The chaste married woman Ryu goes on a one-night hot spring trip with her husband. Her only problem is... Her older husband has been experiencing an end recently and has begun to feel dissatisfied with her nightlife. At the hot spring inn where she is traveling, she encounters an incident that she must never keep secret from her husband. He was taken over by bad guys who were staying at the same inn. The woman's body, even though she knows it's not good... Eventually, she even gets fucked anus, which even her husband has never touched.