Kazuki started writing novels when she was in her second year of junior high school. After taking an entrance exam, she entered into a national university before graduating and becoming busy with work, stopping her from writing. Once she was married and her child entered kindergarten, Kazuki had more free time, which she used to start writing again. From 2013 onwards, she started publishing her novel Ascendance of a Bookworm on the user-generated novel publishing website Shōsetsuka ni Narō which saw success. In 2015, she officially debuted with said series under the T.O. Books imprint.
Keep in mind that this book only has one short story, but it also has a lot of artwork, and I enjoy the long Q&A section as the author answers a lot of questions about the series. And of course there are some comics. I think these are definitely for the big fans of the series. I kind of wish these came with at least two stories, though.
It is the 6th fanbook of the series, so I got what I expected: art, a decent short story, a long Q&A, a few manga pages and of course talk about the voice acting.