Echoes of Seventh Night

In 2035, the "Silent Era" begins. Globally, at midnight every seven days, a city will randomly fall into "Seventh Night" - a cycle of unexplained supernatural phenomena. In the seventh night, the laws of reality are distorted and evil ghosts appear. If ordinary people fail to abide by certain "night vigil rules", they will turn into new evil ghosts before dawn. Human civilization has retreated to a few "no sound zones" (supernatural signal shielding zones), but the Seventh Night is spreading at an exponential rate. No one knows the source, only that it all started from the black stone bell tower that no one has ever stepped out of.