Mayumi is sent to jail after brutally attacking her partner and his mistress. Sent to live in Cell 31, the women there couldn't be more different... they are very religious, sing hymns and discuss the Bible. A fight with a rival cell block starts a bloody and vicious war in the jail... one where the warden and guards seek vengeance on the women with brutal torture and sexual humiliation. When a new inmate arrives and Mayumi recognizes her, all hell breaks loose!

The movie takes place in four periods: the first, a group of female Christians are raped and crucified in 18th century Japan. The second deals with a man who beats his cheating wife and her lover. The third, and the most interesting, is set in WW2 where inquisition soldiers torture, rape and abuse female traitors, and the fourth story deals with soldiers raping and abusing suspected female spies.