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In the future, when the cosmic warping technology is becoming perfect, human beings will leave the already devastated earth and come to their new home star, Ortus. Due to the need for a large amount of resources in the new era of technology and the ecological protection of Ultras, the united human beings have ignited a new war into the universe. After years of war, a small number of humans developed a powerful mutation. For these mutants, the empire used generous rewards as a inducement to form a powerful force - the Guardians. Decades later, a guardian unexpectedly returned to Earth, and he actually met a young man on Earth, and everything started from there.