In the 70th year of the AI ​​era, the revolutionary army committed to global peacekeeping and counter-terrorism operations encountered trouble in the process of updating iterative armaments, and gradually lost its advantage on the battlefield against separatist forces and terrorism... Yang Chu, who developed the second department, decided to subvert the previous battlefield armor design with unprecedented and bold design ideas. At the same time, Mu Ya, a female elite soldier, was urgently transferred back from the front line...a battlefield story about "change" began.