When Kimura, who runs a real estate business in the suburbs of Tokyo, was forced to live an abstinent life due to his wife's pregnancy, his wife's sister Risa went to school in Tokyo and let them live in the next room of the apartment where they live. Kimura, who was fascinated by Risa's open personality and young and plump body and desperately suppressed her sexual desire, found a secret camera set up by the manager who hired her. finally surpassed the limit of self-control and carried out a certain plan.