Humanity, faced with an unknown but extremely aggressive enemy, was practically swept away by superior power. One by one, any barriers put up fell, opening a direct path to Earth. The panic of realizing the scale of the threat divided people into parts, forcing some to flee into the depths of outer space, and others to fight to the very end, whatever it may be. Paying for any achievements with blood, humanity has increasingly adapted in this endless war of destruction, even changing itself in order to simply fight the enemy on equal terms. But it’s still far from ending...