Freelance designer Manami is a free-spirited and independent woman who takes pride in her single life. Her nephew Tomohisa, with whom she shares a close bond, often visits her home, enjoying casual conversations that brighten his daily routine. One day, Tomohisa returns to Manami's apartment after forgetting his mobile phone, only to discover two male assistants engaged in a sexual act with her, witnessing her providing explicit sexual services. The shocking scene leaves a deep and unforgettable impression on him. From that moment on, he becomes determined to visit her home again, setting the stage for a new and intense development.