Mamoru Kanbe and CloverWorks Tackle a 15-Year-Old Mystery Favorite
The anime adaptation arrives with a full creative lineup already locked in. Mamoru Kanbe (The Promised Neverland) directs at CloverWorks (Spy x Family, Bocchi the Rock!), with Ayako Kurata serving as assistant director. Toshiya Ōno handles series composition, Jun Nakai takes on character design and chief animation director duties, and Takahiro Obata composes the music. The teaser PV, hosted on Aniplex's YouTube channel, already features clips from the anime itself — not just a visual reveal — along with the first voice samples from both leads.
Newcomer Riko Akechi (明智璃子) voices protagonist Shinokawa Shioriko, the bookshop owner at the heart of every case. In a comment published by Comic Natalie, Akechi described first discovering the novel on a spinning bookshelf in her middle school library and being captivated by the heroine's profile illustration. Landing the role after an audition, she called it nothing short of "a major incident" in her own life.
Shunsuke Takeuchi (Einar in Vinland Saga, Askin Nakk Le Vaar in Bleach: Thousand-Year Blood War) voices Goura Daisuke, the male lead. Takeuchi noted that the characters feel remarkably true-to-life and that Shioriko's passion for books made him want to pick up a novel himself.
What Is Biblia Koshodō no Jiken Techō?
For readers unfamiliar with the source material, Biblia Koshodō no Jiken Techō (ビブリア古書堂の事件手帖) is a mystery novel series by En Mikami, published under KADOKAWA's Media Works Bunko imprint with illustrations by Hagu Koshijima. The series centers on Biblia Koshodō, an antiquarian bookshop whose owner, Shinokawa Shioriko, has an extraordinary passion for books. When customers arrive carrying old volumes — and personal secrets — Shioriko reads between the lines to unravel the mysteries hidden within.
The franchise is no newcomer to adaptation. A live-action TV drama aired in 2013, followed by a theatrical film in 2018. But the anime marks a first for a series that has now surpassed 8.5 million copies in print and is celebrating 15 years since its debut volume. Original author En Mikami admitted he had quietly hoped for an anime but figured it would take extraordinary luck. Series composition writer Toshiya Ōno, who had known the title by reputation but never read it, said that diving into the novels evoked a nostalgia so deep it crossed into melancholy — a tone he wants to preserve in the adaptation.
Director Mamoru Kanbe offered a more personal reflection, comparing his love of vintage camera lenses — imperfect, with dark edges and soft blurs — to the kind of beauty found in old things that don't perform perfectly but carry irreplaceable character. It's a fitting philosophy for a series about the hidden stories inside weathered books.
Looking Ahead
The anime is confirmed for 2027, though no specific season or premiere month has been announced. With the teaser PV already debuting on Aniplex's channel and production clearly underway at CloverWorks, more details — a premiere window, episode count, and key visual updates — will likely surface in the coming months.
On the international front, Aniplex's involvement is a strong signal for global distribution. Aniplex of America has a track record of bringing CloverWorks titles to Western platforms, and the studio's recent output has consistently landed on Crunchyroll. No international streaming partner has been officially confirmed yet, but fans outside Japan have good reason to expect accessibility. As for the source novels, no official English-language release has been announced to date — English-speaking readers will want to keep an eye on KADOKAWA's licensing moves as the anime's premiere approaches.