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During the Star Sea Colonial Era, Lu Qian, who was proficient in hacking skills, was caught hacking into the bank system and fell into the bottom of his life. With no other choice, he had to participate in the coalition government's "Open Frontier" plan. From a dead otaku to a glorious mercenary, he was lucky enough to obtain the super armor "Retrograde". From then on, he embarked on the road to become a soldier, and gradually understood the truth behind many bizarre events.

In AD 3558, the moon was invaded and captured by the "Cosmic Locusts", the Zerg. After the Zerg multiplied in large numbers on the moon, they used the moon as a springboard to attack the Earth. The United Earth Government organized a global defense force to launch an "insect eradication operation." Wu Yu, a former member of the Lunar Observatory, volunteered to become a mercenary, and unexpectedly received the "Savior System" assisted by a super cosmic civilization. From an unknown soldier, he gradually grew into a combat hero with many outstanding achievements.