Spoilers for those who have not finished!
Me: I will not doing anything but make you smile
There once was a bunch of people who wanted to solve crimes. But now a few have lost there path so they create the major crime to solve they are the kira's! The worlds greatest detectives work to find and kill these kira's but sadly so many die trying. Those death's shall be mourned.
L: I am dead
Near: I am alive with my toys
Mello: I am dead without my chocolate
Matt: I am dead and wanting a smoke
Misa: No one must know
Light: I am in neither heaven nor hell
Matsuda: I am alive
Mogi: I am alive and a workaholic
Watari: I am dead but I died looking fancy
So many things and yet we all know why and how.