In the year 2047, an alien life-form codenamed FOS invades Earth and smashes through the world's major cities in one wave. The earth unites to fight back and puts up a Diffuser in place to stop further invasions 3 years after. Now in 2053, a plan is made for a last counterattack that must disable the Diffuser for an offensive...and Akeshima Taishi, who lost his father to the FOS when they first invaded, may finally get his revenge.