The heart and body of a married woman sway with the waves of an onsen, drawn into a journey of infidelity. Taking advantage of her husband's business trip, she sets off on a two-day, one-night journey seeking freedom. Liberated from the constraints of daily life, she finally responds to a man's desire. Her trembling body, overwhelmed by her own beauty, convulses each time she's penetrated by his cock, climaxing again and again. Sharing dinner and passion, their night is interrupted by an urgent call from her husband demanding her return. Flustered, she rushes back home. Three weeks later, reunited once more, the two can't forget the lingering passion from their trip and now crave each other even more intensely.