In the near future, corporate chaebols have supplanted governments as the primary source of power, and the wars between them are constant. The Igodra Company's discovery of alien remains in near-Earth space — codenamed Urd — leads to the identification of a previously unknown particle called Delta, which upends every existing military balance. Igodra develops a tactical exoskeleton called Aita using Delta technology and establishes an orbital weapons platform called Gray City above the equator. The other chaebols form the Human Alliance and go to war. The Alliance wins at great cost, Gray City is crippled, but Igodra's fundamental advantage remains intact. The Alliance captures one of Igodra's artificial life bodies and reverse-engineers enough Delta technology to break the monopoly — ending with both sides in a tense, armed standoff that defines the world the game takes place in.