Shinobu Himeno (the beautiful Shinobu Wakana) is a sweet young florist from Tokyo whose boyfriend ends up throwing her into prison, unjustly accused of complicity in armed robbery. Evidently, despite her innocence, all kinds of sexual and physical abuse will be perpetrated in the women's penitentiary, not only by the veteran inmates, but also by the corrupt guards and the warden herself. Rape, sadism, degradation… everything serves to intimidate the newest and weakest, who, in turn, become informers for the guards, in order to obtain a promised parole that never comes. The situation becomes unsustainable for everyone, and the place eventually explodes into a riot that leads to drastic and much-needed changes.

Junichi Suzuki's film aims to expose the supposedly corrupt operation of the Japanese prison system, but above all, it uses the flashback technique to explain, in a very concise but effective way, the reasons why each inmate ended up locked up there. From murderous jealousy to revenge for mistreatment and violence, the inmates must pay with their flesh for the injustices of a macho, medieval culture. The Japanese paradox is once again revealed here in the hypocritical way we're used to: while vending machines on the street sell us dirty underwear for our personal "delight," it turns out that showing any genitals is totally unacceptable and reprehensible. That's why, although we see very hot and erotic scenes here, we'll never know if, in reality, they're all eunuchs.