The game takes place in the year 2222 following two galactic wars. To settle differences between humanity's seven warring factions, an artificial battlefield called the Fight Domain has been built. There, pilots from each faction will step into mechs called Vital Armors and compete against each other. Before the final testing can finish, hostile, photon-based beings called the Non-Carbide appear on Callisto, one of Jupiter's moons. A time distortion appears in the Fight Domain and begins to expand. Only the pilots of the Vital Armors can stop the Non-Carbides and save time itself!