I can't tell if those innkeepers are actually yokais or just cannibal humans... Hopefully, it's the former. The latter is a bit too disturbing even for a fun series like this.
I do wish we got more fanservice tho. But the lack of fanservice pretty much confirms that Urusei Yatsura is not an ecchi series.
So many people just watch the first episode or read the first chapter of the manga and casually write off the whole series as an ecchi, harem show. As a fan of Urusei Yatsura, it's pretty frustrating to see.