Honzuki no Gekokujou: Fanbook (Novel)

The official Ascendance of a Bookworm fanbooks add a slew of additional content to the main series, including color and cover artwork, short stories, pages of regular and four-panel manga, design sheets, and Q&A sessions with author Miya Kazuki containing lesser-known details about the plot as well as information on how she planned out and developed the series. *Source: J-Novel Club*