December 0079 U.C., two brothers are forced to traverse the North American territory as the rear guard of the retreating Principality of Zeon forces. Using MSM-04 Acguy amphibious mobile suits after the Principality fails to capture the Earth Federation’s headquarters at Jaburo. However it is not long before these two brothers are the only ones left alive, and are faced with the prospect of traveling over two thousand miles, with out supplies and back up.

During the One Year War between the Earth Federation and the Principality of Zeon, an aggressor team known as the Nemesis Team is established in the Earth Federation Army.