I bought this a while ago and have been putting it off reading for a couple of reasons, one of which is that the anime version of Bookworm is one of my favourites. It's kind of the antidote to generic isekai anime and I can't wait for the next season to come out. But would the book match up to my expectations...
So, a book-obsessed Japanese college student named Urano is about to graduate and start her dream job as a librarian when she's killed in an earthquake, crushed under a toppling stack of books. Her last wish is to live her next life surrounded by books, so when she wakes up in a world where the printing press has yet to be invented, she's not happy. She is, in fact, somewhat irate. To make matters worse, she's now inhabiting the body of Myne, the second daughter of a soldier and a dye worker. They're poor. Dirt poor. Her chances of ever seeing another book are about as high as her reaching the moon. And she's a sickly child, weak and barely able to walk down a flight of stairs without stopping to rest for five minutes. Apparently, when they rolled the dice for her reincarnation, she got a critical miss. She decides that if she can't buy a book, she'll make one, and thus begins her adventure.
Clearly, this is not your typical isekai. Action packed it is not. Myne is not the superpowered prodigy that's going to defeat the demon king (because there isn't one just for starters). Her aim is to survive long enough to make a book. She has some advantages being a 20-something mind in a child's body, but her disadvantages are a list so long it would fill its own book. She is alarmingly competent in areas that prove useful when stuck in a medieval world, but she screws up a lot and success does not come easy to her. She can't even read and write when she starts out (though she does get to magically understand the spoken language). Just the fact that she's not hypercompetent is a refreshing change. She actually does have a sort of superpower, but at this point in the story it's not apparent, and it also happens to be killing her, so I don't think you could describe her as OP.
The worldbuilding is excellent. A lot of thought has gone into Myne's world. In this volume, the reader can see that there are some fantastical elements to it, but Myne hasn't figured it out yet because they really aren't very overt at all. There's a radish that screams when you cut it. She's told to sear some mushrooms otherwise they'll 'dance' when she tries to cut them up. She hears about a tree with a totally weird lifecycle, and if she'd seen it, she might have figured out what kind of world she's in, but she did not. She thinks she's in a mundane medieval world and, to all intents and purposes, she is. And it's very detailed, though you'll see less of it in this volume since Myne spends a lot of time at home, too sick to really see what's outside the front door. Still, you get the feeling you could live in this world if you had to. Pray you never have to.
Differences from the anime: More detail on a bunch of stuff. There's a big chapter on cooking (because this is a light novel) which became a lot less in the TV version. Anime Myne is less obsessed with Japanese food replication. Novel Myne is, as I was worried she would be, less likeable than anime Myne. I've had this happen before. The more internal monologue you get to see, the more their characteristics make you want to slap them. Both versions are obsessed with book to a degree that exceeds reason. Anime Myne stops being quite such a selfish brat faster. Urano may have been in her twenties, but she acts like a petulant thirteen-year-old. Which I think is true in both versions, but it's just more obvious in the novel. There are a couple of bits in the book trimmed from the anime, probably for length, but it's not much. For some reason, Tulli's hair ornament is lacework in the novel and crochet in the anime. And Tulli became Turi, even in the English voicework.
Fundamentally, I may be going a little easy here because I like the anime, but this is a good read. Despite cutting off quite early in Myne's story (the first 'volume' is split into several parts), you do get a strong feeling of progression, and you're left wanting to know more. The world is complex and interesting. Even if the protagonist isn't quite as likeable as she could be, you can empathise with her, and you want to see her succeed. Technically, the end is a cliffhanger, but it doesn't feel like one; more like a natural break before the next part of the story starts.
I recommend this book, so long as you don't want sex and violence in your fiction. I'd even recommend it to people who don't necessarily like light novels or fantasy. I suppose it's a little like 'Game of Thrones' or something in that respect: at the start, there's no fantasy in this fantasy.