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In the year 2041, a new enemy — the Zeravire — suddenly appears in the solar system, destroying all military outposts on its path towards Earth. However, a wealthy man named Klein Sandman is already aware of this planned invasion and has been secretly preparing his army for battle. His trump card is Gravion, a giant robot that utilises gravity as its source of energy.…

After the mecha Gravion was able to use its ultimate attack, the Zeravire threat seemed to have been stopped. However, when the attacks suddenly recommenced, Earthgertz and its trump card, the super-robot Gravion, are needed to defend the world yet again. All the while, the Earth Federation Alliance (EFA) is planning to create their own weapon to counter the Zeravire, using…