Yusuke Urameshi, a rebellious teenager with little respect for rules, dies while saving a child from an accident. Because his death was never expected by the spirit world, he is given a chance to return to life and later becomes a Spirit Detective. Tasked with investigating supernatural incidents and confronting demons that threaten humans, Yusuke is gradually joined by Kuwabara, Kurama, and Hiei. Through missions, tournaments, and conflicts involving the Demon World, he develops his own powers while discovering that the boundaries between humans, spirits, and supernatural beings are far more complicated than he ever imagined.