A gorgeous co-starring work of four superb beautiful mature women is completed!This is Kirioka Ryokan, a hot spring inn that stands quietly in a certain mountain valley.Sudden obituary comes to such Kirioka Ryokan.Accidental death of master Mamoru.And Kaoruko, the grand proprietress, announces her retirement.Everyone thought that Ryoko would be the next proprietress, but Kaoruko appointed her real daughter, Satsuki, who works in Tokyo.Satsuki works hard at her unfamiliar landlady job, and Ryoko and Natsuko don't like it.As if to add to the turmoil of Kirioka Ryokan, a voyeurism riot occurs.