That dark mountain road with a threatening aura... It's so simple but effective. I was actually a little afraid to turn the page before the last one. The stuff about animals hiding is so good too.
The Otherside is such a strange place. I wonder if we'll learn what it is exactly about in the end of this story. So far it seems like it's a place that doesn't abide by the rules of the real world, but also things like them finding these houses and meeting people makes me think there's something deliberate by someone in its construction. Outside of situations that match their psychological state getting manifested.
Well, maybe you don't remember because it's been a while since it came up in the manga, but there are various hypotheses raised by the characters as to the nature of the UBL. But from reading the novels, this is not the kind of story that is eager to provide clear answers.