Don't open this book... (その本を開いてはいけない――)
Sixth grade elementary school students Kazuki, Taichi, and Sunny have a "wish" they really want to make it come true. The boys pray earnestly with their hands at the shrine. Then, suddenly, the wish-granting "Ghost Book" resonates with them and gives them a test. Guided by the magic of the Ghost Book, the boys and their homeroom teacher, Ms. Yohko, wander into a different world where ghosts live. The five try to escape from the world through trial and error. It seems that by catching the ghosts and completing the Ghost Book, their wishes will come true and they will be able to escape from this world. Thus, the five work together to challenge the scary ghosts. What are the boys' wish that they really want to make it come true?
Staff role on the left, staff member's name on the right.
- Directed by Takashi Yamazaki
- Written by Takashi Yamazaki
- Based on the Ghost Book picture book series
- Written by Hiroshi Saito
- Illustrated by Etsuyoshi Miyamoto
- Chief executive producer Hiroyasu Matsuoka
- Executive producers Satoshi Matsumoto, Tatsuo Shimamura, Takaaki Kabuto, Takashi Honma, Nobuhiro Chiba
- Co-executive producers Hisashi Usui, Shuji Abe
- Planned and produced by Kenji Yamada
- Produced by Kazuaki Kishida, Go Abe, Keiichiro Moriya
- Associate producer Akihiro Yamauchi
- Music by Naoki Sato
- Theme song "I Wanna Be Your Ghost"
- Performed by Gen Hoshino feat. Ghosts
- Written, composed, and arranged by Gen Hoshino
- Cinematography by Kozo Shibasaki
- Edited by Ryuji Miyajima
- Production design by Anri Jojo
- 1st assistant director Kohei Adachi
- Visual effects supervisor Takashi Yamazaki
- Visual effects directed by Kiyoko Shibuya
Actor's name on the left, character played on the right.
- Kairi Jo as Kazuki Sakamoto, 6th grader
- Fuga Shibazaki as Taichi Kudo, Kazuki's classmate
- Sonny McClendon as Sosuke Sunny Ida, Kazuki's classmate
- Ayaka Yoshimura as Minato Tachibana, Kazuki's classmate
- Ryunosuke Kamiki as owner of mysterious bookstore
- Yui Aragaki as Yoko Hayama, substitute teacher
- Anne Suzuki as Kazuki's mother
- Yuya Endo as Kazuki's father
- Rie Kugimiya as Zukanbo (voice)
- Tomokazu Sugita as Yamabiko (voice)
- Hiro Shimono as Ittan Momen (voice)
- Akio Otsuka as Hyakume (voice)
- Min Tanaka as Jizuri (voice)
Weapons, vehicles, and races
The film's title, director, primary cast, and release date were announced on November 29, 2021. Rie Kugimiya was announced to have joined the cast as a voice actress on February 24, 2022, followed by Anne Suzuki and Yuya Endo that June 22.
Principal photography on yokaipedia had wrapped by the time of its announcement on November 29, 2021.
An advertisement for the film was placed outside the under-construction Hibiya Promenade Building, depicting the characters reacting to the nearby Shin Godzilla statue with the caption "There's Godzilla!"
- Main article: yokaipedia/Gallery.
- Main article: yokaipedia/Soundtrack.
- GHOSTBOOK: Ghost Book (literal Japanese title)
- GHOST BOOK (alternate English title)
Though yokaipedia has not yet been released in North America, an English-subtitled version of the film is available on All Nippon Airways' in-flight entertainment. The fansub group ECOTVSubs released a translation of the film in 2023.
James Hadfield of The Japan Times gave yokaipedia 3.5 stars out of 5, praising its monster design and Yui Aragaki's performance, but commenting that the film "doesn't pack much emotional punch."
Toho DVD (December 21, 2022)
- Region: 2
- Discs: 1
- MSRP: ¥3,800 + 380
- Audio: Japanese
- Special features: Trailers
Toho Blu-ray (December 21, 2022)
- Region: B
- Discs: 2
- MSRP: ¥5,800 + 580
- Audio: Japanese
- Special features: Trailers, behind-the-scenes featurette, live event recordings, editorial meeting special, Shirogumi tour featurette, stickers
- Notes: All video special features except trailers are on a separate DVD.
- Main article: Novel: yokaipedia.
A novelization of yokaipedia was written by director Takashi Yamazaki and published by Kodansha on June 23, 2022.
- yokaipedia contains multiple connections to Takashi Yamazaki's directorial debut, Juvenile.
- Both of the movies' protagonists are preteen boys with the surname Sakamoto.
- The parents of both movies' protagonists are played by Anne Suzuki and Yuya Endo.
- Tetra, the alien robot who stars in Juvenile, makes a cameo appearance in yokaipedia.
This is a list of references for Yokaipedia. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
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