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?!

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?

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".

After being able to use his Dragon World deck again, Gao disobeys Count Dawn’s orders and goes to Ikazuchi’s hideout to save Noboru. Meanwhile, Ikazuchi sensed that Gao was coming and he waits there to devour him. Baku puts together a deck called ‘Super Dragon Fifth Omni Formation’ that contained the Fifth Omni Cavalry Dragons, Meglax and Doble. With the deck, Gao challenges Ikazuchi again.

Jin Magatsu is called out by a boy named 'Tiger’, and is then lost contact with. Meguri Mamakari informs Zanya about this and he reports to Count Dawn. He is then entrusted to go back-up Jin. Zanya goes to find Suzuha Amanosuzu for questioning, and she also gets a letter from Tiger. Suzuha thinks that its a love letter from Tasuku and does not listen to Zanya’s explanation. She goes to the fight’s place immediately. The one that appears in front of Suzuha is the previously kidnapped Noboru Kodou.

The Buddy Police gain new eyewitness information about an Omni Lord at Chou Hotaka. Gao is sent there and he encounters his former classmate, Kiri. Gao and Kiri were happy about their reunion, but Drum was worried about why his Omni Lord Emblem had reacted strangely. Gao stays over at Kiri’s boarding house for the night. At night, Gao wakes up and sees Kiri talking to his father. However after taking a closer look, Kiri was not talking to his father. Instead, he was talking to a shadow that was inside a mirror…

In order to seal Yamigedo, Gao and the rest start special training. Hence, Asmodai can’t train with them since he’s still resting and goes to the TV Station with Tetsuya. Meanwhile, Gao and Stella meet a band of 3 monsters that came from Magic World and take them to the TV Station. The band’s singer, Rucy says that they used to be friends with Asmodai. Rucy says that Asmodai is a “Friend betraying Good-for-nothing.” And Tetsuya is shocked beyond words.

Having had his half-body eaten by Yamigedo, Asmodai tracks Sophia and discovers the location of Yamigedo. Elsewhere, Tetsuya trusts and waits for Asmodai, who disappeared from before him. Rucy is impressed by Tetsuya’s devotion, and opens up to him at the park. But then, they discover Asmodai trying to use Space Magic to reach Yamigedo. Without care for their own danger, the two leap into the magic circle. They arrive in an alternate dimension, and are attacked by the controlled half-body of Asmodai.

When Paruko sees Jack's message, she informs Tasuku about him. They try to find ways to get to the distant future of Star Dragon World. Tasuku, in his desperate feelings, accepts Sofia's help who sends Elf Kabala to power up Takosuke's mothership for a 'Time Jump' machine. The group is transported to the top of a building in a ruined cityscape overrun by Hundred Demons. Rage Thirst Emperor, Grand Wilderness spots the group and attacks. Tasuku rushes to the defense of the others, but is knocked off the building in doing so. He awakes to see two children being accosted by Zarrtelganger, Armorknight Lion Drake, and Zazamera. Tasuku leaps in and attacks Zarrtelganger, but before Zarrtelganger can retaliate, Tasuku's Star Pulser flies in and hits the monster. Star Guardian, Jackknife erupts from the Pulser, causing the monsters to flee. Tasuku and Jack then reunite briefly.

The chaotic future that Tasuku landed on was a future where Yamigedo wasn’t sealed. Variable Cord explained to Tasuku that Jack didn’t get his maintence because Star Dragon World didn’t exist. Tasuku is overwhelmed by anger and lets it out on Variable Cord. Meanwhile, the Hundred Demons kidnap Sofia and she is put at Gratos’ hideout. After being informed about it, Tasuku heads out to save Sofia.

By Gratos’ orders, Sofia uses her Disaster Force and forcibly awakens Grangadez. Grangadez is angry because of being disturbed and starts a rampage. Kiri and Rouga try to stop it. Third Omni Water Lord, Miseria’s power managed to return Grangadez to card form, but Grangadez’s ignited appetite for battle begins to affect Kiri’s body negatively through the card. Rouga challenges Grangadez to a Buddy fight to calm its belligerence.

Gao’s mother; Suzumi has returned from America. However, Ikazuchi was following her. He tried to attack her, but he lost consciousness. When Ikazuchi woke up, he refuses Suzumi’s invitation. In the end he stayed with the Mikado family for a meal and a bath. While they were talking, Gao noticed that Ikazuchi was different from before he went missing. Before he could say anything Ikazuchi rushed out of their house. But Noboru waited outside the house for Ikazuchi.

The resurrection of Yamigedo is close at hand, and all Omni Lords are found! It is time to seal Yamigedo, but their is just one big problem. Where is Yamigedo?!

Gratos`s plan has succeeded! Yamigedo is revived along with the creation of the Inverse Omni Lords! Will Gao and the team be able to fight off their dopplegangers?

Yamigedo has landed on Earth! Gratos is gone but in his place is the mentally torn Ikazuchi who is now being controlled by Yamigedo himself! Gao must step up in order to save his new friend once and for all!!

Yamigedo has retreated in order to enact his final evolution, so it is time for Gao and the Lords to strike! However, the Inverse Fiends will not let them get by so easily?! Can Gao finally get through to his lost friends?!

Gao and the gang has been separated by Yamigedo and his Dark Core, so each one has to fight a different Inverse Fiend alone! Tasuku and Suzaku are the first targeted by Sofia, but something seems...Emotional about her?! What is Sofia`s endgame?!

Zanya and Tetsuya are stuck together as they face the next two Inverse Fiends, but Zanya's serious attitude and Tetsuya's free spirit are colliding! Will the two be able cooperate in a tag fight against their common enemy?!

Gao is still shaken up by his failure to save Ikazuchi, but he must snap out of it as he is next to face against the Inverse Fiends, but his opponent isn`t Ges Shido, it`s World Famous Wrestler Kazuchika Okada?! Can Gao snap out of his hesitation in order to face a man who is as strong as a god?!

The next battle against the Inverse Fiends are with Kiri and Rouga, tagging up against the brainwashed Tiger and Davide Yamazaki. Can this "Odd Couple" take out these wild beasts of an adversary?!

The Next fight against the Inverse Fiends has arrived, as Ban finally heads into the ring against the powerful human, Genma Todoroki. Meanwhile, deep in the depths of the cave, Mukuro Shigamine appears, but not before being Intercepted by a certain person?!

In a act of desperation, Yamigedo has turned Kemura into a horrifying monster! Kazane loses to him, but before she is turned to stone, Captain Answer is taken by Yamigedo to become his servant. Mukuro Shigamine arrives to help Kazane fight the evil duo in a 2 on 2, with the remains of the Ninth Omni Lord Emblem close to his heart! Can Kazane get through to her close friend, and can Mukuro awaken the true spirit of a Hero inside him?!

All of the Inverse Fiends are defeated, but it seems that Kyoya Gaen has appeared from behind the scenes to enact his master plan! With the assault of two powerful beasts colliding, Shido is stuck between the crossfire of his two bosses! As Shido must confront a life threatening decision, which side will he choose?!

Yamigedo has reached the ultimate of ultimate forms due to Kyoya's master plan going horribly wrong. And it seems everyone but Tasuku has been turned to stone! Tasuku must fight alone as he faces the true form of the Lord of Hundred Thunders and his Demons! Can he survive and bring out a miracle?!

The Ultimate form of Great Fiend, Yamigedo has been forged and summoned to the apocalyptic future! Ikazuchi stands with all the true Omni lords in a fight for his world, his family, and his identity?! As the beast rampages the fight with his indestructible power, can Ikazuchi awaken the powers of the Ultimate Power to turn Yamigedo into nothingness?!

Gao`s battle against Yamigedo has become almost one-sided, due to the power of Yamigedos 100-card deck, but Gao does not give up in the face of despair. With all 9 Omni Lords in his deck, The ultimate Power forged, and the lives of everyone in the Past, Present, and Future on the line, can Gao truly go Beyond the Limit?!