With Ghost's AI falling into the hands of the North American military, they've come out on top in the autonomous AI race, expanding their territory in Japan. Gashin and Shion continue to fight for a brighter future, but their luck seems to be running out

With Amou and Misuzu's return, Yatagarasu succeeds in turning the tables on the North American military. After their temporary retreat, they once again go after Yatagarasu, but they are no match for the newly upgraded Kenbu, Jogan, and Reiki.

Lead by Brad Watt, the North American military has been working hard to get Ghost combat-ready. Despite it being incomplete, Brad decides to ride Ghost to battle Alexei from the Eurasian military, and a fierce battle ensues

Worried about how closed off Amou has become after his disappearance, Gashin and Shion finally press Amou for answers. Understanding their deep care for him, Amou slowly opens up, and shares details about his time at TRYVECTA's research facility.

There's a new special mission involving the usual Yatagarasu members, but Gai, Kei, and Nayuta are kept in the dark. The members go out of their way to keep this mission top-secret, but will they be able to keep the AIs out of the loop for long?

To counter the NAC's aggressive territorial expansion in Japan, Eurasia, AFTE, and Oceania decide to team up with Yatagarasu, offering the liberation of the Hokuriku region, calling it "New Japan" and allowing full sovereignty.

To discuss the future of New Japan, Amou and Alexei travel across NAC territory. However, before the meeting could even take place, what appears to be an assassination attempt on the life of a NAC congressman causes everything to go downhill.

Unable to prove their innocence in the congressman's assassination attempt, Amou and Alexei are on the run. With Gashin too far away to come help, it's up to Shion and others to save the two before they are captured by the North American military.

Amou and Alexei are safely back with the NJCO, but their battle for their freedom came with a cost. Using that battle and the sniper incident as justification, the NAC has painted them as villains, and plans to launch a large-scale attack on New Japan.

A full-scale war has erupted between the NJCO and NAC. If the NJCO can win this war, they can finally reclaim a part of the territories of Japan. However, if they lose, they will likely lose everything. Who will come out victorious in this Boundary War?

It's the final showdown between the NJCO and NAC. With Gashin and Shion tied down, Amou and Gai must fight Brad and Ghost on their own. Despite their machine specs being inferior to Brad's AMAIM's, Amou and Gai cannot afford to lose this battle.