Two new short trailers and more additional cast members have been revealed for the upcoming Whoever Steals This Book anime film. The film is scheduled to premiere in Japan on December 26, 2025.
The five newly announced cast members include:
- • Shigeru Chiba as Junichirō Kaname
- • Ryota Suzuki as Tanbi Che
- • Reina Ueda as Natsume Harada
- • Tomokazu Seki as Osamu Kikuchida
- • Rie Takahashi as Shiori Haruta
©️2025 深緑野分／KADOKAWA／「この本を盗む者は」製作委員会
They join a previously announced voice cast that stars:
- • Rin Kataoka as Mifuyu Mikura
- • Sora Tamaki as Mashiro
- • 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
Daiki Fukuoka (Danganronpa 3: The End of Hope’s Peak High School, Yuki Yuna Is a Hero Season 2) is directing Whoever Steals This Book, with Yasuhiro Nakanishi (A Couple of Cuckoos series screenwriter) as scriptwriter, Keiko Kurosawa (Rumble Garanndoll) as character designer and animation director, Michiru Oshima (Anne Shirley) as music composer, and Yuji Higa (Kino’s Journey -the Beautiful World- the Animated Series production producer, Fate/Grand Carnival) as animation producer. Kagome Company (Kagokan) is in charge of the film’s animation production.
The anime film is based on the fantasy mystery novel by Nowaki Fukamidori, which was first published by Kadokawa Shoten in hardcover on October 8, 2020 and on paperback on June 13, 2023. A manga adaptation by Kakeru Sora was serialized between 2021 to 2023.
©️2025 深緑野分／KADOKAWA／「この本を盗む者は」製作委員会
Yen Press licensed the novel and manga adaptation for release in English, describing the main premise as:
Mifuyu is a high school student living with a large collection of books left by her great-grandfather — the vast library known as Mikura Hall. Although her father is the current caretaker, Mifuyu herself doesn’t share her family’s passion for literature. But when several books are stolen from the library, triggering an ancient curse, the town is transformed according to the stories within them—and the only way to put things right is for Mifuyu to catch the thief. With the help of a mysterious girl named Mashiro, Mifuyu sets out on an adventure through the different stories!
Sources: Whoever Steals This Book Official Twitter, KADOKAWAanime YouTube Channel, Anime News Network
