Kangoku Onna: Dasshutsu Fukanou no Injoku Shisetsu

"The prison island is reborn as a facility of inescapable fornication." It was a locked down island fortress. Nobody ever got free. As long as it had been home to criminals, jailbreaks were attempted. They all ended in failure. The prisoners didn't give up, and had a final plan. If they couldn't get past the guards and the barren walls, they...