A female guest staying at a hot spring inn is called in by a masseur skilled in perverted massage techniques. Unaware she is being secretly filmed, she gradually becomes aroused during the massage, eventually accepting his penis and writhing in ecstasy. The first woman is a flexible, huggable college student who openly expresses pleasure in response to the sensual treatment. The second is a fair-skinned, beautiful apparel saleswoman who, upon hearing that other guests have received similar treatments, naturally gives in as his cock penetrates her, moaning in delight. The third is a slender, big-breasted woman in her thirties, an office lady who hesitates at the obscene chiropractic session but whose body betrays her—her large breasts bouncing with each thrust as she succumbs to pleasure. Each woman is a different type, realistically portrayed as they gradually give in to desire.