A teenager dies while saving a young kid and is given a chance to be resurrected, provided he works for the Spirit World as an investigator of supernatural crimes with his newly-given powers.

The story revolves around Yusuke Urameshi, who spends his days getting into fights and dies in an accident while trying to protect a young child. As he grapples with the fact that he is looking down on his dead body, a woman named Botan who calls herself a guide to the spirit world relays to him the shocking truth: no one expected a delinquent like Yusuke to die performing an act of goodness, and there was no place for him in either heaven or hell. Thus, Yusuke is given a chance to be revived, and after passing his trial, he becomes an Underworld Detective. From there, Yusuke becomes entwined in a mystery that envelopes the human, demon and spirit worlds.