On a Saturday afternoon, new office lady Miwa, the mistress of her married section chief, visits his apartment where he lives alone. Already wet and eager for sex, she prepares a home-cooked meal completely naked underneath. As the erotic tension builds between them, Miwa takes the initiative to pleasure her boss with his morning erection, indulging in a full 24 hours of aggressive, passionate sex. Their intense desire for each other grows deeper with every passing moment.