

Season 1
73 episodes · 2014
One day, a gate to another world suddenly opens in Mikado City. Aliens invincible to Earth’s weapons, called “Neighbors”, start coming over. Earth’s only line of defense is a mysterious group called the “Border” who are armed with weapons called “Triggers”. Four years later, the city has recovered from initial attacks and citizens of Mikado City have started to get used to the Neighbor’s attacks. Yuma Kuga, a transfer student, and his classmate Osamu Mikumo find themselves fighting a Neighbor that suddenly appears. Osamu, who is actually a Border agent, activates his Trigger but is unable to defeat it. This leaves Yuma to activate his own Trigger and defeat the alien. Yuma reveals that he is not part of Border and is actually a Neighbor who has transferred from the other side. (Source: Crunchyroll)
Episode Range
Showing episodes 1-50 of 73
E01Visitor from the Other World
★7Approximately four years ago, a gate to another world opened in Mikado City, and invaders called Neighbors appeared.
E02Neighbor and Trion Soldier
★7.5Border 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.
E03Osamu Mikumo's Ability
★7.5Combat-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.
E04Ai Kitora, A-Rank No.5 Agent
★9Osamu 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?
E05Power Elite, Yuichi Jin
★9Kitora 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?!
E06Chika Amatori's Side Effect
★9Yuichi 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...
E07Miwa Squad's Assault
★9Osamu 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...
E08Black Trigger
★9A-rank agents Shuji Miwa and Yosuke Yoneya make an assault on Yuma without even asking what happened. Osamu calls Jin to help.
E09The Organization Known as Border
★9With 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.
E10Tamakoma Branch
★9Jin encourages Yuma to join the Tamakoma branch. Yuma accepts it if he can team up with Osamu and Chika.
E11The Determination of Each One
★9Osamu hears from Replica about why Yuma came to this world, and from Chika about her true feelings.
E12A-Rank Agents of Tamakoma
★9Osamu, 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.
E13Border Top Team
★9Commander 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.
E14Miwa Corps
★9The 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!
E15Black Trigger Wind Blade
★9Yuichi 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?!
E16To the Future
★9Yuichi 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.
E17Border Official Enlistment
★9The 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,
E18Mikumo Shu VS Kazama Souya
★9Osamu 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!
E19Ranking Battle! Midorikawa Jun's Strategy
★9Osamu 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.
E20Duel! Yuma VS Midorikawa
★9Yuma 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.
E21Neighbor's World
★9The 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!
E22A Large-Scale Invasion Starts
★9The 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!
E23The Holy Land, AftoKrator
★9Border 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!
E24Nestling from Mysterious World
★9Trion 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?
E25Best Force in Border
★9The 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!
E26Fierce Fight! Enedora vs. Kazama Squad
★9Aftokrator'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?
E27Counterattack of Border
★9Kizaki, 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?
E28Star Wand Master
★9Kizaki has figured out Hyuse's Trigger, Lambiris. He orders Karasuma and Konami to protect the city while he holds off Hyuse and Viza.
E29Crossroads of Destiny
★9Viza 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!
E30Enemy Commander High Rain
★9Suwa 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!
E31Mikumo Osamu's Consciousness
★9Hyrein'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
E32Implacable Enedora
★9Director 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!
E33The Terror of Hyrein
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.
E34A Fierce Showdown! The Fight of the Best
Miwa uses a trigger Lead Bullet against Hairein. Meanwhile, Yuma decides to carry out a desperate attack against Viza.
E35The End of the Battle
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!
E36The Have-not
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.
E37A Hero and a Partner
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.
E38B-Rank Wars Begin
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.
E39Suwa Squad and Arafune Squad
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.
E40Setting off! Mikumo Squad
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.
E41An Impertinent Rookie
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.
E42Ko Murakami of Suzunari-1
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.
E43Nasu Squad's Choice
Murakami's side effect is especially troublesome issue. Osamu thinks about how to prepare for the next Rank Battle.
E44The Battle in the Foul Weather
The Rank Battle started. Nasu Unit takes tactical actions as planned in the storm. However, Chika's sniping changes the whole situation.
E45The Thing That Decides the Battle
The agents have been divided into east and west across the river. On the west side, a three-way battle between the attackers begins.
E46The Ace's Willpower
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.
E47The Captain's Pride
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.
E48And Towards the Future
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.
E49Fugitives from Another World
Start of World Trigger new arc, Toubousha-hen. Unknown Trion soldiers show up at Border HQ. Jin and Tachikawa take them on.
E50Invisible Assailants
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!
