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.

The candidates for Genkai's apprenticeship have been narrowed to eight. Among them: Yusuke, Kuwabara, and the disguised demon Rando! Genkai announces the final test will be a tournament, fought in total darkness. And Kuwabara's first opponent is swinging a supernatural sword!

Kurama and Hiei, two demons Yusuke beat in his first case, join Yusuke and Kuwabara to battle the Saint Beasts. This awkward alliance must learn to trust each other quickly, as they struggle through the Gate of Betrayal. And waiting just beyond this trap is the first Beast —- a giant made of solid stone!

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.

Botan, Keiko, and Shizuru, Kuwabara's sister, arrive at the tournament site to watch Team Urameshi duke it out with their first opponents, Team Rikkuyukai. Koenma is there as well, and reveals an adult form, to impress everybody since he's tired of being called a toddler. Everyone takes their seats, and the kid with the colorful outfit, whom Team Urameshi met last night, Rinku, steps up to take the first match. Since Yusuke still seems to be asleep, Kuwabara takes the first match. The match begins, and Rinku demonstrates his incredible speed by running in flashes around Kuwabara. Kuwabara's training pays off, however, when he can easily detect Rinku's movements. He deals him a few crushing blows, and it looks like Rinku is down. He grins, though, standing back up and telling Kuwabara he was just playing around to begin. He reveals his true weapon, eight Yo-Yos, four for each hand. He launches them forward to Kuwabara. Kuwabara reveals his newly-improved weapon, double Spirit Swords.

Yusuke and Chu, both drained of their Spirit Energy, struggle to win the first round of the Dark Tournament for their team. They agree to settle it with a Knife Edge Death-Match, an intense and fatal arena of combat.

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.

Shortly before the final round of the Dark Tournament, Yusuke's mentor Genkai was killed, leaving him with all of the Spirit Power she possessed. Since then Yusuke and his crew have been rigorously training for the upcoming battle. Suzuka, a member of the recently beaten Team Uraotogi, has helped by offering two very powerful, yet unstable weapons, hoping that Team Toguro will finally taste defeat.

The ultimate showdown between Yusuke and Toguro finally begins, and everyone is on the edge of their seats -- at least everyone that hasn't been melted into their seats by Toguro's intense Spirit Energy. Yusuke reveals the power he inherited from Genkai with a colossal blast of his Spirit Gun, but is it enough to bring down Toguro once and for all?

Kaitou's devious game becomes a fight for survival as Hiei, Botan, and Kuwabara all fail prey to the twisted teen's bizarre rules. But Kurama issues a challenge...one by one the letters of the alphabet will become taboo. If any of the taboo sounds are uttered, the speaker will face a terrible penalty. Placing his own soul on the line, Kurama prepares himself to battle wits with the brilliant Kaitou.

As Yusuke continues his chase of Sensui, the unbelievable Sniper confronts Yusuke. As Genkai and the rest of the team follow, can Yusuke escape Sniper's endless barrage, reach Sensui and save Kuwabara... not to mention, the entire human race?

Yusuke continues to evade Sniper's dangerous attacks, but the horrible villain may still have a few tricks up his sleeve. Meanwhile, Hiei has finally returned to his former teammates to join in their crusade, but will that be enough to free Kuwabara before Gourmet can consume his power, and tear the Kekkai Barrier to shreds?

Kurama's anger has sentenced Toguro to an eternity of suffering, forever chasing his foiled revenge. But the tunnel to Demon World is opening. Can Yusuke's team still save the human race? Only a dramatic showdown between the past and present Spirit Detectives will reveal the truth!

As Itsuki explains more about the bizarre Sensui, Koenma prepares to use his most powerful weapon: his pacifier! It can create a barrier that would stop the demons from flooding Living World. Koenma knows that Sensui must be stopped or his evil plan will come to fruition dooming the entire human race!