It's the year 2062, two decades after a big labor automation experiment went wrong. However, Artemis, the project's artificial intelligence, had decided to fight humans, and the ensuing battle wreaked havoc on the planet. Empress, a lone girl, awakens in a base's basement laboratory. She is one of humanity's three remaining protectors. She, on the other hand, has no recollection of what happened previously. All she knows is what a peacekeeping force colonel tells her. Artemis is building a space elevator to connect the Moon and Earth, and Empress has been instructed to destroy it before it is finished. The hordes of huge mechanical soldiers being mass-produced on the Moon will be able to use the elevator once it is finished.