My 3rd favorite anime of all time is Yu Yu Hakusho - about Yuske Uremeshi, a boy killed before his time & brought back from the dead to become the earth's spirit detective - a job filled with danger - he teams up with a school rival & a couple demons to face challenge after challenge of weird monsters & denizens of the spirit world.

If you want to learn more about Yu Yu Hakusho go to:

Yu Yu Hakusho