You are LightE Kogami, currently incarcerated for the murder of your wife. This might be a plot hatched by Locker, who has his own motives. Also, Locker has hired guards to make your life a hell in the prison. All the guards work for Locker now.
All of your actions will have a consequence in this game and you need to think a few steps ahead to get out of the pinch.
What you need to look up to the most in this game is the interrogation related chapter.