People in the prison call Matsu "Scorpio," and she's been locked away inside the prison as punishment for messing with the operation of the prison and for her attack that left her scarred. Due to the visit of a dignitary, she was given a one-day reprieve. She took advantage of it and attacked the warden again, though. This leads to harsher punishment and humiliation, so it's better not to do this. Punishment, however, gives her a chance to get out with six other women who are in prison. People who have been in prison for a long time are put in a fight with the guards, the warden, and each other in their "surreal" escape.