"You will receive sex training until you become gay." This prison guard might be sadistic, but like it or not he'll make you cum with his superior techniques! Natsuki, a host-club worker and womanizer, has somehow traveled into the future… a future where heterosexuality has been outlawed due to overpopulation! Natsuki is immediately arrested and locked up in the "Penile Penitentiary", where straight men are turned gay. There are physical examinations, as well as submission training, and anal development… Under the sadistic tutelage of the sexy guard, Natsuki finds himself beginning to enjoy the touch of another man… What will happen to him?!