The book I'm reading right now is a Japenese translated book titled Battle Royale by Koushun Takami. It is about a group of students who are sent to an island to fight until all but one of them is dead. They kill each other, and it is a government run program experiment. It's similiar to the Hunger Games by Suzanne Collins, if you've read it, although Battle Royale was published first.
Similarly, if you haven't read the Hunger Games, I highly suggest that you get right on it. Both books are full of gore and blood. Amazing reads.