Gao's class is going to a field trip to the photon metal mines, but the trip is cancelled due to "Wolf" attacking the mines to steal Photon metal, however they don't realize the trip until they arrive.

Assuming his identity as the top Buddyfighter in 8th grade at Aibo Academy, Rouga challenges Gao to a Buddyfight, but Gao refuses. Rouga slips on a banana peel set up by Tetsuya and Asmodai , which prompts him to challenge Tetsuya, which Asmodai accepts (without Tetsuya's consent). During lunch break, while Rouga and Tetsuya battle, Gao is reminded about a time when he also believed that winning was everything like Rouga. When Gao's hunger for winning led to him injuring someone during a martial arts match, he realized that mentality is wrong. Gao has since then changed in order to make more friends.

Gao Mikado, wants to participate in the ABC Buddy Cup, but he needs to find a team first. Meanwhile, Noboru Kodo meets a mysterious old man.

To conquer Gao Mikado's weakness, both Baku Omori and Kuguru Uki suggest him to construct a new deck. However, Gao disagrees with the idea. At the same time, Jin Magatsu from the middle school stole Gao's deck!

Noboru goes to the Buddy Police headquarters to void his contract with El Quixote and be done with Buddyfighting. Suddenly, the alarm sounds due to the appearance of the criminal Akaoni Kanme, prompting Tasuku and Takihara to apprehend him. Noboru is invited by Commander I into the Buddy Police's main room where he not only watches Tasuku defeat and arrest Akaoni, but he also learns about Tasuku's past. Noboru then runs off, frustrated at himself for not being special like Tasuku or Gao. Nonetheless, he gets encouragement from El Quixote who tells him to do what he wants to do, regardless of what others may say.

One of the grade 7 students, Suzuha Amanosuzu and her buddy, Center of the World, Mary Sue. It is said no miracle shall happened before her.

Round 2 of the ABC Cup, it's the buddyfight between Zanya Kisaragi and the team Discipline Committee but the buddyfighter has gone missing.

The next quarterfinal match of the ABC Cup will be Noboru versus Shido. Before the match begins, Noboru meets with Shido in the student council room, where it is revealed that Noboru had unwittingly been bribed by Shido to lose to him during the previous ABC Cup. However, he decides to not take his bribe this time but still intends to throw the match. With helpful advice from El Quixote, Noboru resolves himself to not only have a fair fight against Shido but also reconstruct his deck to include a certain card.

Gao and his friends are informed by Noboru's parents that they and Noboru will leave the country soon. Then, the first semifinal match of the ABC Cup commences with Gao facing Noboru. While fighting, in addition to recalling their pasts, Gao is infuriated that Noboru did not tell anyone about his departure, while Noboru expresses his frustration over how Gao always seems to be in the spotlight. Despite Noboru following advice from the teammates (Maihama and Niitani) he ignored, Gao emerges victorious. Afterwards, at an airport, Gao and his friends bid farewell to Noboru, who sheds tears and subsequently leaves Japan.

Intending to have Genma inherit the Dark Core (which was formerly in Rouga's possession), Sophia uses the Dark Core on Doai. She puts Doai under her control and has him attack Genma to coerce him into using the Core. Meanwhile, Gao, his friends, and family members are having a dinner party when Akatsuki drops in. Zanya arrives to retrieve him while also telling Gao that he does not see him as a rival.

Genma and Magoroku have their Buddyfight with both of them using Ancient World decks. As the fight goes on, Genma expresses his disgust at how Magoroku is acting as student council president. He also shares his ideals of how the president should be like the "sun", which intrigues Gao. Genma eventually uses his powerful buddy monster Martial Arts Dragon Emperor, Duel Sieger to defeat Magoroku.

Gao and his friends gather in his home where they recap and discuss the events of the ABC Cup. Meanwhile, the Buddy Police is taken over by Sueroku, who is Magoroku Shido's father and also a special detective. Because of Tasuku's unauthorized usage of Future Force, Sueroku forbids him from using Buddyfight cards for one month. Elsewhere, Sophia has a meeting with her master, Kyoya Gaen. Later, after Gao's family visits Yota's grave, Suzumi tells Gao that she has taken a job to teach martial arts in North America. Although initially shocked, Gao and the rest become supportive of Suzumi's decision.

Gao, Tasuku, and the other participants of the ABC Cup are invited on a cruise ship party hosted by Kyoya Gaen, who is working with Sophia to look for a candidate Buddyfighter to use the Dark Core and Disaster Force. Later, Kyoya tries to present a special rare card to be given to a Buddyfighter of his choosing, but it goes missing. Although it seemed as if the card was stolen, it turns out that the card was in fact the monster Dragowizard, Qinus Axia who had gone off on his own because he did not want to be given away.

Gao and Kazane engage in a Buddyfight, in which Kazane exhibits more of the fun gambling style of her Dungeon World deck. With Drum returning to Gao's side to aid him in battle, Gao defeats Kazane, and the two fighters become friends. Elsewhere, Kiri is feeling pessimistic about his Buddyfighting skills when Rouga suddenly appears and takes him away. Having witnessed this scene, Paruko Nanana informs Gao and the rest about Kiri's abduction. They later learn that Kiri has been taken to Sengoku Academy...

Kazane volunteers to face Kemura in the next match. Although Kemura initially does not play well after what happened in his fight with Genma, Rouga snaps him out of it and the two fighters continue to play at their best. It is revealed that Raremaro was the one who put the hate card in Kemura's deck. Kazane defeats Kemura, who then tells off Raremaro and leaves to reconcile with Genma. For the next match, Zanya decides to step up.

Zanya's opponent is the second of the Demon Generals, Kanahebi, who comes from a notorious ninja clan that had almost all of its members arrested by the police, the commissioner of which was Zanya's father. While claiming to have abandoned his dream of reviving his ninja clan, Kanahebi halts Zanya's assault while slowly whittling Zanya's life points away. However, Zanya manages to overcome Kanahebi's stall tactics and wins the fight while also convincing Kanahebi to continue pursuing his dream.

Gao and Drum leave to buy rice for everyone. On the way home, they witness Sofia who was moving suspiciously. Gao felt surprised at the previous scene, and was driven to a pinch by Sofia’s dark powers. Drum was very panicked, but Gao did not want to give in. The method to get them out of the situation, surely exist between the two.

One of the demon generals, Shosetsu Kirisame VS Gao Mikado. In the middle of the fight, Shosetsu takes in the power that he wanted too much, the Dark Core’s dark power. The Buddy Police catches the response, and Ryuuenji Tasuku that had once guessed the threat of Wolf, is hurriedly dispatched towards Sengoku Academy. Shosetsu begins to act violently with the card’s powers being real. The helpless Gao and his friends, wonder where this match is going…

Rouga Aragami VS Gao Mikado. It’s finally the general’s showdown. Gao faces Rouga, the guy that he wanted to befriend, Gao says with a smile, “I want to be friends with you, Rouga-senpai!”. His opponent is Rouga, but Gao had prepared a deck for his secret plan… Now, it’s finally, Brave Drum’s turn.

Gao and his friends peacefully go back to the Mikado Residence with Kiri. Kiri had grown a bit stronger since the experience at Sengoku Academy, and he immediately wants to test that power by challenging Gao to a Buddyfight. Meanwhile, Kyouya Gaen continues with his questionable behavior, and starts to assemble as a member with Shidou and Sofia. They carry the power that is waiting to change the world, it’s name is ‘Disaster,' and it’s finally making it’s move.

Criminal Buddy Fighter, Majin Inzaidi escapes from prison. Buddy Police Tsurugi Takihara, fights against Inzaidi using Hero World’s power. However, when Buddy Police Stella is taken as hostage, a man that is going to answer with justice, Captain Answer makes an appearance.

Aibou Academy gets a new teacher named ‘Elf Kabala’, and he has a keen interest about Buddyfight. He makes an arrangement with Headmaster Iron Claw Ikarino, he brings the classmate with him to a secret fighting stage. As long as Ikarino does not win the Buddyfight, Ikarino will not be able to get out of the fighting stage. ‘Demon Lord, Gagnar’, Ikarino’s buddy accompanies him, as he fights with a Dungeon deck.

A member of ‘Disaster’, Terumi Kuchinawa. The girl is a pupil at Aibou Academy, she was requested by Kyouya to get in contact with Gao. But Gao’s friend, Tetsuya Kurodake sings and dances and comes to stop her plans for some reason. The angered Terumi wants to formally remove Tetsuya, and puts the power of darkness, Disaster Force to use.

The buddy fighter that steadily grew, Kiri. Kiri that wants to use Legend World and skillfully constructs a deck, he wants to test the power of the deck, so he heads for the Castle. Kiri gets a phone call. The excited Kiri, readies himself to request to have a match with Kazane. Just what is Kiri’s true motive that he in such a hurry for…?

Kiri suddenly receives a letter, and energetically knows it's Gao. He hurriedly goes to that area after school, and then the thing that is awaiting him, suddenly changes the whole atmosphere.

While inside Aibou Academy, Kemura invites Todoroki Genma. And the thing that was awaiting them, was really a member of Disaster, Magoroku Shidou. Shidou uses the not yet known world, ‘Darkness Dragon World’, he fearlessly laughs at the previously wounded Duel Sieger. That conclusion of surplus is…

Disaster’s Yamazaki David is, a dependent person that isn’t timid to display all of the trickery he commited. He arrives at the Buddy Festival that’s risen at Castle, and instigates a match with Gao. David uses his hand of cowardice once more, and Gao’s anger lets him to bring out his hammer.

Kyoya Gaen puts a mysterious card in Tasuku's deck. Tasuku fights against Davide and Shido. It turns out that the card is a special rare with a forbidden power. Mean while Gao and the Grim Reaper are having a battle. Will Gao get through to Kiri and will Tasuku win? It's buddyfighting like you've never seen it.

Elf Kabala VS Gao Mikado . Kabala is not a scientist that can use the Dark Core’s power to manipulate monsters. Kabala does not uses the monsters that the God of Death (Grim Reaper) had stolen, and Zanya’s Buddy, Tsukikage appears in front of Gao not beside Kabala. Baku gives Gao the deck he newly made, “Exploding Dragon Fang”, to not take back the stolen Tsukikage!

Kyoya Gaen sponsored, and chose the 8 best teams to Buddyfight in it, the “Gaen Cup” was announced after a meeting. Gao Mikado was invited, but he hesitates to partipate due to being worried about the dangers of Disaster, because of that, his friends gather to fight alongisde him. But, Zanya Kisaragi strictly informs that Tetsuya Kurodake's deck's strength is not enough.”…

The thing that the whole world was expectantly waiting, the curtains of the festival of the century, the “Gaen Cup” finally opens. The Gaen Cup uses the Fighting Stage at Aibou Academy and reconstructed it, the 8 teams, the 24 fighters gathered there. The passionate area’s climax is started with Team Goddess, Amanosuzu Suzuha’s team. Bal Soleil tightens their guard, but how will Kisaragi Zanya fight against a female!?

The second match of the Gaen Cup has begun as the fighters are Team Goddesses mysterious fighter, Terumi Kuchinawa versus Balle du Soleil`s Tetsuya Kurodake. Terumi must prove herself to be strong or else she will be turned back into a nobody before anyone knew her, but Tetsuya has a plan to set Terumi free of her shackles as he confesses his love for her throughout the fight. Will love prevail or will Terumi`s identity stop even the Power of Love?!

Team Balle du Soleil reaches their final match against Team Goddess in the Gaen Cup, and they have a surprising fighter who knows all of Gao's strategies, and even the cards in his deck! How will he win this one?

The next matchup in the Gaen Cup begins, and it's Team Sengoku vs. Team Purgatory. A surprise in their lineup makes Rouga angry at Kyoya!

Team Sefukai vs Team Destiny. Noboru returns from the United States with his evolved Dragon Knight deck. However, Gemma also has improved through training.

Team Balle du Soleil safely survived the first round of the Gaen Cup, and celebrated at the Mikado Residence. A sudden visitor appeared there, and that visitor was Drum’s father. Gao’s father, unexpectedly becomes Father Drum’s Buddy, and started to help Gao and Drum to strengthen their bond. The fathers’ thoughts that they want to convey to their sons is…

The first match of the Gaen Cup Semifinals is between Team Destiny’s Noboru Kodo and Team Purgatory’s Purgatory Knight. Purgatory Knight stands with his Buddy, Demios Sword Dragon, Leader of the Purgatory Knights and cruelly fights Noboru. But Zanya manages to see the face of the person inside the armor. Finally, Purgatory Knight reveals his true colors…

Team Destiny’s and Team Purgatory’s next match is between Jin Magatsu and Rouga Aragami. They clash into each other with different feelings for different friends. Meanwhile, the Pugatory Knight Tasuku confronts with Gao, and Tasuku’s natural intention in Disaster shocks Gao.

The Gaen Cup’s second Semifinal. Team Balle du Soleil VS Team Darkness Masterminds. Now knowing Pugatory Knight Tasuku’s true intentions, Gao and Zanya were heavily disturbed. In order to change the heavy atmosphere in Team Balle du Soleil, Tetsuya Kurodake takes the first match. Even now Tetsuya loudly sings and dances, and finally his message reaches to his friends.

Gremlin’s big match, as he is Disaster’s deck builder and Baku’s teacher. “The fighter is a Deck Builder’s addition.” Gremlin declares, as his deck also made Baku astonished. Which deck builder’s belief will win? Death Talika’s wall must be smashed down!

While the world is heated up by the Gaen Cup, Takihara, Stella and Commander I make their move in order to restore right to the Buddy Police. But they are stopped by Nobari and Sueroku and Magoroku Shido. As they were cornered on the rooftop of Buddy Police HQ by Magoroku with his Disaster Force active, as though all hope was lost, the hero of justice, Captain Answer appears!?

The Gaen Cup’s final, Team Balle Du Soliel VS Team Purgatory. Tetsuya’s opponent, Sofia met him before their match to discuss something. She was the one that took Kuchinawa Terumi’s memories, and told Tetsuya that if he forfeited the match, she would give Terumi’s memories back. While Tetsuya was deeply troubled by this, Sofia shows off her real moves as a Buddyfighter.

The next match of the Gaen Cup is between Kisaragi Zanya and Aragami Rouga. Zanya was for Tasuku’s sake, Rouga was for Kyoya’s sake, both of them had a lot of things to tell their respective other’s. Their trusted justice clashes in this match. Just what was the things they wanted to convey to their friends? After their friends knew, the moves they made were…

The Gaen Cup’s final big match, Gao Mikado VS Tasuku Ryuenji. Gao’s first opponent was Tasuku and this was their fated rematch. Gao the Sun Banchou and Tasuku, whose eyes were not awoken fought with all their strength. Meanwhile, Takihara and the rest at the Buddy Police, in order to stop Kyouya’s plans, advance towards Kabala’s laboratory.

Kyoya Gaen’s plan activates during the final match of the Gaen Cup. A giant monster is seen in Darkness Dragon World’s Gate that appeared in the sky above the Fighting Stage. The crowd became noisy and at that moment, Tasuku and Gao… Finally Kyoya’s ambitions are made clear. What did the Dark Core’s power invite to the world?

The Gaen Cup’s final big match, Gao Mikado VS Tasuku Ryuenji. Gao’s first opponent was Tasuku and this was their fated rematch. Gao the Sun Banchou and Tasuku, whose eyes were not awoken fought with all their strength. Meanwhile, Takihara and the rest at the Buddy Police, in order to stop Kyouya’s plans, advance towards Kabala’s laboratory.

The match that decides the world’s fate finally starts. Kyoya uses a special flag, “Dragon Ein”, and reveals Demonic Dragon of Demise, Azi Dahaka’s full form. How will Gao fight against the formidable enemy without seeing it before? And again, while the fight was going on, Tasuku and Kiri enter Kyoya’s hideout, intending to prevent Kyoya’s plot from advancing.

The world is excited about Kyoya’s overwhelming power, and the Dark Core gained strength. If Gao lost to Kyoya now, the Darkness Dragon World’s gate would fully open, and the world would come to an end. Gao is heavily cornered, but does he still believe in the future? He opens the path to the future with his Buddy. "Break out your future card!!"