The story takes place in the fictional modern city "Yong'an City". On the surface it is a prosperous financial and technological center, but underground there are strange forces related to "time folds" dormant - a "Mididian Bell Falling to the Ground" incident a hundred years ago tore the boundary between reality and the "old world". After that, every twenty years, Yong'an City will be affected by Supernatural phenomena occur in "Scale Shift": missing people reappear but have confused memories, old buildings "grow" in the middle of the night, electronic screens bleed red symbols... All of this is related to a mysterious organization "Night Watch" trying to repair "time wounds", and the "Eclipse Sect" who attempts to completely tear apart the boundaries.
