In a quiet afternoon at a 60-year-old wooden Showa-era apartment, married woman Kokona indulges in a secret pleasure all alone. Her marriage was a youthful mistake, and her husband's possessive nature has forced her to keep emotional distance. For her, the only solace comes once a month—the illicit tryst with her visiting massage therapist. The therapist's persistent, teasing caresses gradually ignite her passion. Biting down on a towel to stifle her moans, she surrenders to overwhelming pleasure. Though wary of neighbors nearby, her uncontrollable desire surges, and she fully embraces the moment with deep satisfaction.