After the last Nergal invasion, the energy transmission system connecting the White Giant to Atra-Hasis was badly damaged, which forced them to change course to Mars. Accompanying them is the Destroyer Normandy and its captain, Lieutenant Colonel Peterson, a war hero who fought in the Battle of Mars.

When Astra-Hasis returns, the Nergals have already completely covered the outside of Earth. Having no other choice, the United Earth Alliance activated the DGI, shutting down all Divine Grace systems. However, this caused uproar in many places, and the DGI could only hold out for a few more hours…