Yu Yu Hakusho

Yu Yu Hakusho is about a boy named Urameshi Yusuke who died after saving a boy who will be run down by a car. After he died he met Botan from Spirit World and took him with her to meet Koenma the ruler of Spirit World and the son of king Enma. Then, Koenma promise to bring him back to life, after that he make Yusuke to become a spirit detective. With the help of Kuwabara Kazuma, Kurama and Hiei they fight demons and evils. The fighting here is good and I recommend you should watch this series.