斉木楠雄のΨ難 映画ノベライズ みらい文庫版 (集英社みらい文庫)
Shueisha Mirai Bunko ver. (‘bunko’ size novel, comes with furigana reading along with the kanji i.e. easier for Japanese language beginners or children to read)
Purchase @ Amazon JP
映画ノベライズ 斉木楠雄のΨ難 (JUMP j BOOKS)
JUMP j BOOKS ver. (same size as the comic book, and will be released on the same day as Vol. 23 of the manga)
Purchase @ Amazon JP