Koji, who lives with his older brother and his wife, accidentally sees his sister-in-law changing clothes. His brother-in-law's eyes are burned into his eyes by his sister-in-law Ryoko's plump buttocks and large breasts, which make him captivated and tormented. Unable to bear his forbidden desire, Koji steals Ryoko's underwear and indulges in masturbation, but Ryoko finds him in the act. At that moment, Ryoko...