Urban legends again, huh
Looks like tengu are helping kappas to clear the streets at night and prevent occasional drunkards from approaching Nitori. Now, for the most interesting part: what is Nitori doing there? Is she going to help tengu spread yokai influence over the village? To me it looks like she is in sort of a trouble, maybe she lost something, or just has to carry out a perplexing task, from tengu or ortherwise