Futa Club is a very peculiar Japanese high school club, all but one member of which are girls with both vaginas and penises. The odd one out is Niimura Akane, a cheerful and enthusiastic girl looking for new forms of sexual stimulation. One day, Akane is scouted by the scholarly-looking vice chairman of the futa club, Oohashi Sumika. Thus begins Akane’s life as the club’s personal “dick sleeve”.