5012 A.D. Earth has been suddenly invaded by aliens who have deployed mechanical life forms. The extinction of humanity is imminent, but a small group of survivors have taken refuge on the moon and are organizing a counter-attack by building android soldiers. But they are no match for an enemy capable of infinite multiplication. The last hope lies with a new generation of female androids, the Yorha unit, and more specifically with 2B. Will they be able to take back the Earth?