Background and upper part introduction:
Since humans discovered crystals containing ultra-highly concentrated energy in the universe, they invested in the huge development of related technologies. However, they did not expect that energy crystals were already the core of the long-term war between the two other races. Therefore, humans were also forced to fall into the war between the two major races, the Star Race and the Alien Race. In the past wars, although the Star Race living in the Deep River Galaxy had an absolute advantage in technology, they were defeated due to their own divisions and the unparalleled numerical advantage of the alien races. They fled far away from their homeland and finally came to the vicinity of the solar system where humans live. Facing the beast-like aliens, in order to resist the powerful offensive of the aliens, humans and the star tribe formed an alliance in times of crisis, promising to support each other, share interests, and jointly fight against the aliens in the vast space of the universe.