Yu Yu Hakusho is begun while the 14-year old Yuusuke Urameshi, a juvenile delinquent who spends his time wagging school and being a legend at street fighting,saves a child from being runovered by a speeding car, and was onsequently killed. After his death, Yuusuke met Botan, a denizen from another world who sayed that there was no room in heaven or hell for him, as his death was totally unplanned and it was not his time to die yet.

Yuusuke balked at this, saying that he had died in place of the child, so why shouldn't there be a place for him? Botan told him that even though the child was meant to be hit by the car, miraculously he was not hurt in any serious way, and didn't die. So Yuusuke had dived in front of the car and killed himself for no reason at all. But because this was an extremely rare case, so Yuusuke was given another chance at life.

Yuusuke was then taken to Reikai (the name for the other world) to see the "person" in charge, called Koenma for a test, which he supposedly passed and hence was reincarnated as a spirit detective for the Reikai to catch criminals from Makai (the demonic world) and monsters who had sneaked into the Ningenkai (the humans' world). The test was actually a test of his virtues; it involved him carrying the egg of a ReikaiJyuu; an animal of Reikai. This ReikaiJyuu lives on the energy Yuusuke emits; if Yuusuke is kind-hearted, the the ReikaiJyuu will become an angel, but if Yuusuke is evil, the ReikaiJyuu will become a monster and eat him when it hatches. Yuusuke gives up the egg when Keiko is trapped in a fire, and because of this act he was reincarnated. The egg business vanishes for a while, but resurfaces when the egg hatches to reveal Yuusuke's likeness in mind; a blue penguin-like bird they dubbed Puu. As low as it render's Yuusuke's intelligence, this bird actually morphs into a cool-looking phoenix when Yuusuke undergoes transformation into a youkai.

As Yuusuke's powers increase, so does that of his enemies. He builds up a team of friends, some of which are demons themselves, and gets involved in demonic fighting tournament, Makai and rifts between worlds. Yuusuke's party generally became known to include four people. One of them is his eternal enemy/friend, Kazuma Kuwabara who too is a juvenile delinquent but has psychic talents. The other two are demons, They are the famous robber of today's Makai, Hiei, and the famous robber of yesteryear's Makai, Kurama. At the end, of course, they won the tournment.

But their trouble wasn't ended yet. The Demon-Real World hole becomes a problem.... Yuusuke and friends must fight to contain a hole that is forming between the Demon World and the Real World, eventually resulting in a major battle among Sensui, Itsuki, and other humans with special power and ability, who started the whole thing, verus Yuusuke and his teammates. Yuusuke died once more, but comes back to life ... because a demon lord was one of his ancestors. Thus Yuusuke is reborn as a demon and finally won.

Yuusuke then went off to meet his ancestor demon, Reizen. Kurama was recruited by rival demon Yomi, who was also teammate of Youko Kurama before he became Minamino Shuichi and is now the king of one of the three kingdom in Makai. Hiei, in the other hand, was recruited by another king....no, it's "she", so it's a queen, Mukuro. Kuwabara surprisingly began to study hard for high school exams!! There was trouble in the demon-world, and power struggle; to solve it all, Yuusuke, who has inherited a kingdom in the demon-world from his demon lord ancestor, went off to each of the other powerful lords, who are Yomi and Mukuro, and proposed a giant contest to see who'll get the rule. Just for fun. Just for the heck of it. Everyone agreed, and another contest began.

During the contest, Hiei was lost to Mukuro and Kurama was lost too in the 3rd round. And Yuusuke eventually lost the contest to Yomi after 60-hours-fight, and went back to the real world. In the meantime, the demon-world starts communicating with the human world, and some of the contestants from the first competition start becoming TV personalities. Really. Hiei stays in the demon-world with his lord/master, a young woman with a dark past, Mukuro. Kurama stays in the human world, learning about his step-father's business. Yuusuke opens a food stand. Kuwabara keeps studying. Although they're living in peace and usual lives, when there's trouble, these 4 psychic detectives must stand up and fight......

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