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!

Aftokrator's humanoid Neighbors are unveiled. These so-called Horn Triggers overwhelm the Border agents with powerful Triggers! The A-rank Kazama Unit uses Kikuchihara's Side Effect in a skillful combo play against Enedora, but will their luck continue?

Kizaki, Karauma and Konami fight the sinister Hyuse and Viza so that Osamu and Chika can escape. Meanwhile, Ranbanein easily defeats Chano unit and takes on Yoneya, Izumi, Midorikawa and Azuma's combined forces. Can Jin's worst case scenario be prevented?

Kizaki has figured out Hyuse's Trigger, Lambiris. He orders Karasuma and Konami to protect the city while he holds off Hyuse and Viza.

Viza and Hyuse continue to pursue Chika, but Yuma and Jin arrive just in time. Yuma faces off against Viza while Jin battles Hyuse. Osamu and Karasuma lead Chika and the C-rank agents to Border HQ. However, Enedora's rampage has the HQ in chaos!

Suwa unit traps Enedora in a virtual training room. Director Shinoda goes to offer them back-up, and the tides begin to turn for Border. Mira's 7 Rabits block the evacuees led by Osamu, as the Aftokrator leader Hyrein heads out to capture Chika!

Hyrein's attack turns Chika into a cube. Osamu blames himself, but is inspired by his fellow Border agents to race for Border HQ in an attempt to save Chika

Director Shinoda corners Enedora in the virtual training room. However, Enedora's powerful Black Trigger attack are more than a match for the Border agents' group attacks. Meanwhile, Karasuma faces Hyrein and activates his true power, Geist!

Karasuma uses his personal trigger Geist against Hairein. He can gain strength and speed, but he has only 200 seconds left to be able to fight.

Miwa uses a trigger Lead Bullet against Hairein. Meanwhile, Yuma decides to carry out a desperate attack against Viza.

Yuma defeated Viza, but he has a few Trion left. Miwa was moved away from Osamu by Mira's trigger. Now there are only seven seconds left until the turning point of the future!

Aftkrator withdrew from our world and the 2nd large-scale invasion is over. Although Chika was saved, Osamu lost conscious. Osamu remembers why he joined Border in his dream.

Osamu becomes conscious, and talks with Yuma after hearing the situation from his mother and Chika. One of higher-ups Karasawa takes him to the press conference by Border.

Many journalists ask the higher-ups of Border about responsibility for damage caused by the battle. Osamu hears about Netsuki's plan from Karasawa, and then he steps forward in front of the journalists and speaks his thoughts.

Yuma and Chika won their first Rank Battle as Tamakoma Second Unit in front of injured Osamu. Their next opponents are the 8th place, Suwa Unit, and the 10th place, Arafune Unit. Osamu can't decide what tactics to use against them.

Osamu recovered and rejoined his unit. Tamakoma Second had the right to choose the location this time, and they chose an urban stage with difference of elevation that snipers like.

The match seemed that it would favor the unit with the most snipers, but Arafune Unit is being driven into a corner by rest of two units. Arafune used to be an attacker, so he launches an attack on Yuma, with a sword type trigger Kogetsu.

Tamakoma Second's next opponents are the 13th place, Nasu Unit, and the 9th place, Suzunari First Unit. Yuma gets a chance to challenge the attacker of Suzunari First, Kou Murakami to a solo match.

Murakami's side effect is especially troublesome issue. Osamu thinks about how to prepare for the next Rank Battle.

The Rank Battle started. Nasu Unit takes tactical actions as planned in the storm. However, Chika's sniping changes the whole situation.

The agents have been divided into east and west across the river. On the west side, a three-way battle between the attackers begins.

On the east side, Kuruma and Betsuyaku are at the mercy of Nasu's shooting. Osamu doesn't want them to be defeated faster than him, so he support them. On the west side, Yuma enjoys fighting with Murakami.

Chika breaks the bank of the river by her sniping, and draws the water into the city. Osamu wants Yuma to join him as soon as possible.

Mikumo Squad joins the B-rank upper tier. The fight against the top B-rank squads will be a touchstone for promotion to A-rank. Anticipating this, Osamu struggles with his inability to score a single point on his own and comes to a conclusion.

Start of World Trigger new arc, Toubousha-hen.

Unknown Trion soldiers show up at Border HQ. Jin and Tachikawa take them on.

Zeno, a refugee from Elgates, begs Yuma and Osamu to harbor Lilith and him during their stay in this world. With Chika taken hostage, Osamu and Yuma have no choice but to agree. As they return to the Shizuka City retreat, an unseen assassin strikes!

Kazama Squad heads into combat as Gojima City is attacked by new Trion soldiers. Osamu tries to befriend Zeno and Lilith. Zeno offers to reveal his past, if Osamu will agree to a one-on-one fight. How far will he go to learn the truth about Elgates?

Despite Lilith's best efforts, she can't hide her loneliness. Chika and Osamu work with Kitora and Midorikawa to try and cheer her up. At that moment, Karon and Gieve make their move, commanding Trion soldiers with special abilities.

While studying with Yoneya and Kodera, Miwa sees young siblings and is reminded of his past. The peace is shattered by an attack from Gieve's Spider-type Trion Soldiers.

Zeno's devotion to Lilith leads him to treat Yuma and Chika like tools, enraging Osamu. Meanwhile, Gieve and Karon threaten Shizuka City with massive Trion soldiers! As Osamu's team joins Kitora in defending the city, Gieve isolates Osamu and Zeno.

Arashiyama Squad gathers Border's aces! Arafune and Murakami join in the battle, destroying Gieve's Trion soldiers. But Gieve's plot to blow up Shizuka City using massive Trion soldiers proceeds. As Osamu comes up with a plan, Zeno takes his own action.

Shiori takes Yuma, Osamu, and Chika on a relaxing trip to Shizuka Marine World with Zeno and Lilith. But the peace is interrupted by an attack by Gieve's powerful Trion soldiers. Lilith's body reaches its limit and begins to change, revealing her secret.

Lilith reveals her true power in order to save Xeno and Yuma.

Yuma, Chika and Xeno take the fight to the enemy in order to rescue Osamu. However, a cunning trap separates them, forcing Yuma into a one-on-one fight against Giev. A Trion soldier generates a mysterious virtual world where Yuma faces an unexpected foe.

Zeno and Chika find Osamu, while Yuma continues his fight against Giev. He struggles against Giev and Charon's skillful coordination, so similar to what he had with Replica. At the same time, a new Trion soldier threatens Osamu, Chika and Xeno.

Yotaro heads towards Shizuka City with Raijinmaru, hoping to catch up to Konami. He meets a troubled young girl named Cocoa and befriends her. As a violent fight between Border agents and Trion soldiers breaks out, Yotaro's true battle begins.

Gieve and Charon begin their attack on Yuma.

Giev's secret is revealed. Just like Lilith, he's a Humanoid Trion Soldier created by Lamia. Meanwhile, all of Shizuka City's citizens become Charon's hostages. Tachikawa, Kazama and other A-Rank Border agents gather in Shizuka City for the coming battle.

Xeno's hand cuts thin air, and monster Gieve takes in Lilith and takes on a grotesque form.

Soon after meeting and parting with Xeno and Lilith, Yuma, Osamu and Chika begin preparing for their promotion battle.

Aftokrator's Black Trigger user, Enedora, is alive! Enedora sheds new light on the Large Scale Invasion and the reason that Chika was targeted. Meanwhile, B-Rank No. 1 team leader Ninomiya approaches Osamu and Chika. Osamu makes a tough decision.

Tamakoma-2 starts individual training in preparation for the B-Rank rank wars. Osamu visits Arashiyama for shooter training. Chika meets a young boy during group sniper training. Yuuma meets Kageura, an agent that No. 4 attacker Murakami has never beaten.

During their brief encounter, Yuuma senses Kageura's limitless skill. Osamu receives shooter training from Arashiyama and Izumi, allowing him to truly contribute to the team. If they win, Mikumo Squad's promotion to A-Rank could become a reality.

Ninomiya Squad, Kageura Squad, Azuma Squad and Mikumo Squad face off! As tensions mount, each team targets Osamu and closes in. Meanwhile, the two strongest B-Rank agents, Ninomiya and Kageura, assess the situation. Can Mikumo Squad survive the onslaught?

Osamu is quickly knocked out of combat by Azuma, former leader of an A-Rank No. 1 team. Chika tries to overcome her inability to fire on humans, but her sniping reveals her location. Meanwhile, Yuuma enters a battle royal against 5 Attackers.

Yuuma faces Kageura. Ninomiya takes advantage of this to attack them both. After the battle, Osamu is devastated by his defeat. Kazama's advice leads him to make a major decision for the sake of the team, just as a new threat approaches Mikado City.

Shinoda announces an imminent invasion by a new Neighbor country. Tachikawa and Kazama Squad are assigned to deal with the threat, based on Jin's predictions. Osamu follows Jin's suggestion to add a new member to Mikumo Squad.

After the Rank Wars against the B-Rank upper tier squads, Mikumo Squad tries to up their game. Yuzuru gives Chika an idea for overcoming her weaknesses, and Osamu gathers information about Hyuse, while an A-Rank Team leader tries to headhunt Yuuma.

Osamu continues to try to improve himself, Chika confronts her faults, and Yuuma has faith in them. Mikumo Squad's losses in the B-Rank Rank Wars motivate them further. As a new Neighbor invasion of Border HQ begins, can they open a path to the future?

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?