Nami, who's been dealing with pent-up desires due to her husband's business trip, finds release through exercise. One day, while training with her son's athletic friend, Hiroki, she can't resist teasing him with her unguarded appearance, her playful nature getting the better of her. What started as a casual fling turns into an endless cycle of intense orgasms as Hiroki's insatiable stamina keeps him coming back for more, driving her to the brink of madness. Her body, now accustomed to such extreme pleasure, eventually cries out in ecstasy...