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Mifuyu and Mashiro as seen in the trailer.

The fantastical mystery novel gets a movie adaptation (Image: KAGOKAN).

“Whoever Steals This Book” novel gets anime movie adaptation for 2026

KAGOKAN is producing the anime film adaptation.

We have some great news for all anime movie lovers! The popular novel “Whoever Steals This Book” by Nowaki Fukamidori is getting a film adaptation in 2026. The new official website and X (formerly Twitter) account of the anime movie announced the news, along with a new key visual and short trailer. Unfortunately, the definitive release date hasn’t been revealed yet.

Whoever Steals This Book anime movie staff and other details

The film is yet to reveal its cast, as the trailer also doesn’t feature any voice roles. Produced by KAGOKAN, the movie is being directed  by Daiki Fukuoka. Yasuhiro Nakanishi is handling the screenplay while Keiko Kurosawa is listed as the character designer and chief animation director. Michiru Oshima is the music composer for the project.

The movie is being adapted from Nowaki Fukamidori’s novel which came out back in October 2020. A manga adaptation illustrated by Kakeru Sora was published in Kadokawa's Young Ace magazine from 2021 to 2023. Yen Press publishes the manga in English and describes the premise as:

Descended from a long line of book collectors, high school student Mifuyu is surrounded by books in every aspect of her life. Her great-grandfather established the famous Mikura Hall, a library in the heart of town, and even the townspeople are all avid readers. There’s just one problem—Mifuyu hates books! But when a thief in Mikura Hall triggers an ancient curse, she’s left with no choice but to reclaim the stolen books herself…by entering the very stories she despises! With the help of the mysterious Mashiro, will she be able to restore her great-grandfather’s collection and save her town from a magical doom?