This is Romeo's first novel after starting his career with eroge, and that jump is the only explanation I can think of to explain why he doesn't get the concept of giving the reader an incentive to read more. It takes about 80 pages to get to the first concrete mention/explanation of a fairy, and until then it's very standard peaceful post-apocalyptic stuff.
If you manage to push through that start with blind faith it becomes better, then it gets really fun for a bit then back to moderately fun for the rest of the book with some spikes. I don't really see why the second story lasts for 120 pages when it could be done in 20 with a better pacing, but at least we get to see the fairies (especially Chikuwa) for the whole duration, so I'll forgive it.
Still, I finished the book and enjoyed it despite some issues, but I still haven't been given any reason to read more. In the afterword (which worsened my previously neutral impression of the author), Romeo mentions the foreshadowing he hid here and there that might come together eventually, but...that's not how you write a novel. You can't just say, "I wanted to write a mindless and relaxing novel, but I'm just too good for that so I incorporated a bunch of stuff I'll use in 7 books that will blow your mind, I'm just that good," and expect people to keep reading with that flimsy promise. Just write a good book instead of acting like a fraud.
Anyway, this was my first exposure to Romeo and to this series (apart from one or two episodes of the anime I saw years ago and barely remember), and I'm not sure I want to read more of either, but I might if I find myself too bored. (It still doesn't accomplish much more than what a somewhat clever weekly gag manga would, though.)