Yu Yu Hakusho (full anime)

Yusuke Urameshi, 14 years old, is about as troublesome and violent as teenagers come. He is constantly ditching school, causing problems for authority, and getting into numerous fights. One day however, he does the unexpected: sacrificing himself to save a young child. Such an action was never expected, especially coming from someone as troublesome as Yusuke. The afterlife is not prepared for Yusuke, as they never thought he would make such a sacrifice. Nowhere to go, and dead, Yusuke becomes a ghost and must earn his way back into existence.

Yusuke is "employed" by Koenma, who is in charge while his father and ruler of the afterlife, King Yamma, is away. Under Koenma's command, Yusuke helps to stop menacing apparitions that threaten the lives of people everywhere - whether by stealing priceless and invaluable items and destructive weapons, or by wreaking havoc on humans.

Throughout Yusuke's journey, he is usually joined by his arch-rival, and local bully, Kuwabara Kazuma; he is also joined by two demons named Hiei and Kurama, who are ex-convicts of the spirit world that managed to reform under Koenma.

This group of unlikely allies goes on to participate in battles that may determine the fate of humanity!

Yu Yu Hakusho is created by popular mangaka Togashi Yoshihiro, who is also responsible for creating the acclaimed and much-loved series known as Hunter X Hunter.