Kashiwagi, a friend from school days, approached Mayu by lying that he was not interested in the opposite sex, and managed to get her to share a room with him. However, when he heard that Mayu had a boyfriend, he became enraged and said, "I'll make you regret living with me. This body is mine!" He squeezed her big ass while she was off guard, grabbed her beautiful G-cup breasts, and soiled Mayu's body with his accumulated sperm, causing her suppressed desires to explode. In an attempt to make Kashiwagi give up by persistently pursuing her, Mayu shows him passionate sex with her boyfriend in front of her eyes, but...