I cannot remember if Falling Blossoms touched on it or not, but the tales of Bakekujira and Hyochakushin could make for good inspiration for town-scale mysteries and hunts that affect a place, its people etc. - 'weird thing comes ashore, strangeness follows' is a classic cosmic horror setup explored in a few Junji Ito works and at least a few pieces of Lovecraft-derived media, turning sacred and prosperous events into something cursed and dark