Chu Yue, the top agent of a modern group called the Z organization, is framed and killed. Guided by a system known as the Nine Desolation Mirror, his soul crosses into the Nine Desolation World and takes over another person's body. The system assigns him compulsory tasks, and he must keep training and growing stronger just to stay alive. As he carries out those missions and adventures, he uncovers startling secrets tied to the body's original owner. The more he learns, the clearer it becomes that he is not the system's only host: others bound to the Nine Desolation Mirror also live in this world. The result is a fantasy ONA of 16 episodes.