The older sister Miyu(Inaba) and the younger sister Kana (Nagisa) have left their parents' home and are living happily together. Their neighbor Sato, who looks at them with lustful eyes, targets Kana when she is alone one morning and calls out to her. "I have something I want to show you," he says, forcing the reluctant Kana into his house and raping her. However, that is not enough, and Sato's desire is also directed towards Miyu.