The upcoming anime film adaptation of Nowaki Fukamidori’s fantasy novel, “Whoever Steals This Book” (Kono Hon o Nusumu Mono wa), has released its main trailer, revealing a lineup of key cast members, additional staff, and the film’s theme song. The film is set to premiere in Japan on December 26, 2025.
The new trailer offers a glimpse into the animated world of Mikura Hall and the magical adventure awaiting protagonist Mifuyu Mikura, who despises books despite her family’s legacy as avid collectors.
New Cast Members Join the Literary Adventure
The newly announced main cast features both fresh talent and seasoned voice actors bringing the characters to life:
- Rin Kataoka as Mifuyu Mikura (voice acting debut)
- Sora Tamaki as Mashiro (voice acting debut)
- Nao Toyama as Hirune Mikura
- Junichi Suwabe as Ayumu Mikura
- Shizuka Ito as Keiko Yosano
- Shinba Tsuchiya as Takafumi Haruta
- Romi Park as Tamaki Mikura
Unveiling More Staff and Musical Talent
Beyond the cast, the latest reveal also confirmed the theme song and provided further details on the production team. The film’s theme song, titled “Share,” will be performed by YUKI. YUKI is known for her work on the opening theme for Dance Dance Danseur.
Previously announced staff include:
- Director: Daiki Fukuoka (known for Radiant series director and Danganronpa 3: The End of Hope’s Peak High School: Despair Arc)
- Screenplay: Yasuhiro Nakanishi (Kaguya-sama: Love is War, No Longer Allowed In Another World)
- Character Design & Chief Animation Director: Keiko Kurosawa (Astra Lost in Space, Asobi Asobase -workshop of fun-)
- Music: Michiru Ōshima (Fullmetal Alchemist, Little Witch Academia)
- Animation Studio: Kagokan
- Distributor: Kadokawa Animation
The Story of “Whoever Steals This Book”
The film adapts Nowaki Fukamidori’s novel, first published in October 2020 by Kadokawa Shoten. A manga adaptation by Kakeru Sora was serialized from December 2021 to March 2023. Yen Press licenses the manga in English.
The narrative centers on Mifuyu, a high school student who, despite her family’s deep connection to books and the famous Mikura Hall library, harbors a dislike for literature. However, her life takes an unexpected turn when a theft at Mikura Hall triggers an ancient curse. Mifuyu is then forced to retrieve the stolen books by entering the very stories she despises, embarking on a magical quest with the help of the enigmatic Mashiro. The film promises a fantasy mystery full of adventure as Mifuyu delves into cursed narratives to save her town.
The “Whoever Steals This Book” anime film is slated to hit Japanese theaters on December 26, 2025.
