Toshokan no Tensai Shoujo ~Hon Suki no Shinjin Kanri wa Boudaina Chishiki de Kuni o Sukuimasu!~

Martina loves books and has finally read every book in town, so she aims to become a government official in search of books from the undiscovered royal palace library. She takes on a highly challenging exam, but her incredible memory, never forgetting a single word of the book she reads, means she passes with a perfect score!? Assigned to the Political Affairs Department, Martina surprises those around her with her powerful memory, but one day, an unnatural monster appears...!?

https://www.cmoa.jp/title/332297/