In the future city "New Ark" where memories are regularly erased, top memory restorer Ling Su accidentally touched the buried taboo truth while repairing the "abnormal memory" of a mysterious girl Ella. That fragment of memory not only points to the forgotten world outside the city, but is also related to his sister who has been missing for many years. In order to retrieve his sister and the life that was taken away from him, Ling Su and Ella teamed up to embark on a dangerous journey to confront the huge system and awaken the sleeping world.
