Approximately four years ago, a gate to another world opened in Mikado City, and invaders called Neighbors appeared.

Border sees the Neighbor Yuma as an enemy… but Osamu is unable to view him as someone with hostile intentions, and trust begins to bloom between the two boys. Osamu finds himself caught between his own thoughts and the rules of the organization he belongs to, Border.

Combat-use Trion Soldiers attack when a gate opens in Osamu’s school just outside of the Forbidden Zone. Worried he’s not strong enough, Yuma tries to stop Osamu from fighting back, but Osamu’s determination to save the other students is limitless.

Osamu gets more trouble than credit when he claims to have defeated Trion Soldier Marmod. Really, he’s covering for the Neighbor, Yuma. Kitora, an A-rank Border Agent, is furious with Osamu for stepping out of line… But does she suspect the truth?

Kitora boldly jumps onto the back of Ilgar, a new type of Trion Soldier, while it’s mid-flight and bent on attacking the city below. Suddenly, Ilgar transforms, enters self-destruct mode and plummets toward its target. How will she escape now?!

Yuichi and Osamu's critical mission to investigate the abnormal gate puts a lot of pressure on Osamu. Meanwhile, Yuma follows Replica’s advice and conducts an investigation of his own. The next morning, Osamu and Yuichi have a fateful meeting with Yuma...

Osamu reaches out to Yuma and Replica. He and Chika learn some critical information about Neighbors from Yuma, but they're soon discovered by two A-Rank agents, Shuji and Yosuke; they're searching for a Neighbor in human form...

A-rank agents Shuji Miwa and Yosuke Yoneya make an assault on Yuma without even asking what happened. Osamu calls Jin to help.

With Shuji's squad singlehandedly defeated, the Border Agency's executives order Yuichi to defeat Yuma and recover the Black Trigger. Osamu worries about Yuichi's impending clash, while a secret hidden by Yuma is slowly exposed.

Jin encourages Yuma to join the Tamakoma branch. Yuma accepts it if he can team up with Osamu and Chika.

Osamu hears from Replica about why Yuma came to this world, and from Chika about her true feelings.

Osamu, Yuma and Chika decide to join Tamakoma branch to go to Neighbor world as A-rank agents of the expedition force. They go into rigorous training from Tamakoma First Unit in order to become A-rank agents.

Commander Kido fears that Tamakoma branch will become too powerful. He orders A-rank agents who belong to the headquarters to take Yuma's black trigger.

The battle between the A-Rank attack unit and Yuichi Jin begins to rage. In the face of top-level agents, Yuichi tries to turn it into a test of endurance. But just as Shiro Kikuchihara gets by him, Yuichi's Black Trigger goes off!

Yuichi finally reveals his "Wind Blade" technique with the Black Trigger. As his battle with A-Rank vets Kei and Soya reaches its climax, the Arashiyama Unit shows up in support and clashes with the Miwa Unit. Who will emerge victorious?!

Yuichi Jin and the Arashiyama Unit repel the enemy. Receiving news of their elite squad's defeat, the Border Agency's headquarters starts to get nervous.

The day of Yuma and Chika's initiation into the Border Agency arrives. Osamu nervously stands by in support, while they draw the scrutiny of their new peers. At that time,

Osamu readies for his practice fight against Soya Kazama. Soya is a symbol of overwhelming strength, while Osamu has yet to land a hit in over twenty battles!

Osamu doesn't know how to deal with his new reputation as "the guy who tied with Soya Kazama". He is soon challenged by one of his fellow agents to a Rank War.

Yuma and Shun Midorikawa's fight begins. Yuma quietly rages over Shun's humiliating public defeat of Osamu. How will he fight against the A-rank vet? Meanwhile, Commander Kido convenes a meeting to prepare for the forecast massive Neighbor invasion.

The Border brass puts together a strategy based on Replica's information about Neighborhood. Meanwhile, Yuichi Jin senses impending danger for Osamu and asks Shuji Miwa for help. A massive battle with the Neighbors is about to begin in Mikado City!

The Neighbors' large-scale invasion finally begins. The invading army of Trion soldierrs is countered with a defense strategy. Just as the battle seems to turn in Border's favor, a new Trion soldier, Rabbit, emerges from a defeated Bamster!

Border seeks a way to counter the new Trion soldier, Rabbit. Yuma prevents Trion soldiers from infiltrating the city, but is mistaken for the enemy and attacked by the B-rank Chano Unit. Meanwhile, an Ilgar Trion Soldier menaces Border headquarters!

Trion soldiers from Aftokrator appear all over Mikado City. Border is forced to divide its forces to deal with their numbers. Chika's C-rank unit is attacked while organizing the civilian evacuation. What is Aftokrator's true goal?

The C-rank units are revealed to be the true target. The battle intensifies as Hyrein sends humanoid Neighbors Enedora and Ranbanein into combat. Osamu fights to give the C-ranks a chance to escape, but Rabbit's merciless attack on Chika continues!

Aftkrator have ordered Galopoula to make Border stuck, so Galopoula's Expeditionary Force tries to break into Border HQ to destroy the ship for the expedition. Hyuse goes to meet them secretly in order to go back to his homeland.

Inside the Border HQ, the battles begin: Gatlin and Ratarikov v. 4 strong attackers near the dock, Wen So v. Nasu and Kumagai in a hall. Outside the HQ, the teams struggle with some drones that move like humans. Meanwhile, Jin is surprised that Yotaro follows Hyuse with Raijinmaru.

Border and Galopoula's Expeditionary Force play mind games reading each other's thoughts while fighting. Reghindetz is frustrated that his diversionary plan is not working.

Border fights off the enemy one by one, but Gatlin and Ratarikov have no intention of giving up on completing their mission. Hyuse talks to Reghindetz, and Yotaro finally catches up with him.

About the time Jin brought Hyuse into Border HQ, Tamakoma Second started the match against Katori Unit and Kakizaki Unit. Osamu and Chika support Yuma with their new techniques, and try to create momentum.

Chika starts destroying buildings outside the area where Osamu has set the trap. When Yuma puts Kakizaki Unit in a corner, Kakizaki remembers his past and tries to fight back against Yuma with strong will.

Fumika Teruya prioritizes getting to Chika. Yoko Katori recalls the day her and Hana's fate changed as she fights against Osamu.

The match was over. A party is held at the Tamakoma branch to celebrate their victory, and then Hyuse offers himself to join their team as the second attacker until he arrives in Aftkrator. Tamakoma Second accepts his proposal and Osamu begins negotiation with the higher-ups of Border.

Osamu negotiates with higher-ups to get permission to include Hyuse in his team. Instead of allowing it, Commander Kido tells them that he is going to let Chika join the expedition force, regardless of their rank in the rank battles.

Tamakoma Second fights in a match against Oji Unit and Ikoma Unit. They have only three matches left, and need to be in the top two. Meanwhile, Hyuse attends the Border enlistment ceremony.

Yuma attacks Oji Unit. Besides, Ikoma and Mizukami catch up with them and Ikoma uses his special technique to strike them a hard blow. At a disadvantage, what are Oji unit's next tactics?

Yuma, Oji and Ikoma fight each other fiercely while the battle between the snipers comes to an end. Later, Hyuse shows Border agents that he is highly skilled in the use of sword to be considered a rookie.

With Hyuse joining as a member, Mikumo Squad makes a fresh start as a new Tamakoma-2. Before the Rank Wars match, Tamakoma Branch's senior members, Michael Kronin and Yuri Rindo return to the branch. Yuri Rindo reveals the unknown past of the Tamakoma Branch.

During the dinner at Okonomiyaki Kageura, Yuma is told Yuzuru Ema's real thought that he is going to give up on victory in B-Rank Wars Round 7 because he cares for Chika. Meanwhile, at Tamakoma Branch, Osamu is feeling something uneasy deep in his heart just before the Rank Wars.

The stage that Suzumaki Daiichi chose in the B class rank battle, ROUND7 was "Urban Area D". The battle was expected to be fought in the shopping mall in the centre of the map, and each team hurried to take countermeasures. Knowing that the wire line would not work effectively, Osamu decided to take advantage of Hughes, who had just joined the team and was not known to the other teams. With time, all the troops start to transfer. Yuuma and Hughes are the first to arrive, and Shu is on his way to join them. The battle begins with a clash between Murakami of the Suzumari First and Kitazoe of the Kageura Corps, followed by a fierce indoor battle as Kageura, the captain of the Kageura Corps, and Raima, the captain of the Suzumari First, join forces!

Suzunaru Daiichi Murakami holding a black arc moon and Kageura attacking with a scorpion that can be transformed. With the support of the gunner Kitazoe, Suzunaru Daiichi seemed to be on the other side of the battle due to the continuous attack of Kageura Corps, but Kageura Corps retreated to Suzunaru Daiichi's new tactics! ?? On the other hand, the sniper of the votive tablet of the Kageura corps was added to Osamu who was pressed by Okuji and Koarai of the eastern corps. However, suddenly the shopping mall goes out of power and Osamu loses his right arm due to the sniper of the votive tablet. In the offense and defense in the darkness of Kageura Corps and Suzunaru Daiichi, Murakami's invisible slash attacks Kageura. Each unit has a strange plan using the lighting mechanism of Suzunari Daiichi! ?? And Yuma and Hughes finally start to move in Tamaki No. 2!

Yuma and Hyuse fight together and make Kageura bail out, but the point goes to Suzunari-1, who dealt the most damage. Nevertheless, the two ride the momentum and take the fight to Suzunari-1! How will Tamakoma-2 counter Suzunari-1's new formation that has cornered Kageura Squad?

B-Rank Wars Round 7 finally comes to its final phase! Being gradually surrounded by Tamakoma-2 who got an advantage in numbers, Azuma Squad decides to withdraw. Tamakoma-2 struggles to score to join the Away mission. Can they pull off a victory?

Tamakoma-2's result for B-Rank Wars Round 7 exceeded Osamu's expectation, but the bad feeling he had from before the match remains. And now, the opponents for the Final Round are decided. Who will they face off next?!

Those who the Tamakoma Branch members happened to meet at a barbecue restaurant are Ninomiya Squad agents, their opponents in B-Rank Wars Round 8. After getting back to the branch office, Osamu and the other members start developing plans for their final match. However, a question posed by Hyuse to Chika creates a ripple.

Yuuma gathers information about his next opponent. Through Shun Midorikawa, he goes to the border headquarters to get an introduction to Takuma Yumiba, the leader of Yumiba Squad. By chance, Yuuma ends up competing with Obishima of the Yumiba Squad...?

At the Tamakoma Branch, they are developing game plans based on the information that each of them gathered, but it is hard to find the decisive factor to beat Ninomiya Squad in a shoot-out. Upon hearing Chika's decision in person, Osamu starts updating the strategy for the next match. B-Rank Wars Round 8 that will determine their destiny is about to begin.

At last, the Final Round begins. Chika is ferociously attacked by Ninomiya as soon as the match starts. Amid the intense attack, will she truly be able to shoot people for the sake of her teammates?

Osamu attempts to open the way for Hyuse who is encircled. However, receiving fierce attacks from Ninomiya Squad, Ikoma Squad, and Yuba Squad, who want to ensure his dropout, Hyuse faces a desperate situation. What will be the outcome of this intense B-Rank Wars Round 8 battle?

After Hyuse's dropout, a melee unfolds as the surrounding teams take on each other. While intense battles progress, the number of surviving agents keeps decreasing, which is a huge setback for Tamakoma-2, who needs three more points... The fateful B-Rank Wars Round 8 reaches its final phase!

Tamakoma-2 and Ninomiya Squad, the last two teams left, have a head-to-head fight. Ninomiya Squad awaits Tmakoma-2's action. Yuma and Osamu begin their attack simultaneously, which means Tamakoma-2 sets about their last showdown! B-Rank Wars Round 8 is finally coming to its end! What will be the result of this fateful match?