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AD 5683. The world is in dire straits, suffering from alien attacks all year round, and the earth's resources are facing depletion. Despite mankind's desperate resistance, little success has been achieved, but it seems that the sky has opened its eyes, and the earth has received help from unknown forces. No one knows where they came from, and no one knows when they left, but their appearance undoubtedly brings hope to the earth. However, because the sun has been harvested by alien forces all year round, it has developed in an uncontrollable direction. Human beings are forced to try to make the earth move. However, the good times will not last long. Due to perennial wars, it is expected that in another 40 years, the earth's resources will be completely exhausted. So humans created the "Star Tower" Go find the endless energy hidden deep in the universe.