As snow falls around Ahrensbach's castle, Ferdinand, soon to be married to the duchy's next archduchess, receives a concerning letter. Not only has Rozemyne been summoned by the royal family once again, but she is also being taken to the underground archive hidden beneath the Royal Academy's library. Even in her third year at the school, she's proving to be a constant source of headaches--and she doesn't help matters when she pulls an unexpected figure into her joint research! The stakes are then raised again when Lestilaut makes a surprising suggestion, leading her to participate in a bride-taking ditter match with Leidenschaft's spear at her side. Can Rozemyne defend her own hand in marriage in this installment of this biblio-fantasy? Also includes two new short stories and four-panel manga by You Shiina!