2050: fossil fuels are nearly depleted and the world is on edge. The European Asia Commonwealth and the Pacific Rim United States — the two global superpowers — have been racing to develop lunar military bases, positioning tactical beam weapons on the Moon to deter attacks on the colonies. With disputes multiplying over mining rights, weapon placement, and space colony jurisdiction, heroes of the Pacific Rim United States climb into their AS 117 Assault Suits and go to the battlefield to settle the conflict once and for all.