As a huge conglomerate, Anaheim Electronics has grown into the world's premier military industry after the war. Since the time of the One Year War, the company has repeatedly acquired various companies, and has come to have a great deal of influence over the Earth Federation government, which is responsible for hegemony in the new world line. In particular, the orders for the Gundam development plan that was launched in UC0081 gave us the opportunity to cultivate next-generation technology as a weapon industry. Behind this is the fact that the former Principality of Zeon's armed forces had a munitions industry, and in particular, the acquisition of Zeonic, the leading company, under its umbrella. The RX-78, which was thoroughly designed and developed as a mobile suit against the Zeon forces, was the masterpiece of the One Year War. Mobile weapons were local fighters specialized for combat situations with limited purposes, but it is even said that their technical standards were more than ten years ahead of the Federation Forces. Anaheim is the only company that has made it possible to combine such technology with the Earth Federation Forces Gundam-type next-generation development machine, and this is exactly why the Earth Federation Forces Development Headquarters made a nomination contract with Anaheim alone. I said it was all over. The RX-78GP04G space battle-only high-mobility assault-type Gundam, which was the fourth prototype of the Gundam development plan, had already been completed, but the RX-78GP01 and GP02A, which had just begun practical evaluation tests in this plan, Involved in the conflict of the former Zeon army remnants, the Delaz Fleet, the third draft, GP03, also disappeared in these battles. The Federation Forces Headquarters, which led the development, decided to cancel these Gundam development plans while trying to settle the situation, so Anaheim was forced to make major revisions in the budget. It is said that they were driven to the point where they had no choice but to rebuild while seeing a considerable loss in management. Taking advantage of the abolition of the project, the GP04G was dismantled and transferred under the direction of President Melanie Hugh Carbine. However, O'Sullivan, managing director of the company, tries to transfer and sell this GP04G after a secret agreement with Cima Garahau, who has been secretly contacting him. Of course, it is impossible to transfer the Gundam type mobile suit to the Delaz Fleet, so he instructs the design team of the 2nd Engineering Department and succeeds in transforming the main frame of the aircraft into a new assault type mobile suit. did. The development code was given AGX-04, and the pet name of Gerbera Tetra was used as the secret name. The second engineering department's design team consists of former Zeonic engineers, and they rearranged the armor and propulsion engines of the Zeon-based assault mobile suit without difficulty on the skeleton of the aircraft. In addition, the additional propulsion device Sturm booster, which was an important component in the design proposal, has been changed to a layout that allows the entire aircraft to be compounded. The armor layout of each part of the fuselage constitutes a Zeon's unique silhouette that has a long life in the first bullet test, and it was completed as a fairly strong one composed of the latest Luna Titanium alloy. The power cables, which are efficiently placed outside, are also gathered inside these armors, making use of the technology seen in the late Zeon heavy mobile suits. Of course, a mono-eye is used for the main camera, and it is possible to search for enemies around 360 degrees. The shoulder thruster pods equipped on the GP04 are variable and do not interfere with the combat movements of this machine, and are an important component for making this machine highly maneuverable. The main armament is a beam rifle and a beam saber, which are the basics of the Gundam type. The main weapon beam rifle has been changed to a beam machine gun with a fast firing cycle that uses an energy pack. Also, in this aircraft, the beam saber is stored inside the outer shell armor on the outside of the thigh, and is normally not exposed. The storage design introduced in GP03S Staymen is utilized. The Sturm Booster, which is a characteristic equipment of this unit, is designed to allow rapid movement to the operational airspace and forced withdrawal in an emergency, giving a glimpse of the rationality of Zeon's design in the development of a single assault attack mobile suit. This machine, which was received by Lieutenant Colonel Cima Garahau's fleet, engaged with the Albion Corps' GP03 Dendrobium in an actual battle, piloted by the commander of the same unit, Lieutenant Colonel Cima. This high-performance aircraft exploded and was lost. Anaheim Corporation continued research on the technology for increasing propulsion and extended cruising power cultivated in the GP04G and Gerbera Tetra, and was utilized in the operation of the third-generation mobile suit that was introduced in the Gryps campaign.