Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. Upstanding Osamu always does the right thing, whether it means pitching in to save Earth after school or turning the other cheek to bullies. But when he meets a feisty humanoid Neighbor named Yuma, everything that he thinks is right is turned on its head. Can the two natural enemies ever become friends?

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. Ever since meeting Yuma, Osamu has protected the feisty Neighbor’s secret through a combination of covering up and taking credit for Yuma’s actions. Turns out, though, Yuma isn’t the only person Osamu’s been protecting. He sets in motion a plan to help his friend Chika, who for mysterious reasons seems to attract Neighbors. And it also becomes clear that Osamu isn’t covering for Yuma as well as he thinks…

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. Border headquarters wants Yuma’s powerful Black Trigger—and they want it desperately enough to send their top three squads to steal it. The Tamakoma branch is one step ahead, having already safeguarded Yuma, Osamu and Chika by recruiting them to their group of eccentric and talented agents. And Jin’s precognition powers put him two steps ahead: he ambushes the thieves en route!

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. Should Border, Earth’s defense agency, admit a Neighbor into their ranks? Jin and Arashiyama Squad think so, and they clash against headquarters’ top agents to preserve Yuma’s right to enlist. After the brutal fight against his friends and peers, Jin makes an unimaginable sacrifice to put an end to the hostility and protect Yuma’s future at Border.

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. Border headquarters is abuzz with gossip about talented new rookies Yuma and Chika. But it’s Osamu who attracts the most attention when an A-Rank agent challenges him to a duel. Then it’s Yuma’s turn to fight when another A-Rank agent challenges him! Plus there’s that meeting with Border’s top brass that they just got called to… Is there such a thing as too grand an introduction?

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. It’s a Neighbor invasion! Trion soldiers swarm Mikado City, wreaking havoc and capturing isolated Border agents. When the sinister humanoid Neighbors orchestrating the attack target Chika for her massive Trion, Osamu may be the only one who can save her! But can a B-Rank agent compete against the surprising power of this new alien foe?

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. Humanoid Neighbors from another dimension enter the battlefield for the first time! With strange Triggers that defy explanation, the Neighbors make quick work of Border’s top agents until they start to fight smart. Can Border turn the tide of battle in time to save the Earth?

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it. As the Neighbor invasion continues, Osamu’s brave defense of Chika lands him in combat against the Neighbor commander! Border’s weakest agent will have to do better than his best to win against a Trigger that seems to generate life itself.

ボーダー本部基地で暴走を続けるアフトクラトルの近界民・エネドラ。強力な黒トリガーを持つ相手にノーマルトリガー最強の男、本部長・忍田が応戦する！！　一方キューブ化された千佳を持って基地を目指す修は！？

キューブ化された千佳を守りながら、基地の手前に辿りついた修。しかしあと一歩のところでハイレインとミラに襲撃されてしまう！！　修を援護するため、遊真や仲間も奮闘するが！？　大規模侵攻編終幕！！

A級隊員になるためB級のランク戦に臨む修たち。B級中位グループの長距離戦型・荒船隊と接近戦型・諏訪隊との三つ巴の戦いは白熱していく！！　相手の戦術を破るため、作戦を練り上げた修たち玉狛第2は！？

混戦状態が続くB級ランク戦第3戦！！　遊真・村上・熊谷の攻撃手3人が激突する西岸では、那須隊の狙撃手・日浦が均衡を崩す鍵に…！？　一方の東岸側では、那須を中心に射撃戦が激化！！　白熱する勝負の行方は！？

隊長として戦力になりたい──B級上位部隊と戦うランク戦第4戦を前に、自らの成長を模索する修。A級隊員との特訓を経て、覚醒なるか！？　B級2トップ・二宮隊、影浦隊との対戦で玉狛第2の真価が問われる！！

迅を玉狛第2に勧誘する修！！　大胆な行動の裏には秘めたる想いがあった！！　一方、ボーダー本部では、上級部隊隊長による緊急防衛対策会議を招集！！　大規模侵攻の爪痕が残る中、近界から迫る新たな脅威とは！？

新たなる近界からの侵攻者・ガロプラ！！　その目標である遠征艇をめぐりボーダー精鋭vsガロプラの攻防戦が勃発する！！　ボーダー本部基地の内外で繰り広げられる激戦の行方を左右する、不確定要素とは──！？

ガロプラとの攻防終盤、玉狛支部の捕虜・ヒュースがガロプラのレギンデッツと対峙、そこに陽太郎も現れる。帰国を望むヒュースに、レギンデッツが出した条件とは！？　そしてランク戦、玉狛第2が新たな戦術を！！

ランク戦第5戦も終盤、柿崎の反撃に深手を負った遊真。玉狛第2に勝機は！？　そして香取隊の葉子と華、二人の過去が明らかに！　さらにヒュースの入隊をボーダー上層部に進言する修は、新たな問題に直面し！？

全部隊が転送されランク戦第6戦が開幕！　序盤、王子隊は修に狙いを絞る策に出る。対する玉狛第2の戦略とは…！？　また生駒隊は生駒が破壊力抜群の旋空弧月を炸裂させて…。大乱戦の展開の中、生き残るのは！？

玉狛に古参の二人が帰ってきた。二人が修たちに与える影響とは!?　さらに支部に住むことになった修は、ある古い写真を見つけるがそこに写る人物とは…。ランク戦第7戦開幕間近、隊員たちの思いは交錯する!!

鈴鳴第一の環境戦術を封じた遊真とヒュースは、影浦隊と鈴鳴の戦闘に合流。ついに玉狛第２の隠し玉・ヒュースが本領を発揮する!!　しかし彼はなぜか、切り札の変化弾を使わず…。ランク戦第7戦の行方は!?

B級ランク戦最終戦が迫る中、「おまえは人を撃てる｣と言うヒュースの言葉に、千佳は激しく動揺する。一方、弓場隊対策の為に修と遊真は、緑川からある人物を紹介されて…？　果たして玉狛第2が採る戦術とは!?

ランク戦ROUND8、ヒュースはライバルに囲まれ、深刻なダメージを受ける。勝負の鍵は、千佳が人を撃てるかどうかと、対・二宮の戦略にかかる。玉狛第2の近界遠征が懸かったB級ランク戦上位最終戦、決着!!

玉狛第2がランク戦第8戦を制し、遠征選抜試験への切符を獲得！　そしてB級中位最終戦では香取隊、諏訪隊、那須隊がそれぞれの未来を賭けて鎬を削る!!　一方、ボーダー内部では遠征に向け動きが活発化して…。

遠征選抜試験が始まる！　試験は部隊をシャッフルして行われるため、玉狛第2のメンバーも別々に…。しかし修たちは全員で遠征に行くことを誓い、それぞれの臨時部隊で1週間の閉鎖環境試験に挑む…！

閉鎖環境試験2日目開始！　難解な戦闘シミュレーション演習の初戦で、修たちの諏訪7番隊は、暫定1位の水上9番隊と対戦することに！　果たして7番隊は、最下位から巻き返すことができるのか!?

3日目を迎えた遠征選抜試験！　修たち諏訪7番隊は、戦闘シミュレーション演習のユニット増加で苦戦するも、総合順位は上昇。だが突然、香取がやる気を失ってしまい…。主力（エース）の気力消失に、修はどうする!?

Il quinto giorno della prova in ambiente chiuso prevede la creazione di soldati trion, che verranno poi utilizzati nelle simulazioni di combattimento. Data l’ampia libertà lasciata per questo nuovo compito, le squadre provvisorie sono costrette a spremersi le meningi. La Wakamura, fanalino di coda della classifica, decide di affrontare la sfida affidandosi alla strategia di Hyuse…