At a hot spring inn, the masseuse summoned by guests specializes in perverted, obscene massages. One after another, female guests unaware of the hidden camera are drawn into waves of pleasure under her skilled hands. The first is a charming, sensual office lady, depicted writhing in ecstasy as her erogenous zones are stimulated, then shown fully immersed in pleasure as she receives the man's penis. The second is a young, slender clothing store clerk who, though initially confused as her genitals are fondled, can't suppress her arousal and is vividly portrayed being thrust into by a thick cock. The third is a bespectacled married office lady, convinced this isn't infidelity, who consents to "penis therapy." She is portrayed blushing with shame yet convulsing in passion, surrendering to intense pleasure. Each woman displays unique reactions as they are realistically drawn into a world of overwhelming sensation.