Rinka, the beautiful daughter-in-law, accidentally injures her father-in-law, Teiichi, and out of a sense of responsibility, decides to take care of him personally. Teiichi, a man with a careless personality and a notorious history with women, begins developing a growing interest in Rinka. He starts harassing her with inappropriate acts—handling her private care, spying on her in the bath—and his power harassment intensifies day by day. Eventually, he overpowers her and forces himself on her against her will.