A luxurious collaboration between four gorgeous mature women is complete! This is Kirioka Ryokan, a hot spring inn tucked away in a mountain valley. Suddenly, news of a death arrives at the inn. The owner, Mamoru, dies in an accident. And the head innkeeper, Kaoruko, announces her retirement. Everyone thinks that Ryoko will become the next innkeeper, but Kaoruko appoints her own daughter, Satsuki, who works in Tokyo, to the position. Satsuki works hard at the unfamiliar innkeeper's job, but Ryoko and Natsuko are not happy about this. As if to add insult to injury to the turbulent Kirioka Ryokan, a voyeurism scandal occurs...