Health-conscious college student Ki U Aihara makes jogging a daily habit. Her neighbor, Mr. Kitagami, who has long resented her, seizes the opportunity one day when she takes out the trash, deliberately bumps into her, and falsely accuses her of causing injury. As a result, Ki U is dragged into Kitagami's home and gradually drawn into a depraved relationship. Possessing an innate masochistic nature, Ki U begins to feel pleasure from Kitagami's greedy sexual demands. Soon, Kitagami's friends become involved, pulling her into an increasingly lewd and intense series of encounters involving creampie, bukkake, facials, and gangbangs.