In a alternate Earth where Technology didn't evolve past 1942, one which is so war torn that constant intercontinental battles happen constantly, something happened. At the beginning of WW3 in 2029, invaders crashed onto the planet. At first, they thought it was a myth, until it arrived at their doorstep. Like a wildfire, the Xikaeda Plague brought forth total and utter brutality. Now that the East and West have fallen, the UAF have taken the challenge to get the planet back.