I loved this! It has lots of things I love, books (duh!) and books that somehow manifest something in them into our world (in this case, spirits i.e. kotogami), Taisho period... The story was well-paced although the aftermath of the big end-of-the-book fight was summed up quite quickly. And the characters! I liked them all, especially Akari.
Akari Mitsukuri is independent young woman in Taisho era-esque world (the names are misspelled slightly to show it's kind of the real historical but not quite because there are demons and spirits etc.). One day the company dorm she lives in, burns to a ground and she gets help from a handsome young man who turns out to be a kotogami, a spirit that manifests from special book (kotogatari) when a Narrator reads from it aloud. She is taken to Narration Association where is offered lodging in old house full of kotogatari. She needs a place to stay but there's a problem. She hates fictional stories and has absolutely no wish to become a Narrator even though it seems she has aptitude for it.
She agrees to take care of the house but not do narration and only until she has new place to stay in. But of course a lot of stuff happens and pasts of Akari and the kotogami who helped her, Tomohito, are revealed...
The book's world is very nicely built, you recognize the historical bits, like how women started to work in offices etc. and East and West mixed together but the spirit stuff is woven into that world effortlessly without needing to burden the reader with a lot of explanations (which I wouldn't have minded though).
And like I mentioned, I liked the characters a lot! First, Akari. She's wonderful main character, the further I read the book, the more I liked her. She's headstrong but knows when to back down. She's independent but acknowledges sometimes it's just easier to go with the flow even if she wishes things were different (like when she says Tomohito can accompany her to a restaurant because lone woman gets disapproving looks). And she has some principles more people should take to a heart, for example: manners cost nothing (that doesn't mean she won't voice her opinion though) and if she doesn't like something, she won't go yelling on the barricades (literally with the anti-kotogatari people in this book), she just doesn't engage it.
The kotogami include Tomohito who seems powerful when he first appears but acts later more like Akari's personal servant and is quite emotional (he cries and gets jealous easily). He was quite delightful. And ah, the gap moe. Yes, he has interesting backstory.
House spirit Mayoi was sometimes a bit annoying but since her scenes were here and there, it was okay.
And of course there's a gruffy samurai spirit Kensuke who was exactly like these types of characters are, kinda boorish, likes alcohol but superb fighter when the situation calls for it. And secretly kind and caring. Loved him too.
Yes, this was great read!