Ascendance of a Bookworm (Light Novel)
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Novel by Miya Kazuki, You Shiina | A young woman who loves books dies and is reborn in another world as Myne, a sickly child from a poor family. Worst of all, there are almost no books in this world! So Myne decides that she'll just have to make her own and become a librarian.

Rozemyne will take on even the gods themselves in her quest to rescue Ferdinand. She speeds to Ahrensbach faster than Steifebrise, and as the battle against Lanzenave commences, Georgine finally begins her invasion. To war!