An enormous dragon twines around Chou-Tokyo’s Sky Tower, its name is Fifth Omni Dragon Lord, Tenbu. He says, "In order to prevent an 'unbelievable threat, I have come to Earth to search for the strongest Buddyfighter." Gao Mikado and his Buddy, Drum Bunker Dragon, challenge Tenbu to a Buddyfight. Gao has a new Impact! Drum has a new form! The tale of ‘Buddyfight 100’ starts now.

At the school Gao goes to, cases of people having their decks stolen starts to happen. As a Young Buddy Cop, Gao goes there to investigate, but he’s lead to a fighting stage in a different dimension by a dark power. A mysterious Buddyfighter named ‘Death Shidou’ has the Hundred Demon, ‘Ice Prison Emperor, Cocytus Greed’ as his Buddy. He challenges Gao to a fight.

Suddenly, Buddy Police Instructor Count Dawn comes out of a strange coffin which lands in front of Gao and his friends. Count Dawn strictly says that “A child can’t handle the duties of a Buddy Police.” Meanwhile, a Hundred Demon named ‘Twin-Headed Hellhound, Orthros’ appears at Aibo Academy. The students start to fight each other because of the smoke let out by Orthros. While thinking of a solution, Gao is suddenly interrupted by Death Shido who seems different then usual. Gao must prove himself to Count Dawn in order to gain his trust.

A classmate of Gao’s, Souwa Tatsuto, manages to draw the card of Crimson Warrior Drum Bunker Dragon...

Gao has no time to rest as a Buddy Police apprentice. After his duties, regardless of the fact that it was a Buddyfight lesson Gao liked a lot, he immediately fell asleep. Tetsuya Kurodake is worried about the fact that he can’t do anything to help Gao. Meanwhile, a case occurs where all the food in restaurants and convenience stores disappear. The criminal that did it is a Hundred Demon named "Rage Thirst Emperor, Grand Wilderness" Gao goes to the scene yet again, but due to their fatigue reaching the max, Gao and Drum fell to the ground at the scene.

Zanya’s little brother, Akatsuki wanted his older brother to become a Buddy Cop, and asks Gao about it. But, Zanya arrives and scolds Akatsuki: "You’re shameless." Akatsuki cried. While Akatsuki struggled to apologize, a Hundred Demon named Brainbaltes and its siblings violently follows him. Zanya stares at the Hundred Demons, and prepares his core gadget.

Emergency Buddy Police News appeared and they send Gao. Gao wondered what kind of strong monster will he face this time, and continues to fly. But, when he arrives, the one that was there… seemed to be a cat. Gao thinks that "For now I should quickly capture it", the cat introduces itself as "I’m Cait Sith in Boots!" and challenges Gao to a fight. It looks cute but… is it really strong?

In order to steal Tenbu, Ikazuchi sends out a new Hundred Demon named Dekalfar Demon Swordsman, Heim. Heim takes Baku and Kuguru as hostage, and demands for Gao to hand him Tenbu in exchange. While Gao was thinking about what to do, Tenbu changes into his card form and goes into Heim’s hand himself. Having gotten Tenbu, Heim escapes. Baku and Kuguru are manipulated by the Hundred Demons and attack Gao.

Gao and Drum chase the Hundred Demon that snatched Tenbu, "Dekalfar Demon Swordsman, Heim" into Dragon World. While at Dragon World, they come across the fight between Tasuku and Purgatory Knight. After Tasuku defeats Purgatory Knight, Gao told him everything that was happening on earth. Including Gao becoming a Buddy Police Trainee and the Hundred Demons too. The two feel down as they think that they can’t become who they aim to be. "Instead of becoming someone else, become a stronger version of yourself." Jack says. Thanks to Jack’s words, Tasuku stands up, full of excitement.

First Omni Beast Lord, Ziun awakens from his ten thousand year slumber. He says that he’s looking for his friends that have gotten lost during his slumber. Ikazuchi decides to use Ziun and commands Shidou to get Tenbu from Gao with him. Meanwhile, Gao slept late due to the extra lessons, and goes to the Academy with Tetsuya. Death Shidou waits for Gao there, but Zanya arrives and Ziun mistakes that Zanya was Gao. Ziun challenges Zanya to a fight.

Ban Enma calls himself the "Hundred Demons Hunter". If it's to hunt Hundred Demons, he doesn't choose other plans. The Buddy Police mark him as soon as they hear that, and they also urge Gao to be more careful. Meanwhile, Shido gives Ban the Hundred Demon and they discuss about the plan to steal Tenbu. But the plan sadly failed. Ban takes the Hundred Demons card away. Ban goes to a deserted storehouse and smiles as he views the Hundred Demon card. Just what is his goal?

The Suzuha Amanosuzu Organization is going to hold a party on Sunday. Baku and Kuguru are excited about it, but Gao says that he has Buddy Police work throughout the day. "We don’t even have free time to eat Takoyaki…" Both Drum and Gao complain. Suddenly, the splitting image of Suzuha’s robots appear in front of them and they head to the Castle to see Suzuha. "Surely Suzuha appeared…" They thought. But they see a Hundred Demon possessing her. The shadow of Mysterious Dekarabia is floating near her. Gao and Drum fall into a Dungeon Stage and are forced to fight 1024 fights.

Finding himself nearly falling unconscious from fatigue, Gao struggles in his Fight against Death Shido. But, he senses Tasuku, gets back his willpower and wins spectacularly. Fed up with Death Shido, Ikazuchi decides to make a move himself, and attacks Gao, saying "I'll go eat Tenbu!". However, Asmodai stands in the way. A mysterious flag, and Ikazuchi, controller of the Parade of Hundred Demons card. Asmodai turning up without Tetsuya. What sort of Fight is about to unfold?!

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The underground organization known as "Buddyfight Club" holds a ceremony with illegal buddy fights. The Buddy Police hears the rumor of their sponsor being an Omni Lord. Tasuku is immediately ordered to head to Chou Nagoya, where the ceremony is held. After some time of investigating, Tasuku stumbles upon Sofia and a mysterious boy doing business. Suddenly, Rouga Aragami appears. He activates his Disaster Force and attacks the mysterious boy. Tasuku tries to control the situation, but the mysterious boy gives both Tasuku and Rouga the Buddyfight Club’s invitation and disappears. Tasuku witnesses a shocking spectacle…!

A brawling incident happened with two mysterious people. One wore a conical hat and the other had a black felt hat. After the Buddy Police’s investigation, they reported that the person with the felt hat had 2 horns. Since Gao was still on break, Tetsuya and Asmodai go investigate. While on the way, they meet Zakoyama and his friends attacking people. And the two mysterious people appeared as usual. Tetsuya wanted to confirm the person was an Omni Lord, but the guy in the conical hat said that the Second Omni Lord was Asmodai. He presses them with evidence.

Zanya finally finds the First Omni Beast Lord, Ziun and asks him to join his deck. However, “You still do not understand the true power of Katana World.” Ziun declares after Zanya loses to him countless times. He then leaves Zanya. Zanya suffers. He then suddenly meets Jin Megatsu who gives him advice and also entrusts him with a card. Zanya raises his head after Jin’s advice and finds Ziun again. Ziun accepts Zanya’s challenge once again after seeing his determination.

Gao’s health is becoming worse as he still refuses the despair and fear thanks to being beaten by Ikazuchi and losing Tenbu. “First of all, you need to admit it.” Count Dawn tells Gao. But actually, Count Dawn still did not move on from his bitter past. After being told of Count Dawn’s past, Gao heads with Dawn to move on together. He fights with Kazane Fujimiya. What’s Dawn’s connection to Kazane and why has he hidden his sad past?

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Noboru Kodo has returned from America. In order to cheer up Gao, Noboru gives him a written challenge. Gao was happy about Noboru being back, but he still couldn’t use his Dragon World deck. Suddenly out of nowhere, Sofia and Ikazuchi appear. Ikazuchi attacks Gao, but, Noboru calmly steps between the two.

Noboru is kidnapped by "First Knight of the Apocalypse, Gratos". The Buddy Police chase after him. Meanwhile, Mukuro Shigamine suddenly appears in front of Ban. He tells Ban to hand the Omni Lord’s Crest over. "I don’t know what that is." Ban says, but his buddy Rikki’s body glows as it reacted to the Omni Lord’s Crest. While Tasuku and Zanya didn’t think much of it, Shigamine tries to kidnap Rikki. But, Gao rushes to the scene.

To make sure that Ricky was an Omni Lord, Drum searches for Ban and Ricky. When Drum finds Ricky and asks for the truth, Ricky looked like he was hiding something. When Gratos appears, he didn’t go for Ricky, he went for Ban. The moment Ban sees Gratos, he begins to act violently. Ricky decides what to do and he approaches Ban with the Omni Lord’s Crest in hand. After that, the Omni Lord’s Crest flashes, and Fourth Omni Fire Lord, Burn Nova appears there.

Gao tells everyone that he won’t Buddyfight anymore. While all his friends were dumbfounded, Drum told Tasuku something before leaving. Without Drum, countless boring days passed. One day, Tatsuto Souwa asks Gao to look through his deck. “I’m starting to love Buddyfight even more.” Tatsuto says with bright eyes. When Gao saw those eyes, he’s overflowed with a feeling he had forgotten. After noticing, he picked a Dragon World card up and started to build a deck. Tasuku was visiting, and he hands over Gao’s deck "Crimson Dragon Fist".