The main character of this graphic novel is 14-year-old bully named Yusuke Urameshi. The series is mainly about him who - upon dying - is given the opportunity to come back to life, yet only on a condition: he has to become a Spirit Detective for the dead realm. His tasks include nabbing villians who are Yokai (or demons) and the like, but his name goal is protecting the Human Realm from the Demon Realm.

I've yet to read the entire manga (only the volumes with Jin), so I won't say much in this section.

Buy the manga at Amazon.
Download the manga at Mangaspot.