Called to a hot spring inn, the masseuse specializes in perverted, obscene massages. Unaware of the hidden camera, she performs bold sensual treatments on female guests, exposing their lewd states. The first is a young wife who, initially hesitant, succumbs to pleasure and consents to cock therapy. The second is a slender 30-year-old office lady, overwhelmed by waves of pleasure as a penis penetrates her, moaning in ecstasy. The third is a woman in her late twenties, a company employee, tricked into accepting internal massage, writhing in agony as the penis thrusts inside her. Each woman undergoes treatment for different reasons, their reactions vividly captured.