Kûga no ori: Nami dai-42 zakkyobô (2007)

It looks like any other prison, but this specialized penitentiary was designed from the ground up to hold Japan's most ruthless female inmates. That makes it doubly deadly, because while the guards may be brutal and sadistic, the inmates outnumber them by a hundred to one! At any second the final, fatal riot may erupt, stoking the flames into an all-consuming inferno where it's every woman for herself!