I'm a librarian who loves anime, manga, and reading a wide variety of genres.
Fletcher seems to have finally realized she doesn't have to infodump how Celaeno works in each and every one of her books. However that means that, even though her site lists this as chronologically the first book, newbies would probably have an odd experience if they started here. This page has the book's first mention of a male character.*
* The Celaeno series takes place on a planet where all humans and animals imported from Earth are female.