In the near future, female frustration has reached its limit, leading to a strict system where men compete against each other while their sperm is tightly controlled. Female prisoners sentenced to hard labor are forced into restricted work involving regular sperm collection. Female nurse guards, who secretly add arousal-inducing components to their own urine, make the inmates drink it to heighten their sexual desire, ensuring repeated sperm collection in strict accordance with a predetermined cycle. Under this system, the extremes of human desire and control are exposed.