'Our target is OZ!' is the rallying cry of the five young Gundam pilots that fell to earth like meteors. They begin to attack OZ facilities scattered around the globe. Trowa, in the Heavyarms, launches a fierce attack on an MS factory on Corsica, when suddenly the Gundam Sandrock appears, with Quatre in the pilot's seat, leading a Maganac corps. The battle between these two Gundam pilots, who had been unaware of each other's existence until they end up engaged in combat, takes an unexpected turn...