U.C. 0090. The First Neo Zeon War is over, but peace in the Earth Sphere is far from assured. As the Federation moves to rebuild its shattered colonies, the work falls to civilian contractors operating on the front lines of a fragile ceasefire. Darry Neil Guns is a team leader at Monotone Mouse, a Colony Public Corporation firm, and a Gundam fanatic who built his own mobile suit from scrap to prove it. When Neo Zeon remnants attack the reconstruction site, Darry throws himself into the fight aboard his junk-built imitation. But the enemy mistakes it for the real thing, and now everyone wants the Gundam that doesn't exist.