Books (novels and essays) Domestic mystery The season of books and keys

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Domestic Mystery
This mystery is amazing! 2020 Domestic Edition 9th place
Jiro HORIKAWA is a high school second year member of the Library Committee. In the after-school library with few users, he is on duty with Shimon Matsukura, another member of the Library Committee. Matsukura, who is tall and has a good face, stands out, is cheerful and laughs well, but is moderate and sarcastic. One day, a senior female member who retired from the Library Committee came to see me. He asked me to find out the number of the key of the unopened safe left by his late grandfather. Two male high school students challenge the mystery brought to the library in six volumes.