The game begins with the approach of spacecrafts transporting enlistees to Neo Venus Construction Inc. (NEVEC) Academy's educational institutions on the planet E.D.N. III. Bren Turner, a candidate from E.D.N. II, is on board among the new recruits when the fleet is suddenly attacked by mysterious VSs. To confront the hostile force, Instructor Walter Stingray selects Bren to pilot a prototype VS equipped with a next-generation AI, capable of even autonomous behaviour. As the new "master" of this state-of-the-art machine, Bren designates it with the name "Gingira" and joins Walter to defend the fleet.
Source: Wikipedia, "[en.wikipedia.org/wiki/E.X._Troopers E.X. Troopers]", available under the CC-BY-SA License.