At a hot spring inn, guests are lured by a perverted masseuse skilled in lewd, obscene massages. Unaware they're being recorded, female guests are stimulated and exposed in their most intimate moments of sexual pleasure. The first guest is a big-titted esthetician who, under the influence of alcohol, accepts vaginal massage and trembles as she's penetrated by a man's cock. The second is a woman in her mid-twenties, an office lady whose beautiful breasts are massaged until she gasps for breath, then writhes and screams as the penis enters her. The third is a young office lady traveling alone, claiming she needs treatment for a back injury sustained at her company's sports day, but in reality, she willingly takes the man's cock, her hips thrusting violently as she's pounded.