In the future, a Supernormal Event Processing (SEP) has been established around the world to handle all kinds of supernormal and emergencies. One day, the processing center received a set of fuzzy and mysterious broadcast signals from a certain cave. The center decided to send Task Force 9 to investigate the matter. After passing through the cave, the task force unexpectedly came to an ancient town called Peach Blossom Spring, where they found that all life had died, and another team of task force exactly like themselves appeared in the town.
