Aki, a wife, returns to her husband's parents' home with her husband for the first anniversary of her mother-in-law's death. Her father-in-law Koichi, who has had his eye on Aki for some time, pretends to have mistook her for his dead wife and pushes Aki down and rapes her. Unable to confide in her husband, Aki worries alone. Knowing this, Koichi wonders if there's some way he can have sex with Aki again while she's at his parents' home, and he puts a despicable plan into action...