A hidden camera captures a two-day, one-night trip to a hot spring with a sex-starved wife and her lover. After not having sex with her husband for a while, she goes on an adulterous trip with a man she met on an app, looking for excitement. On the way, as she talks to him, she lets out a natural smile that she doesn't show in front of her husband. When they arrive at the inn, they can't contain their excitement and they become entangled in desire, their elation exploding even more. They enjoy sex while bathing and eating, flirting like lovers. They ignore their husband's phone calls and get so excited that they lose track of time as they enjoy the extraordinary.