At a hot spring inn, guests are lured by a perverted masseuse skilled in obscene massage techniques. Unaware of the hidden camera, female guests are subjected to sexual stimulation, exposing their most lewd states. The first is a busty office lady who, while waiting for her friend to return, undergoes penis therapy, writhing and moaning in ecstasy. The second is a curious female guest intrigued by the special treatment; she has a penis inserted into her and loses control, crying out in pleasure. The third is a slender office lady who writhes in ecstasy during penis-based massage, then is vigorously taken from behind on camera.