In the anime tells about an isolated prison,which signed these "villains", as an honest fellow, fighter, otaku, secretive old prisoner, and of course the cat (or cat =) One day, all the locks on the cameras disappear, and the prisoners are "free". But is it really? After all, the guards strangely vanished, too, and outputs the same no more.At this point, it begins to happen mystical phenomena, people disappear, fear and panic raging in prison. Our heroes are desperately trying to resist all this, looking for a long-awaited way out to freedom. Will they get out of this situation or not, time will tell.