Books (novels and essays) Domestic mystery Season of books and keys

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Domestic Mysteries
This mystery is amazing! It ranked 9 th in 2020 Domestic Mysteries
Jiro Horikawa is a second year high school librarian. In the after-school library where there are few patrons, he is on duty with Matsukura Shi-mon, who is also a librarian. Tall and good-looking Matsukura stands out and is cheerful and laughs well, but he is a nice guy who is moderately sarcastic. One day, a senior girl who retired from the librarian came to see me. She asked me to find out the number of the key to the unopened safe left by her late grandfather. Two male high school students challenge the mystery brought to the library in six volumes.