Fifteen years have passed since the event that changed history. Flare Prime, under the guidance of United Nations, prospers and develops. It's nations, united under the UNSA Andromeda Branch banner, look into bright future. However, old enemies long presumed dead or missing return to bring chaos. A new war is on the horizon and the outcome will decide the fate of billions of lives.

Empire growing in fire will end in blood. When Gate appears on Human colony of Angier Prime, Human forces and their allies decide to work. Forces are being sent on the other side. The battle begins, as armies from two completely different eras clash. However, this war is just a beginning of something new, as ancient secrets start to come out to the light...

During battle with Neuroi, Gertrude Barkhorn lands in world, where Neuroi never existed. World, torn apart by war, on which fate of galaxy depends. War between standing on a lost position Resistance and Holy Order, wanting to enslave all beings. Now, as a member of Resistance, she has to fight Holy Order, if she wants to return back home.