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Humanity discovered aliens. The arrival of aliens forced humankind to advance in science and technology. Humanity entered the three-star coexistence era of interstellar development. We thought we could coexist peacefully with aliens. However, one disaster after another befell us! Human beings survive tenaciously. The alien army arrived. Human beings thought it was accurate enough. As a result, it ended in a disastrous defeat. Human beings thought their world was over, but unexpectedly a huge turning point...