The distant future, 5012.
The sudden aerial invasion of Earth by ＜Aliens＞ and their creations ＜Machine Lifeforms＞led mankind to the brink of extinction. The surviving number of humans who took refuge on the moon to organize a counterattack using ＜android＞ soldiers to recapture Earth.

However, the war reaches a stalemate as the ＜Machi...