During the One Year War in U.C. 0079, a brutal conflict unfolds between the Earth Federation and the Principality of Zeon in the “Thunderbolt Sector,” an area filled with debris from the former Colony Side 4 “Moore.” After managing to penetrate Zeon’s sniper territory, Io Fleming, a top pilot for the Federation and a lover of jazz, is entrusted with piloting the newest Gundam prototype.