Mina always complains that her boyfriend doesn't produce much sperm during sex. She becomes close with her neighbor Sato (the man with the balls), and is drawn to his massive ejaculations. She masturbates to induce an ejaculation. She is so moved by his vivid ejaculation that she even has sex with him. Mina is mesmerized by the massive bukkake, semen, and creampie, and she becomes a slave to the man with the balls...