I'm a librarian who loves anime, manga, and reading a wide variety of genres.
There have been a few word choices that struck me as incorrect, but I've done some checking and now think most of them were just a bit odd. However, one was definitely incorrect - an instance of "ensure" that should have been "reassure."
If this were an e-book, I'd do a quick count of the number of times the words "relinquish" and "creamy" have been used. Probably too many times, especially "creamy."