Toshokan no Tensai Shoujo: Honzuki no Shinjin Kanri wa Boudai na Chishiki de Kuni wo Sukuimasu!

Meet Martina, a brilliant young girl with one all-consuming obsession: books. She’s already devoured every last volume in the commoners’ library, and the last place left with unread material is the royal library inside the palace itself. There’s just one tiny problem...only civil servants are allowed inside. Naturally, she does the only logical thing: aces the civil service exam and lands herself a job at the palace! But Martina’s dream of open access to books galore won’t come so easily. An unusual surge of monster attacks is threatening the kingdom, and the General Affairs Office where civil servants work stands at the epicenter of the resultant chaos. Loving the written word won’t be enough—this rookie will have to use her book smarts to travel the world and defeat powerful enemies if she wants a quiet life of reading. With a photographic memory and a brain like no other, Martina might just be the key to saving them all. (Source: J-Novel Club)