| Summary | - Coming soon.
- Xeno reveals his story on how he met Lilith and why they escaped from Ergates. Meanwhile, Gieve and Charon try to make a deal with Osamu by asking him to hand over Lilith to them.
- While waiting for their next match, each participating units, except Ninomiya Unit, reviews their strategy and improving their individual skills.
- Osamu, who is worried with the rumors spread about his battle with Kazama, is approached by a boy, Shun Midorikawa, who challenges him to a simulated battle. Meanwhile, Yūma and Replica discuss about money, with Yūma being unable to understand why is paper money worth more than money coins. He is then approached by Miwa and then by Yoneya, who is taking care of Yōtarō on Shiori's behalf. Yūma offers to help Miwa getting his revenge for his sister's death, but Miwa refuses his help and leaves to a reunion. Yoneya then challenges Yūma to a simulated battle and they and Yōtarō arrive in time to see Osamu's defeat in the hands of Shun. Yūma then challenges Shun to a battle.
- After a hard battle, Tamakoma Second defeats Arafune and Suwa Units and advances to rank 8.
- Yūma and Replica continue to tell Jin and Osamu about Yūma's past and Calvaria's war against Spinthir, explaining how Yūma's father Yūgo sacrificed his life to create Yūma's Black Trigger. Afterwards, Replica asks Osamu to give Yūma a new goal, and then Shiori then tells Osamu about Chika's decision to join Border, and Osamu and Chika discuss it. Osamu then decides to invite Yūma to form a team with him and Chika, seeing her determination, and Yūma accepts with the condition that Osamu is the team captain. They then go back to Mr. Rindō's office to file their enrollment, where they find out Jin foresaw that.
- While trying to go after Konami and the others, Yōtarō ends up getting lost and arrives at Nanao Town, where he met with Kokoa Takeda.
- After Lilith has been absorbed inside Gieve's body, Charon sees it as a failed attempt to capture her and tries to hack Gieve's mind in order to force him to self destruct. Meanwhile, Xeno reluctantly asks Tamakoma Second to help him rescue Lilith.
- For using his Trigger outside of Training, Osamu is told to report to Headquarters later that day. Osamu is concerned about breaking the rules, but Yūma encourages him. After school, Ai Kitora appears to ensure Osamu doesn't run away from his punishment. Yūma argues with Kitora about her grudge against Osamu and her obsession with rankings. As they're bickering, they see an irregular gate open above the city, and a new Trion Warrior appears in the sky, dropping bombs on Mikado City.
- Osamu speaks with his mother, Usami, and Yūma after waking up in the hospital. Then, Karasawa appears to take him to a press conference and give him a chance to defend himself after being used as a scapegoat by Border's upper echelons.
- Due to Charon's plan, Gieve transforms into his combat mode and attacks Tamakoma Second and Tamakoma First. Meanwhile, Yoneya, Kodera and Izumi try to save the citizen of Shizuka City.
- While Osamu and Yūma try to negotiate with Xeno for Chika's release, they were attacked by an unknown assailant.
- Shiori finishes her explaination about Border's Triggers by explaining Optional Triggers. Meanwhile, the battle between Jin & Arashiyama Unit versus HQ's top teams wraps up with Jin's side being victorious. However, to make sure Yūma is not further attacked, he gives Kido Fūjin in exchange for Yūma to be accepted into Border.
- At Kageura Unit's Operation Room, Chika receives a lesson on a new Trigger from Ema. Meanwhile, Osamu and Yūma learn more about Aftokrator from Enedra.
- Osamu and the others brings Xeno and Lilith to Shizuka Marine World to teach Xeno and Yūma on how to swim. Later, Gieve's Trion Warrior attacks them, forcing Lilith to reveal her true identity.
- The battle between Jin, Tachikawa, Kazama and Utagawa rages on, as Jin defeats Utagawa. Back in Tamakoma Branch, Shiori proceeds to explain about the Gunner and Shooter triggers to Yūma and Osamu. Meanwhile, Kitora defeats Yoneya and reunites with Jun, while Mitsuru is forced to bailout after protecting Kitora from Tōma's shots, and they're left incapacitated. Arashiyama Unit then puts up a plan to take down Miwa, Izumi and Tōma, with Jun serving as the bait.
- Following the Rank Battle, Yūma fights Murakami only to lose due to the latter's Side Effect.
- After Osamu is expelled from Border, Jin meets him, and is introduced to Yūma, discovering Yūma is a Neighbor. Yūma then reveals that the irregular gates were being cause by a Neighbor, and Border makes an effort to find and destroy every last one of them. By Yūma's request, Osamu is given the credit for the information. Meanwhile Miwa Unit investigates Osamu, but Jin asks them not to. Later, while waiting for Osamu, Yūma meets Chika Amatori, a mysterious girl who seems capable of feeling the presence of Neighbors. When a danger alarm sounds, Chika runs to the danger zone, and Yūma follows her, saving her from a Neighbor. Osamu, who became a B-Rank Agent, defeats the Neighbor. Yūma then learns Chika's secret, and that she and Osamu already know each other, to his surprise.
- Osamu discusses his unit's performances in the previous matches with Konami and Karasuma. Later, he joins Branch Chief Rindō and Yūma, who are heading to HQ.
- On Chika's request, Osamu asks for Usami's help to cheer Lilith up.
- Kitora strikes a fatal blow to the Ilgar attacking Mikado City, but activates its self-destruct ability. Without being seen, Yūma creates a chain and drags the Ilgar into the river just before it explodes. Yūma causes Kitora to reflect on these events and her opinion of Osamu. At Headquarters, Yūichi Jin enters a meeting with the Administration and Osamu. They discuss Osamu's unauthorized use of his Trigger and the appearance of the irregular gates. Jin is given the assignment to investigate and asks for responsibility of Osamu in exchange. Just before he leaves, Osamu is questioned by Miwa Shūji about the recent battles involving Yūma. Both Miwa and the Commander-in-Chief are suspicious of Osamu's potential contact with an unknown Neighbor.
- With one day left before another planet nation passes by, Osamu and the others discuss their next move. Meanwhile, Gieve grows desperate and launch an attack on Border's Training Camp.
- Osamu and Kitora head to help Chika and the other trainees that are attacked by Rabbits. They succeed in doing so, only to release more Rabbits which cubify Kitora.
- After Yūma's battle with the Neighbor, Miwa Unit investigates the site and is surprised to know the Neighbor wasn't defeated by one of Border's agents. Osamu, surprised by Yūma's revelation that he's a Neighbor, questions him about it. He realizes Yūma isn't used to Earth's customs and decides to teach him about them. The next day, the Third Mikado City Junior High School is attacked by a Mole Mod, and Osamu decides to battle it to protect his schoolmates, despite Yūma's warning that he'd die.
- After Yūma got separated from the others, he is forced to face Gieve, who also possesses a Black Trigger.
- Lamvanein is defeated by the joint efforts of A-Rank and B-Rank agents, while Enedra infiltrates Border's Headquarters. While Reiji and Kirie's battle against Viza and Hyuse progresses, Viza sends Neighbors to the Urban Zone, forcing Kirie to go after them, as Reiji said that's the direction of Kyōsuke's house. Alone against the two humanoid Neighbors, Reiji is quickly outmatched by Viza, who activates his trigger Organon, one of Aftokrator's natural treasures. Hyuse and Viza then go after the C-Rank trainees, but are interrupted by Yūichi Jin and Yūma Kuga.
- In Mikado City, Yūma Kuga transfers to the Third Mikado City Junior High School, where he meets Osamu Mikumo and gets in trouble with the class' bullies. When Osamu and Yūma go home together, the bullies challenge Yūma to a fight, but Osamu tries defending him, getting beaten. After Yūma breaks the leader's leg, a Neighbor attacks. Osamu, revealing to be a Border agent, tries to defeat it but is thrown away. Yūma then takes on the Bamster with his own Trigger, quickly defeating it. After the battle, Yūma reveals that he himself is a Neighbor.
- Tamakoma Second defeats Kuruma and Nasu Units, advancing to B-Rank' top tier, and is set to battle Ninomiya, Kageura and Azuma Units in their next match.
- Jin invites Yūma to join Tamakoma Branch, inviting him to vist, but Yūma asks him to let Osamu and Chika go with him. There, they meet Shiori Usami and Yōtarō Rindō, while Osamu notices how different Tamakoma is from the main branch, and Chika asks Shiori about Border and expeditions. Jin then orders the three of them to choose bedrooms to stay over. Later, when left without anything to eat for dinner, Jin asks for a pizza, expecting that to happen. Then, Mr. Rindō calls Yūma to his office, inviting him to join Tamakoma Branch. Surprisingly, he denies the offer. Yūma then tells Jin about his past and the reason why he came to Earth, while Replica tells Osamu the same story.
- Enedra attacks Kazama Unit and succeeds in defeating Kazama, forcing Kikuchihara and Utagawa to flee.
- When his unit suffer from their first loss in the Rank Battles, Osamu begins to think on how to fulfill his duty as a leader.
- Osamu explains to Yūma and Replica that Chika attracts Neighbors and is also able to feel their presence. After moving to Yumide City Station to talk more reservedly, Yūma explains them why Neighbors invade the city, and Replica offers to measure her Trion, while Osamu and Yūma talk. Shūji Miwa and Yōsuke Yoneya of Miwa Unit see Chika with Replica and assume she's a Neighbor, but Yūma states that he is the real Neighbor and a combat ensues between him and Miwa Unit.
- Osamu and the others go to a training camp in Shizuka City. Later, a mysterious boy appears and attacks them with Trion Warriors, capturing Chika.
- Tamakoma First joins Osamu and the C-Rank trainees to fight off the Rabbits, but the humanoid Neighbors, Enedra, Hyuse, Viza and Lamvanein, arrive.
- Enedra is defeated by the Border agents, and is later killed by Mira. Meanwhile, Mira supports Hairein, and he is able to defeat Izumi.
- Konami and Usami are surprised to learn that Yūma lost a Solo Rank Battle to Murakami, and Shiori explains them about Murakami's Side Effect. Nasu Unit, Tamakoma Second and Suzunari First all prepare strategies for their next match, and Kō Murakami remembers the time Arafune became a Sniper. On the match's day, everyone is surprised to see Nasu Unit's stage choice.
- While working on their school assignment, Miwa, Yoneya and Kodera are trapped by Trion Warriors in Tamaga Tower.
- Osamu joins Yūma and Kikuchihara as they help Kinuta interrogates Enedra. Later, he meets with Ninomiya, who visited Tamakoma Branch to asks Osamu and Chika some questions regarding Mirai Hatohara and Rinji's disappearance.
- The Official Enlistment Day is finally here, and after Masafumi Shinoda and Arashiyama Unit explain how the event works, Yūma and Chika make a flashy debut at enlistment training, with Yūma beating the record in the Colossal Neighbor Simulation and Chika firing a shot strong enough to destroy the base's wall during Sniper training. After Yūma finishes the simulation in even less time after being challenged by another trainee, the No. 2 Attacker Sōya Kazama challenges Osamu to a Rank Battle.
- Osamu, Yūma and Chika are introduced to are introduced to Kirie Konami, Kyōsuke Karasuma and Reiji Kizaki, who are going to be their masters from now on. Meanwhile, Border's Upper Echelons welcome back the teams that were on Expedition, who are finally back.
- Karasuma attacks Hairein in hopes that he can stall him until Osamu can reach the base, but he is defeated by Hairein and Mira's conjunction tactics. Hairein goes on to attack Osamu, who is now in an inescapable predicament. However, Miwa shows up to battle Hairein himself.
- Osamu, realizing his true strength, decides to train to become stronger. After battle training with Kitora, he is challenged by many other Border agents, but is unable to win any match. However, his teammates assure him of his worth.
- On Karasuma's suggestion, Osamu seeks advice on how to become a better Shooter from Arashiyama Unit. Meanwhile, Chika participates in Sniper Training with Natsume, while Yūma fights Murakami in Solo Rank War.
- While Osamu argues with Xeno regarding his methods, Gieve and Charon approach Shizuka City with a giant Trion Warrior.
- Yūma and Viza's battle finally comes to an end, with Yūma emerging victorious.
- Despite Yūma's warning that he will die if he attacks such powerful Trion soldiers, Osamu rushes in to save his fellow students from the Mole Mods. After ensuring most students are safe, he is quickly outmatched, but is rescued by Yūma, who uses Osamu's Trigger to defeat the Mole Mods. Replica, introducing himself to Osamu, gives him an explaination about Trion and Triggers. Afterwards, Yūma lies to everyone, insisting Osamu saved him. Arashiyama Unit arrives on the scene and are surprised to learn that the Mole Mods were defeated by a C-Rank trainee.
- Osamu recalls the days leading up to Rinji Amatori's disappearance as he lies unconscious in the hospital.
- When asked why can't kill Yūma, Jin explains Masamune Kido can't order him directly, as he's part of Tamakoma Branch and thus works under Takumi Rindō instead. Eizō Netsuki and Motokichi Kinuta are annoyed by that, as it's the same thing in the end, but Mr. Kido tells Mr. Rindō to give Jin the same order. He complies, however he gives Jin the permission to go with whatever approach he wants, bothering the other admins. Before Jin and Osamu leave, Katsumi Karasawa asks Osamu what is Yūma's goal, and he explains he was searching for his father's friend on Border. When Osamu is asked by Karasawa what is Yūma's name, Kido, Masafumi Shinoda and Rindō are shocked to discover who his father is. With that information in hand, Shinoda is vocal on his opinion against taking Yūma's Trigger, but, as suggested by Karasawa, Kido decides to wait until the Best Teams on Border are back from expedition to send them after the Black Trigger.
- As the 4th Round begins, Tamakoma Second soon faces a tough situation when they becomes the primary target, as they being perceived as the weakest unit by the others.
- Izumi, Midorikawa, and Yoneya assist the B-Rank teams in defeating Lamvanein.
- Yūma and Jin fight Viza and Hyuse respectively; Suwa Unit fights Enedra; and Osamu, Karasuma, and the C-Rank trainees are attacked by Rabbits. Yoneya, Midorikawa, and Izumi join them. However, feeling that the mission was getting nowhere, Hairein joins the battle himself, cubifying Chika.
- With Chika voluntarily bails out soon after Osamu, Yūma has no other choice but to fend for himself as he is stuck in a Battle Royal.
- Osamu fights with Xeno's Trion Warrior in order to gain his trust.
- After Chika is cubified, Osamu makes it his mission to take her cube to the HQ in safety, swiftly dodging the Rabbits' attacks until Replica comes to his aid and summons Border's own Rabbit. Replica helps Osamu get to the base while Izumi, Yoneya and Karasuma stay behind to fight Hairein and the Rabbits.
- When confronted by the reporters about his blame for the captured agents, he declares that he'll personally go to the other side to rescue them, which leads to Border revealing about the Expeditions. Later, the B-Rank Rank Battles begin, and Tamakoma Second quickly rises to Rank 12 in their first battle.
- Yūma activates his Black Trigger in order to fight a rabbit, but is mistaken by Makoto Chano and Itsuki Fujisawa of Chano Unit with an enemy Neighbor. While they're distracted with Yūma, they're saved from a Rabbit by Arashiyama Unit, who explains to them that Yūma is an ally. Then, the HQ is attacked by a pack of Ilgars, but Tachikawa helps fend them off. When he learns that the B-Rank units are to go help evacuation where it's going slow, Osamu asks for permission to go help Chika, but Yūma is prohibited, as he could be mistaken for an enemy again and is more useful against the Neighbors, but Kitora offers to go with Osamu, saying she "owes them one".
- Replica gives a brief explaination on the Neighborhood and the nations that might possibly attack, Liberi, Leoforio, Khione and Aftokrator, along with wandering nations. All of Border prepare to fight the invaders.
- At Border's HQ, Shinoda and Kido discuss about the possibilities of upcoming invasion with most A-Rank Unit captains. The next day, Chika goes for sniping practice while Osamu accompanies Yūma to see Enedra.
- Tamakoma Second puts their plan to defeat Suwa Unit and Arafune Unit in action.
- As Yūma and Miwa Unit's battle is prolonged, Miwa Unit seems to be getting the upper hand, when Tōru Narasaka manages to shoot his arm, and Miwa weighs him down with his projectiles. However, Yūma copies Miwa's projectiles and uses them about him and Yoneya, effectively incapacitating them. Jin, who had been watching the battle, approaches them, along with Narasaka and Shōhei Kodera. He explains to Miwa that Yūma's Trigger is actually a Black Trigger. After Miwa bails out, Jin and Osamu go to the HQ, while Osamu asks Yūma and Chika to stay together. In the end, Jin is ordered to kill Yūma and capture his Trigger, but says he can't.
- The match begins, with Tamakoma and Suzunari taken by surprise by Nasu Unit's map choice.
- The battle between Yūma and Shun begins, with Shun getting the upper hand in the first two rounds, surprising Osamu and Yōtarō, the latter who gets angered at this. Yoneya explains that it's about the difference in experience, and Yōtarō says that shouldn't matter, but Yōsuke says that's not what he means. After losing the first two rounds, Yūma then gets the upper hand, defeating Shun in all subsequent rounds. In the last round, Shun decides to battle Yūma head on, again losing. After the battle, Shun apologizes Osamu in front of so many people, as it was proposital, but Osamu takes the chance to explain that he actually lost to Kazama 20 rounds and only got a draw in one round. Jin then comes to call Osamu and Yūma to a meeting, with Shun greeting him. Jin, Osamu and Yūma then go to the meeting room, accompanied by Yōtarō mounted in Raijinmaru. There, Border's leaders explain about the upcoming invasion and enlist Yūma's help in identifying the attacking country and preparing for the invasion. Yūma introduces them to Replica, who offers to give them the information they want if they promise to protect Yūma. Kido accepts his offer, and Replica begins his explaination.
- Osamu works tirelessly to find an strategy to defeat Suwa Unit and Arafune Unit, but can't find an answer, while said units also work on their strategies. After a day relaxing around town, Osamu, Yūma and Chika come to a realization.
- After they found out Osamu's location, Yūma, Chika and Xeno rushes to his aid. However, Yūma got separated from the others and forced to face Gieve and Charon on his own.
- With Osamu and Chika's newfound skill, they began strategizing for the upcoming match. Meanwhile, most Border agents are preparing for an invasion from Galopoula.
- Jin begins to fight the personnel sent after Yūma, particularly his rival Kei Tachikawa. Meanwhile, Shiori starts explaining Yūma and Osamu about Border's Triggers and Jin and Tachikawa's rivalry. The Raid Team then divides, with Tachikawa and Kazama Unit going after Jin, assisted by the three Snipers, while Arashiyama Unit takes care of Kōhei Izumi and the rest of Miwa Unit.
- Osamu is meters away from Border's entrance as he is pursued by Hairein and Mira. He manages to save Chika and forces them to retreat; at the cost of losing Replica and being severely wounded.
- Despite knowing he doesn't stand a chance, Osamu decides to accept Sōya Kazama's challenge. After defeating Osamu multiple times, Kazama tells him that Jin gave Fūjin away so that Yūma could join Border. Hearing this, Osamu asks for one more round, this time managing to get a draw. After the battle, Yūma greets Osamu, and he has a short discussion with Kyōsuke Karasuma and Ai Kitora. Osamu and Yūma are then called to the Sniper's training area, where they find out Chika destroyed the wall. Rumors start to spread about the three newcomers, and Jin, told about that, says he already expected that.
- The large-scale invasion has begun, and multiple portals opened in the danger zone. The Trion Warriors were dispersed and the B-Rank agents sent to take care of them. During the battle with the Trion Warriors, a new type, the Rabbits come out of the defeated Neighbors' carcasses and attack the Trigger users. The Invader country, Aftokrator, notes that "Miden" hasn't used its full force yet.
- Osamu and the others continue to train at Tamakoma Branch, with Kyōsuke trying to find different ways to help Osamu train. Later, Mr. Kido sends Border's top three teams along with Miwa Unit to retrieve Yūma's Trigger. As they move towards Tamakoma Branch, they meet Jin, who reveals he foresaw their attack, and he and Arashiyama Unit join forces to battle the Raid Team in order to protect Yūma from them.
- Yūma and Jin decide to battle the Humanoid Neighbors separatedly, with Yūma and Replica taking on Viza and Jin taking care of Hyuse. Jin leads Hyuse to the sewers, while Yūma holds Viza back so that Osamu and Kyōsuke can run away with the C-Rank agents.
- As Pergrande closes in to Shizuka City, Arashiyama Unit, alongside Arafune and Murakami, arrives at the scene as reinforcement in order to help Tamakoma Second and Xeno rescue the captured civilians and stop Pergrande from reaching Shizuka City.
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