Chain Gang Girls

Chain Gang Girls (2007)
In Japan's toughest maximum-security female prison, the inmates outnumber the guards by 100 to one, and if Prisoner 42 hopes to survive her sentence she needs to stay clear of the vicious guards and the even more dangerous prisoners. This facility was designed just to hold the country's most ruthless criminals, and the population is ready to explode into a riot at any minute in this thriller set inside the rarely-seen Japanese penal system.

I like Japanese films but I'll admit a lot of them are guilty pleasures because they're really strange. Reaaally strange. Methinks this will be no different.