Ryouta Arata is an otaku who's just lost his job. In order to avoid becoming a NEET, he joins a PMSC, but little does he know the life of a mercenary is more grueling than he could ever imagine.
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.