Aki is a married woman, but she was brought to a secret hot spring inn deep in the mountains by the man she is having an affair with for a hot spring trip. In fact, the inn is famous for peeping and orgies, and the other hot spring guests came for that purpose too. The man who brought Aki thoroughly trained her, who has masochistic tendencies, and also planned to have an orgy with the hot spring guests so that he could watch her being used as a plaything by strange men.