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 / Honzuki no Gekokujou: Shisho ni Naru Tame ni wa Shudan o Erandeiraremasen—Dai 4-bu: Kizokuin no Toshokan o Sukuitai! / Honzuki no Gekokujou: Shisho ni Naru Tame ni wa Shudan o Erandeiraremasen—Dai Yon-bu: Kizokuin no Toshokan o Sukuitai! / Honzuki no Gekokujou ~Shisho ni Naru Tame ni wa Shudan wo Erandeiraremasen~ Dai 4-bu - Kizokuin no Toshokan wo Sukuitai! / 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！」 / 爱书的下克上　第四部 / 책벌레의 하극상 제4부