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?

After much convincing, Hiei joins Kuwabara's crusade to save his kidnapped comrade. Upon reaching the mysterious Rokurokubi Estates, the three discover Kaitou, who quickly explains the rules of his territory. Can Kuwabara, Kurama, and Hiei be of any use in a place where any form of violence is strictly prohibited.

As Sensui's plan continues, Kuwabara and his friends attend a rock concert. However, they are ambushed by Sensui's next minion: Seaman, a person with the ability to create monsters out of water. With his friends held hostage, Kuwabara must battle Seaman alone...

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?

Yusuke's team has won the first round, but they'll need to win three more to defeat the Game Master and move on to Sensui's lair. The hole to the Demon World is rapidly expanding. Can they make it there in time to prevent the end of the world?

As the tournament to decide the king of Demon World wraps up it's preliminary round, one match continues to wage on. A father and son were pitted against each other in the random drawing. Now the vigor of youth has to beat out the patience of age. Which one will come out on top? Who will finally advance to the main tournament?

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.

When he’s ambushed by a loose-cannon competitor, Yusuke learns that even quiet moments on Hanging-Neck Island are dangerous. Meanwhile, Hiei faces the consequences of his deadly dragon attack.

Despite his stunning victory at the Dark Tournament, Yusuke Urameshi learns firsthand that there are others wishing to challenge him. Yusuke makes the first mistake by underestimating the strengths of these new adversaries. With his best friend kidnapped, Kuwabara must round up the old gang in order to stage a rescue attempt...or suffer the consequences!

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 and team return topside to the waiting arms of their friends. But all is not well. King Yama's soldiers arrive saying that they must destroy Yusuke once and for all. Could this be the end? How much energy does the Spirit Detective have after his exhausting battle with Sensui?

As the main bouts of the Demon World tournament get underway, some of the best and most familiar fighters are removed rather quickly. While it looks like some of the fighters' motivations for entering aren't exactly what they seemed, they all have their eyes on one warrior as the prize--Yusuke.

Kurama faces down Shigure in the ring! But Kurama has to deal with the demons of his past: namely his choice to remain in the Human World. With the boiling up of tempers and anxieties comes the resurgence of Yoko Kurama! But will Kurama find a way to keep his anger from taking over?

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.

The doctor’s human experiments are clearly fighting against their will! As Yusuke prepares to put them out of their misery, the Masked Fighter intervenes and suggests a peculiar plan.

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.

This episode starts with Jin in the air with his Double Tornado Fist ready for the kill. All of a sudden Yusuke says, ""Time for something stupid."" His body becomes surrounded with spirit energy. Everyone is surprised-Botan, Kuwabara, Kayko, Koenma. Then Jin attacks with the first tornado fist. Yusuke somehow catches the fist. Jin exclaims, ""No one can catch a tornado!"" Yusuke throws the fist, rendering it useless. When Jin attacks with the second fist, Yusuke catches it with his foot. He also makes the Tornado Fist useless. He yells, ""SPIRIT WAVE"" and a punch full of blue energy nails Jin right in the stomach. Jin goes flying in the air. The Masked Fighter explains that the Spirit Wave is like Yusuke's shotgun attack and that he must have learned it from Genkai. In the stands, Kayko is shocked, but Shizuru says, ""Let's move."" All of a sudden, a sparkle is seen in the sky and Jin's body comes crashing down in the stands. Koto makes a ten count, and Yusuke is the winner.

Yusuke is still in the midst of Genkai's Spirit Wave Orb absorbtion test. After a while, Genkai realizes that this is too much for Yusuke. She tries to take the orb back, but Yusuke takes it back. He wants to finish the test. Back in the ring, Shishiwakamuru rolls the dice. It lands on Kuro Momotaro and a free space for team Urameshi. Hiei volunteers to fight. Both fighters step in, and Kuro asks for Hiei's katana. Kuro licks the blade and cuts himself with it. The fight begins. Kuro pulls something called a steaming sphere out of his belt and squeezes it. Kuro inhales the fumes from the sphere and hair starts to grow from his body. This is the first beast armor, the Armor of the Ape. Hiei tries to attack with his sword, but it breaks in three pieces. Kuro gives him a few punchs and sends him into the wall. Kuro explains once his body is hit with an attack it memorizes the pain and steaming spheres are a catalyst to make his body immune to the attack.

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?

Kuwabara and the gang finally reach the room where Yusuke is being held captive. But Kido has one final game to play with the Spirit Detective. One of his friends is in fact an imposter, and Yusuke has only minutes to determine which one it is! With his decision made, Yusuke attacks!

Kuwabara's battle with Seaman continues.

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?

Only two hours remain before the tunnel opens unleashing a horde of hungry demons upon the world of the living. Kurama steps forth to battle Gamemaster for the right to move on to Sensui's lair and Yusuke senses that one of them will not make it out alive.

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!