In the year 3039 of the Yuanling Era, a falling meteorite was shattered by the joint efforts of nations across Earth. With the emergence of Yuanling Crystals, the veil was lifted on an alien vanguard force. To resist the unknown extraterrestrial lifeforms, each nation independently developed mecha systems powered by Yuanling Crystals, while also sending representatives to compete in selections, forming an elite joint team for collaborative exploration. As the exploration deepened, increasingly powerful alien mechas gradually revealed themselves, and Earth faced an ever more brutal crisis of resource plunder. How can the formidable alien mastermind behind it all be defeated? How can the outbreak of disaster be prevented? A tale of Earth’s defense is about to unfold.