A Remnant of The Past
Humanity finally achieved the impossible. United as one race and managed to solve all of the problems on earth, they set their eyes on the sky. It all started from the colonization of the moon. After the moon became a fully-fledged colony, humanity launched its largest operation. Code name, Expansion. The project sent people across the universe to habitable planets and built settlements to ensure humanity's existence in the cold and indifferent universe. However, some of the colonies rebelled against the Earth government. They formed the Separatist Society, while Earth and colonies that stayed loyal formed the Earth Federation. It was the beginning of a long and harsh civil war. It was the reason mechas were created. And the reason Taki and Luna met in the first place. However, their relationship didn't last long as one of their mission went horribly wrong.