Libra is a perfect world which rewards good actions and punish evil actions itself. Perfect, isn't it?
A young boy, Kaito, is trying to understand the world he’s living in when he gets caught in something way bigger than him. He has a strong believe that nothing is perfect and, well, he will soon learn that he was right.
"When evil becomes necessary, it is not longer evil. If the evil is necessary, it isn't evil. It's a sacrifice".