You are already dead.
But you live on in the spirit world.
It's only how long you can last with the guilt.
Yusuke did what some call a 'good deed'. He but saved a child from a car driven by wreckless mortals. Yusuke died. But he was taken up again in the spirit world. Now he fights with his spirit gun with his friends. Kurabara being his true friend. Kurama and Hiei being but teamates. They each have their stories which will be revealed when I don't have to go to school tomorrow. But here is some fanart of this anime.
