Oukoku game or Kingdom Game is worth the quick read it will take (Anywhere from 1 sitting to 3 days depending on your speed).

The story's a death game between multiple groups of people that involves an absolute hierarchy that shifts every day. For this reason the characters have to be political about ordering around their group mates.

The story has a good pace at first and then ACCELERATES like it's about to go out of print. I personally think that the author got bored with the story or funding was cut, but whatever it is, the story picks up the pace like a mo-fo later on.

If you liked Mirai Nikki and other thinking+regular human fighting death games then you should like this, even though it's nowhere near as good. It's a fun concept and a fun story.