Suzu and her brother are bothered by the behavior and noise of the bad boys. Suzu's body is played with by bad boys while her brother is away. His brother comes home, but when he sees Suzu's condition, he stands there unable to do anything. An older brother gets excited when he sees his younger sister being fucked. The brother indulged in masturbation while watching his girlfriend's sister. And Suzu also feels the situation and gets addicted to the depths...