It's about a high school student getting a notebook that can kill people sa pamamagitan ng just Pagsulat their name in it. So he uses it to make the world a better place sa pamamagitan ng killing all the criminals. But a detective named L is trying to catch him because he is a murderer. i know that is a suckish way of explaining it but that basically what it's about. But either way it's addictive.
It's about a normal high schooler who gets a magical notebook that kills people. He decides to go on a mass murder spree and slaughter hundreds of thousands of criminals.(Seriously? Who wouldn't?) He then meets a shinigami with a serious mansanas addiction and battles an insane, yet oddly awesome detective.