One day, a criminal decides he's going to go on an all out rampage, causing destruction upon everything and everyone that he passes by. He manages to talk a number of other criminals into joining him through the use of manipulation and broken promises. Together they decide they are going to overturn the prison to get revenge for ever being forced here in the first place.
It is then that everyone on the Defense Force realizes that they have to take matters into their own hands. The wardens cannot be relied on. Every person on combat finally gets to do what they've been waiting for — use their combat skills like never before, at least within the prison.
There is some bloodshed everywhere, but the Defense Force manages to keep it under control — or so they thought, until sooner or later they discover that the villains have installed bombs in various locations. One by one these bombs start going off, and unfortunately it takes down some of the combat team. It is the sacrifice we all make by being on the Defense Force.
I could go on but now is not the time to give away the spoilers, or how the story ends.