"Fog City" is a coastal city shrouded in light fog all year round. On the surface, it looks like a bustling modern city, but in fact it hides a large number of "abnormal events" that cannot be explained by science - disappeared streets, repeated dates, talking old objects, "strangers" who only appear under certain conditions, etc. The history of the city can be traced back to ancient times. There are relics related to "anomalies" buried underground. The fog is a "buffer zone" for the "abnormalities". Strange things happen frequently when the fog is thick.
