Keiyakukon Shita Aite ga Oni Saishou deshita ga, Kono Tabi Saishoushitsu Sennin Hosakan ni Ninmei Sareta Jimi Bunkan (Hensouchuu) wa Watashi desu.
Working as my Tyrannical Chancellor Husband's Aide (While in Disguise!)·契約婚した相手が鬼宰相でしたが、この度宰相室専任補佐官に任命された地味文官（変装中）は私です。
Christine lives in a kingdom where the king's marriage to a commoner has popularized the idea of love-based unions, even allowing married individuals to pursue new relationships in the name of "true love." Frustrated by these shifting social norms, Christine meets Leon. To end her engagement with her unfaithful fiancé, she pretends with him that they have fallen in love, leading to the breakup. She is surprised to later discover that Leon is the chancellor.