A legendary army is stationed on a road ravaged by terrorist organizations, cults, and alien beasts, and our story begins with the army's strongest training camp, Black Bird. The protagonist Zou Shang entered the Xuannio training camp for training and was inspired to join the Thirteenth Legion, the strongest army. During this period, he met the mysterious and dazzling Qiao Haomin, who was also a soldier. The two experienced various tests together and performed various dangerous tasks in the Thirteenth Legion. The relationship between the two became deeper and deeper.