Honzuki no Gekokujou: Ferdinand no Yakata ni TeEl ascenso de un ratón de biblioteca: Haré lo que sea necesario para convertirme en bibliotecaria, “La mansión de Ferdinand"; Ascendance of a Bookworm: At Ferdinand’s Mansion; Honzuki no Gekokujou: Ferudinando no Yakata'nite; 本好きの下剋上　フェルディナンドの館にて

"Part 3 Spin-off". Ferdinand, the High Priest of the temple of Ehrenfest, has three trusted people: the knight Eckhart, the civil servant Justus, and his attendant Lasfam. They meet whenever the occasion arises and share all sorts of information. What follows is the true nature of these people, unfolding behind the scenes of the main story. Reading this will make you love the world of "Bookworms" even more! This is the start of a series of exquisite bibliophile fantasy stories told from the perspectives of three people who pledge their loyalty to Ferdinand