Grimoire Reference

is a Japanese light novel series written by Yosuke Saeki, with illustrations by Hnaagada. The series began publication on December 10, 2020 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The library of Uizu Gakuen, which boasts one of the largest collections of books in Japan, had a vast and profound "Underground Labyrinth".

One day, Takeshi Morisa, a library committee member belonging to the high school, steps into the closed stack library, which is off limits, and learns the truth hidden in this library. -The library committee members continue to challenge the endless labyrinth exploration in order to obtain strange books, rare books, and magic books with extraordinary powers stored underground.

Knowing the secret, Morisa decides to team up with another library committee member to perform an "underground reference" to search for an unknown collection in the labyrinth where the demons are scared. However, it was a fun and turbulent day-to-day dawn ...!?