The masseur summoned by a female guest staying at a hot spring inn specializes in perverted, obscene massage techniques. Unaware of the hidden camera, she proceeds to stimulate her clients' bodies, exposing their lewd behavior. The first client is a short-haired office lady who, despite initial suspicion, gradually succumbs to pleasure from the penis-based treatment, moaning loudly and writhing in ecstasy. The second is a fair-skinned milf in her thirties who willingly accepts long-lasting penis therapy, trembling as her large, shapely breasts jiggle beautifully. The third is a 20-year-old female college student who shows curiosity at first, then becomes increasingly aroused during vaginal massage, losing control and convulsing with pleasure each time she is penetrated by the penis.