In a fictional Japan desperate to reverse its falling birthrate, a law punishes men who remain sexually inexperienced. One reported man is arrested and imprisoned, then placed at the mercy of a sadistic, huge-breasted, sex-crazed adult school-uniform role-play officer eager to breed. The statute requires every Japanese man to have sex with a partner before age thirty; anyone declared a virgin is confined in a special prison and sentenced to years of forced semen extraction. With no scientific test available, suspicion begins with a woman’s intuition and police investigate the accused man’s relationship history before sentencing.