Honzuki No Gekokujou ~Shisho Ni Naru Tame Ni Wa Shudan Wo Erandeiraremasen~ Dai 4-Bu 「 Kizokuin No Toshokan Wo Sukuitai!」Honzuki no Gekokujou: Shisho ni Naru tame ni wa Shudan o Erandeiraremasen—Dai-4 Bu: Kizokuin no Toshokan o Sukuitai!; Ascendance of a Bookworm: I’ll do anything to become a librarian!—Part 4: I want to save the Royal Academy's library!; Honzuki no Gekokujou: Part 4; 本好きの下剋上　~司書になるためには手段を選んでいられません~　第四部　「貴族院の図書館を救いたい！」; Ascendance of a Bookworm: Part 4; การปฏิวัติของสาวน้อยหนอนหนังสือ; หนอนหนังสือยึดอำนาจ; Honzuki no Gekokujou: Shisho ni Naru tame ni wa Shudan o Erandeiraremasen—Daiyon Bu: Kizokuin no Toshokan o Sukuitai!; 本好きの下剋上　第四部

As Rozemyne wakes up after almost two years she finds out that the world around her has undergone great change causing her to feel like Urashima Tarō from the Japanese fairy tale. However, there is no time for her to get acclimate to the new world as she is quickly sent off to the Royal Academy to become a true noble. She is presented with the difficult task of raising Ehrenfest's ranking while being surrounded by eccentric teachers and children from other duchies however she is motivated by the Royal Academy's giant library. While there are no other Archduke Candidates or members of royalty around Rozemyne commandeers the library! Here begins Part 4 of this biblio-fantasy as we enter the Royal Academy!