During their brief encounter, Yuma 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.

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, Yuma enters a battle royale against 5 Attackers.

Yuma 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.

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?

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.

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!

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

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!

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.

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,

The B-Rank Competition's third round finale! Yuma triumphs while the team leaders fight on the east side. Osamu seeks to change the tide of battle by drawing water into the city and pitting Nasu against Kuruma. The three-way battle is about to conclude.

Yuichi and Yuma join forces...while Commander Masamune begins to fear the power gathering in the Tamakoma Branch.

Kuruma Squad's Murakami and Mikumo Squad's Kuga clash on the West Bank!

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.

The team members are divided due to Chika dropping the bridge. While Osamu goes after points on the east side, Yuma faces off against Murakami and Kumatani in a triple-attacker showdown in the west. The stakes are high for all teams. Who will win?