All main antagonists of this world have been defeated, all major enemy organizations have been destroyed. The peace that everyone had waited for so long has reigned. But with no danger, special forces that serve as a shield against any threats have become useless. Our protagonist, the commander of Iron Hand District's southern sector fell into depression. At this time on the city's outskirts, radar picked up an unknown spaceship... Perhaps this is a dangerous storm after a long pleasant calm.​