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?!

Round 3 begins in a violent storm. While Mikumo Squad and Kuruma Squad focus on finding each other, Nasu Squad carries out their strategy as planned. Just as Nasu Squad seems to have the advantage, Chika's Ibis strikes. Can Mikumo Squad grasp victory?

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

After Yuma's unexpected loss, the team rushes to find a counter for Murakami's powerful Side Effect. Meanwhile, Kuruma Squad and Nasu Squad make their own preparations for battle as well.

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

Mikumo Squad wins Round 2 and is promoted to 8th rank. Their next opponents are the 13th-ranked Nasu Squad and 9th-ranked Kuruma Squad. Yuma requests Individual Rank Competition with Kuruma's ace Attacker, Ko Murakami. What is Murakami's secret ability?

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?

Yuma joins Round 2, armed with a new Option Trigger. Meanwhile, Arafune Squad finds itself hounded by Mikumo Squad and Suwa Squad. Arafune goes back to his roots as a former Attacker and uses the Attacker Trigger Kogetsu. What will Osamu and Chika do?

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 squad puts into action their plan to defeat the more experiences units. Their trump card will be...

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!

Mikumo Squad's B Rank Competition debut ends in a stunning win. Their next opponents are the 8th ranked Suwa Squad and the 10th ranked all-Sniper Arafune Squad. Osamu tries to come up with a Tamakoma-support strategy, but can he lead his team to victory?

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.

PR Director Netsuki sets up Osamu as a scapegoat for the devastation from the battle. But Osamu speaks from the heart and changes everyone's mind. Next, Osamu, Yuma and Chika must prepare for the next step towards A Rank: the B Rank Competition!

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 wakes up in the hospital, where his mother and Shiori tell him what happened during his week-long coma. Suddenly, Business Director Karasawa takes Osamu out of the hospital to a press conference about the battle. What are Karasawa's true intentions?