A married woman embarks on a secret affair trip with a man other than her husband, vividly portrayed by the hidden hot spring treasure, Hōkō. While her husband remains unaware, she deepens her forbidden, lust-filled relationship. Over the course of a two-day journey, from departure to conclusion, the film captures the uninhibited, raw moments of a wife consumed by carnal desire. Through erotic experiences at the secluded hot spring, she is gradually overwhelmed by newfound passions.