The story takes place in 2057. Due to the attack of robots, humans have to study superpowers as "super warriors" on the battlefield. Those who fail the experiment will be sent to the seventh district, the poorest. The protagonists of the story, Mo Luan and Mi Fei, depend on each other and face a dark life. They believe that as long as they persist until the age of 17, they can join the army and escape the source of suffering. However, when danger is in front of them and the mystery of their life experience is about to be revealed, how will they choose?