'Biblia Used Bookstore Casebook') is a Japanese light novel series written by En Mikami and illustrated by Hagu Koshijima.

[2] A manga adaptation, illustrated by Nakano, began serialization in Kadokawa Shoten's magazine Altima Ace on February 18, 2012.

[3] In October 2012, Altima Ace ceased publication; the manga was transferred to Monthly Asuka.

[4] The series finished serialization in 2014, with its individual chapters being collected into six tankōbon volumes.

[5] Another manga adaptation, illustrated by Ryō Kōda, began serialization in Kodansha's Good!