The Duke's Daughter's Mission To Seduce The Demon KingKoushaku Reijou no Kouraku Mission - Maou to no Seiryaku Kekkon ga, Jinrui Saigo no Kirifuda desu!... tte, Maou ga Onnanoko no Baai wa Dou sureba Ii no desu ka!? ; The Duke's Daughter's Mission to Seduce the Demon King, Humanity's Final Gambit: A Political Marriage with the Demon King! ...Hang On, But What am I Supposed to Do If the Demon King is a Girl!? ; 公爵令嬢の籠絡ミッション～魔王との政略結婚が、人類最後の切り札です！…って、魔王が女の子の場合はどうすればいいのですか！？～