The Duke's Daughter's Mission to Seduce the Demon King～Humanity's final gambit: a political marriage with the Demon KIng!

Updated: July 16, 2026

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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！？～ / Kōshaku Reijō no Kōraku Misshon ~ Maō to no seiryaku kekkon ga, jinrui saigo no kirifuda desu!... tte, maō ga onna no ko no baai wa dō sureba ii no desu k ; Koushaku Reijou no Rouraku 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!?~ ; Koushaku Reijou no Kouraku Mission: Maou to no Seiryaku Kekkon ga, Jinrui Saigo no Kirifuda desu! ...tte, Maou ga Onnanoko no Baai wa Dousureba Ii no desu ka!? ; Koushaku Reijou no Kouraku Mission - Maou to no Seiryaku Kekkon ga, Jinrui Saigo no Kirifuda desu! ...tte, Maou ga Onnanoko no Baai wa Dousureba Ii no desu ka!?
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Action - Demons - Fantasy - Shounen - Yuri
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The Duke's Daughter's Mission to Seduce the Demon King～Humanity's final gambit: a political marriage with the Demon KIng! Rank: 3.2/5 - 16 Rating(s)

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Summary

Five demons launched a war against humanity, destroying more than half of its lands. Among them, the Demon King, who has killed more humans than any other, and a dukes daughter enter into a political marriage, bringing the war to a temporary ceasefire. Cecilia, the dukes daughter, sets out to win over and ensnare the Demon King, hoping to prevent the extinction of humanity. However, the Demon King is hiding a major secret?