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!

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?

Border 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!

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!

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!

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.

Border 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.

Osamu 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.

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!

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,

Yuichi 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.

Yuichi 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?!

The 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!

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

Osamu, Yuma and Chika set their sights on joining the expeditionary force. First, they'll need to win a tournament called the Rank Wars.

Yuma's revealed why he came from the other world. Chika's resolved to join the Border Agency so she can go to the other world in search of her friend and her older brother.

Yuma is invited to join the Border Agency’s Tamakoma Branch, and agrees on the condition that Osamu and Chika join with him.

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

The first round is over, leaving eight duelists to compete for the right to face Yugi for the KC Grand Championship! Unfortunately for Jonouchi, his next opponent is Sieg Lloyd, the dashing duelist who defeated both Haga and Ryuzaki in one turn! Things may be bad for Jonouchi, but Kaiba has his hands full when all the rides in Kaiba Land go haywire! Can Kaiba find out who’s behind all the sabotages before the tournament is ruined?

It’s the second match of the KC Grand Championship as Rebecca faces the kung-fu kicking Asia champion Vivian Wong! However, there’s more at stake than just winning the duel – Yugi’s heart is on the line, whether he likes it or not! At the other end of Kaiba Land, a couple of familiar former champions sneak into the tournament, only to find themselves facing a threat that sends shockwaves throughout all the competitors!