Yumi, a married woman, is struggling with the fact that she and her husband cannot have children, despite their seemingly stable marriage. Realizing that orgasm is essential for conception, she becomes dismayed by the lackluster sex she has with her husband. One day, she runs into her ex-boyfriend by chance, who invites her back to his place. Though initially hesitant, Yumi follows him to his room. Swept up by his passionate advances, she finds herself unexpectedly aroused, experiencing intense sex unlike anything she's ever known. Awakening to this new pleasure, she begins to feel emotions stirring within her.