While struggling with infertility, a group of married women encounter a man skilled in ancient sexual techniques at a hot spring town. Under the guise of fertility guidance, he subjects them to lewd treatments that one by one seduce them. First is a modest, big-breasted beauty who believes in preparing her body for pregnancy, writhing in ecstasy as she's mounted and vigorously pounded. Second is a chubby, baby-faced wife who convulses during sensual massage and reaches climax as she's taken from behind. Third is a woman desperate to conceive, who submits to indecent therapy, her eyes rolling back as she's used by the man's cock, achieving multiple consecutive orgasms. Each woman, in her own way, is drawn into overwhelming, depraved pleasure.