I don't read "Graphic Novels" myself, but my pal does. His favorite is a Manga novel called "Battle Royale" where kids are sent to a remote island, get an explosive collar put on their neck and are forced to fight eachother to death, Lord of the Flies style. If they don't fight, the collars explode. If they try to escape, the collars explode. If they don't kill someone every 3/4 hours, the collars explode.
Pretty sick, but my freind seems to like it.