Biblia Koshodō no Jiken Techō

Biblia Koshodō no Jiken Techō (ビブリア古書堂の事件手帖) is a Japanese light novel series written by En Mikami and illustrated by Hagu Koshijima. It began publication by ASCII Media Works' Media Works Bunko imprint in March 2011; ten volumes have been released. The novel has been adapted into two manga series, a television drama, and a live-action film.

Light novel
Written by En Mikami and illustrated by Hagu Koshijima, the light novel began publication by ASCII Media Works under their Media Works Bunko imprint on March 25, 2011. As of March 2022, ten volumes have been released.

Manga
A manga adaptation, illustrated by Nakano, began serialization in Kadokawa Shoten's magazine Altima Ace on February 18, 2012. In October 2012, Altima Ace ceased publication; the manga was transferred to Monthly Asuka. The series finished serialization in 2014, with its individual chapters being collected into six tankōbon volumes.

Another manga adaptation, illustrated by Ryō Kōda, began serialization in Kodansha's Good! Afternoon magazine on July 6, 2012. As of 2014, its individual chapters have been collected into three tankōbon volumes.

TV drama
A television drama adaptation aired on Fuji TV from January 14 to March 25, 2013. It starred Ayame Goriki and Akira. Crunchyroll released the series outside of Japan.

Film
A live-action film adaptation was announced on February 9, 2017. It was directed by Yukiko Mishima and starred Haru Kuroki and Shūhei Nomura. It was released on November 1, 2018.

An anime film adaptation was also announced on February 9, 2017.

Reception
The novel was nominated for Mystery Writers of Japan Award in the Novel category in 2012 and 2014. In 2012, it was nominated for the Japan Booksellers' Award.

The novel was the first work published under Media Works Bunko to sell one million copies. By June 2020, the series had sold seven million copies.