A married woman's heart and body swaying in hot spring waters and in love. Mio, mother of three, currently living apart from her children, finds herself unable to sort through her tangled emotions—her tense demeanor both endearing and heartbreaking. As the outdoor bath loosens her inhibitions, she's approached by a man and, blushing, gives in. A naturally submissive woman, she melts under his verbal teasing, soon whispering bold words of her own as pleasure consumes her. By night's end, the emotional burdens are washed away, and by morning she embraces sex with a bright, liberated smile. Riding him in cowgirl position, grinding her hips with abandon, her lustful, captivating form leaves viewers entranced.