Mothman is Real and He Works At a Denny's

A group of friends are roadtripping across the Midwest when they stumble across a seemingly normal Denny's in the middle of nowhere. Upon entering the establishment, they discover that this is very much not the case. Will these three friends make their way out of this strange diner, or will they become permanent patrons?

Cover source: https://foursquare.com/v/dennys/4c08fa4f5214ef3b3c4a5e69 (image was upscaled with AI due to low resolution)