Yusuke Urameshi is having a typical day. He's cutting class, arguing with teachers and getting into fights with his rival Kuwabara. But then Yusuke does something that betrays his killer rep. He dives in front of a speeding car to push a little boy out of harm's way! Yusuke has sacrificed his life for the sake of another, but is this really the end of this brash young man?

Kuwabara was tormented by his rival's death. The loser in all 156 of his brawls against Yusuke , he's now lost any chance he ever had of evening the score! But with Yusuke out of the way, Kuwabara is the new kid to beat... which means he's making plenty of enemies. Yusuke isn't fond of this classmate, but if he wants to win back his life, he will need to give him a ghostly hand.

With two artifacts under his belt, Yusuke heads for his most dangerous challenge yet – the ruthless demon Hiei. But unbeknownst to Yusuke, Hiei is chasing him, and kidnaps his girlfriend Kayko! Unless Yusuke can retrieve the antidote inside Hiei's Shadow Sword, Keiko will become a brainless, monster slave! Can Yusuke close the case?

In his first match of the tournament, Yusuke faces an impossible disadvantage. He can't see a thing in the pitch-black arena, but a hi-tech helmet allows Kibano to follow Yusuke's every move. Even if the battle-worn detective can survive Kibano, he'll have to fight his second match immediately -— against a lethal ninja!

Suzaku uses The Prism of Seven technique to create seven Suzakus. Not merely copies, each one has independent will and full powers - all aimed at the torture and annihilation of Yusuke.

As Team Urameshi boards the ship, the preliminary round begins. The Masked Fighter is the one to fight, as she knocks out the demons with a Shotgun, causing a riot against Team Urameshi on the ship. The team then begins to fight, knocking out many demons, even killing a few, when they reach Hanging Neck Island. When they reach their hotel room, they are greeted by two mysterious characters, from Team Rikkuyukai, the team they are to face in the first round of the tournament.

Round two of the tournament arrives and Team Urameshi must face Dr. Ichigaki’s fighters, a group with a habit of chopping off their opponent’s heads! Will Yusuke be the doctor’s next guinea pig?

Kurama is unconscious, and getting beaten to death by Baken. The announcer Koto tries to give a 10-count to stop the fight, but Baken ignores her and kicks her out of the ring. Just as Baken is about to kill Kurama, the team captain, Risho, tells him to stop. As it turns out, Yusuke was about to fire his spirit gun right at Baken if he had tried to kill Kurama. Kurama then is tossed out of the ring. Baken is declared the winner. Yusuke then gets onto the ring to confront him. Baken uses a technique built from his sweat to cover the entire arena in mist, so Yusuke won't be able to see now. Baken delivers a few blows, but the barely harm Yusuke, and he then fires a spirit gun through the arena, causing the mist to vanish.

With both Ura Urashima and the newly transformed Yoko Kurama trapped in the ring, the true battle begins. Yoko finally shows himself, and unleashes an attack known as the Death Tree. Yoko Kurama demands that Ura Urashima tell him the secret of the Idunn Box. Ura says he doesn't know, and that he only joined Team Uratogi because Shishiwakamaru promised him riches. Yoko knows he's lying, and threatens to kill him. Ura finally starts telling the truth. He says that he's not even Ura Urashima,and both Kuro Momotaro and Makintaro weren't who they seemed either. That they were together when Shishi and Onji showed up, and he's about to say something else when a sword flies into the ring, and hits Ura, changing into a wolf-like creature. As the smoke clears, we see that it was Shishi that threw the sword. Juri then declares Kurama the winner. Shortly after the smoke clears, Kurama turns back into his regular form.

The tournament finals are set to begin. But the rules state that each team must have five members to compete. With each team having only four fighters, two competitors step up to join with each team no matter what the consequences. Who are the two new fighters and what could they possibly bring to the team?

During his match with Toguro, Kuwabara is told of Genkai's death. With extreme rage Kuwabara strikes Toguro with the Trial Sword splitting the demon in half! The arena watches in horror as the evil Toguro rises from the arena floor unharmed.

With the Dark Tournament at an end, Yusuke must beign to cope with the loss of his best friend at the hands of Toguro. After Sakyo asks Koenma to take his life, the evil billionaire unveils his final evil plan to destroy the entire stadium with everyone still inside!

Somewhere in Mushiyori City, a psychic is forging a tunnel between the Demon and Human worlds. Yusuke has recruited Murota, a mind-reading human. But while trying to weed out the enemies by their thoughts, Murota was shot -- and the criminal mastermind made his introduction. The heroes have taken Murota to the hospital, where new danger awaits.

Yusuke, Kurama, Hiei, and Mitarai enter a cavern controlled by the tricky Gamemaster. Gamemaster's territory can be manipulated into a video game, a game where everyone must play by the rules in order to survive. Yusuke's team must win 4 rounds to move on, but is a victory possible against an adversary who can manipulate the rules?

Koenma's tactics have saved Yusuke for now. But mysteriously Yusuke won't allow the Prince of Spirit World to use his pacifier. While they discuss their next move, the terrible gateway between Demon World and Living World opens.

Yusuke's body has undergone an intense transformation as his dormant demon blood takes hold. As the battle against Sensui concludes, Koenma tells Yusuke that he must choose between Demon World and Living World. Without hesitation, Yusuke makes his decision!