"Whoever Steals This Book" Anime Film Reveals Extended Cast and Cursed Worlds in Thrilling New Trailer

The anime feature film adaptation of Nowaki Fukamidori’s fantasy mystery novel, Whoever Steals This Book, has released a new trailer and confirmed six additional members for its voice cast. The film is scheduled for a Japanese theatrical release on December 26, 2025.

The narrative focuses on Mifuyu Mikura, a high school student residing in Mikura Hall, which houses her great-grandfather’s extensive library. Despite this literary environment, Mifuyu is indifferent to books. Her apathy is challenged when a significant theft occurs, inadvertently triggering a powerful, ancient curse. This spell instantly transforms her entire town into a surreal landscape, mirroring the dangerous and fantastical worlds contained within the stolen manuscripts. To resolve this crisis, Mifuyu must leave her ordinary life and embark on a dangerous mission, venturing directly into the cursed stories, guided by the enigmatic Mashiro.

Key Voice Cast Announced

The film features a notable vocal ensemble. Rin Kataoka voices the protagonist, Mifuyu Mikura, and Sora Tamaki plays her mysterious guide, Mashiro. The previously announced cast also includes Nao Tōyama (Hirune Mikura), Junichi Suwabe (Ayumu Mikura), and Romi Park (Tamaki Mikura).

The recently revealed additions further strengthen the cast. These seasoned performers include Yō Taichi, Makoto Koichi, Yumiri Hanamori, Hitomi Ueda, and Manaka Iwami. Furthermore, veteran voice actor Jun Fukuyama has been cast in the crucial role of a mysterious man, promising a complex performance within the film’s emotional framework.

Production Staff Details

The production is handled by the animation studio Kagokan (Kagome Company). Daiki Fukuoka directs the feature, working from a screenplay written by Yasuhiro Nakanishi, known for his work on Toilet-bound Hanako-kun. Keiko Kurosawa serves as both the character designer and chief animation director, establishing the visual identity of the merged realities. The musical score, composed by Michiru Oshima, is intended to enhance the film's suspenseful and enchanting atmosphere.

Supported by Kadokawa and working closely with the original author, this adaptation aims to provide a faithful and visually impressive transition from the source material to the screen. The new trailer effectively showcases the combination of fantasy and high-stakes mystery, highlighting the immersive worlds Mifuyu must navigate to recover the stolen texts and ultimately lift the curse.