[Light novel] Book and key season (1 book)

the publisher:
Author: Hoshin Yonezawa
Size: 105mm x 148mm
Number of books: 1
Language: Japanese
Category: General books
Latest publication date: 2021-06-17

Synopsis:
Jiro Horikawa is a second year of high school books. In a library after school, where there are few users, he is on duty with the book committee member Matsukura Shimon.
Matsukura is tall and has a good face.
One day, a senior girl who retired from the book committee visited.
I want my deceased grandfather to find a safe that left the left, and I want you to find the key number.

The mystery brought to the library after school is a total of six boys challenged by two high school boys.
Refreshing and slightly bitter Hoshin Yonezawa's library mystery, opening!