumi, a wife, is dissatisfied with her brother-in-law Keiji, who stays at home and does little work. She tells her husband to do something, but he is not reliable at all and ends up spoiling her. Then, Yumi catches a cold and is bedridden. Keiji, who has always found his nagging sister-in-law annoying, doesn't miss this opportunity and pushes her down in one go... Yumi is too weak to resist and her voluptuous body is violated. However, Keiji's revenge doesn't end there...