Shiori and Masaru, childhood friends who grew up in a small village, got married. However, the village had an ancient custom where if a couple could not conceive a child within six months, sexual intercourse would be performed by a "Breeding Master." Masaru falls into despair as he watches Shiori being taken by another man right before his eyes. Meanwhile, Shiori finds the sex with the Breeding Master so pleasurable that she begins to visit him of her own accord time and time again...