Watch Yu Yu Hakusho: Spirit Detective Saga
"Yu Yu Hakusho: Spirit Detective Saga" (1992) is the first season of the anime "Yu Yu Hakusho." It is based on the manga of the same name. In it, Yusuke, a teenage delinquent dies prematurely after saving a young boy from being hit by a car. As there is no place for him in Heaven or Hell, he cuts a deal with Koenma, the prince of the Underworld, to return to his body after a series of tests. Koenma then makes Yusuke a "spirit detective," which means he now has the job of investigating supernatural activity in the mortal realm. As such activity often comes from demons, Yusuke and his allies often have to stop it.