Eight hours of her son playing innocently with his friends at the public pool. His mother, Kitano Mina, indulges in forbidden extramarital sex with her son's swimming coach in the changing room and a private hotel room. Embracing the coach's well-trained, muscular body, she moans lustfully in the presence of her son, feeling a sense of immorality. With the faint smell of chlorine in the air, she forgets she is a mother and transforms into a woman consumed by lust. Her orgasms, in the midst of her son's laughter, plunge her into an even deeper abyss of pleasure.