わたくし、負けませんので。 政略結婚は令嬢のたしなみ, I Shall Not Lose. Political Marriage is a Lady’s Accomplishment,Watakushi, Makemasennode. Seiryaku Kekkon Ha Reijo No Tashinami

Annamaria, the "Black Magic Young Lady," and Rosalia, the "Silver Knight Young Lady." The two, who are both childhood friends and Rivals, one day meet Duke Jeremiah. Hearing rumors that he is searching for a bride, Annamaria, hiding her hidden motives, approaches him... but Rosalia is already there. To the two who were about to clash, Jeremiah confides a secret. "I want to marry the person who recovers the stolen Smeraldo." ──And so, the calculating and fateful Proposal Battle between the two young ladies begins!?