In a certain hot spring town, married women struggling with infertility begin receiving instruction from a master of ancient sexual techniques as an alternative to medical treatment. Under the guise of fertility enhancement, the training involves various lewd acts that gradually seduce each woman. The first woman reaches climax while having her genitals stimulated as part of a "vital energy" exercise in the bathroom. On the futon, she writhes in ecstasy as a man thrusts his penis deep inside her. The second woman is a slender, black-haired, shaved-pussy housewife. She squirms in pleasure as her erogenous zones are stimulated to boost female hormone secretion. She screams with delight as the man vigorously pounds her with his cock. The third woman is fair-skinned, slender, and shy by nature. She obediently allows the man to touch her genitals, moaning softly. She sincerely accepts his penis, riding him in cowgirl position as he thrusts upward from below, bringing her to heavenly orgasm.