The Crimson Princess of the Twilight Fortress

Princess Garnet, the 'Crimson Princess', had been sent away to the Twilight Fortress, a solitary frontline where monsters run rampant. The fortress's inhabitants are not soldiers, but prisoners, whose crimes are awaiting investigation and punishment. Interrogate them and punish them for their crimes, and if not cooperative... she has the permission to use more 'unconventional' measures.