In the near future, forces from all over the world will compete for interests, and disputes will arise everywhere. Noah Technology Corporation has given priority to the development of a powerful extensible tactical exoskeleton - [Aita], and built a huge circular orbital base equipped with super weapons - [Sky Dome] above the equator to monopolize resources. The sky was covered by huge steel, darkness shrouded, despair spread. As a result, the major forces of human beings united and launched a counterattack against Noah Technology Corporation. This war almost wiped out the ecology of the earth's surface. Since then, various forces have jointly developed a new type of combat mech [Aita], established the "Human Alliance", and entered into a confrontation with Noah Technology. Somewhere in the world, the Ninth Agreement, a combat organization directly under the "Alliance of Humanity", is waiting for a visitor... [Executive Officer] Your arrival will become a ray of hope for the girls of [Aita], illuminating The long night in the ruins of the doomsday.