Julius was taken prisoner as her younger sister. She had been dressed as a man all her life, and her younger sister left a will to live normally. Wear a pretty dress, meet a good man, have a lovely child, be happy……. ‘In other words, wear a dress, meet a man, have a baby.’ According to her sister’s instructions, she will marry into a marriage set by the enemy imperial family. Not surprisingly, the assassins come to the wedding night without a groom. It turns out her husband is Theo Astolf, the enemy who destroyed his country? …Well, he won’t even recognize it anyway. “I want a woman who can survive by my side until the end.” “I need a husband who can give me a child.” “…What?” “Baby, There’s no way to make it by myself. Can you help me?” “…….” The moment when the interests of a woman who doesn’t know what’s normal and a man who’s never been ordinary coincide. “…Huh, yeah! It tickles.” “That sounds good. Can I continue?” “Ah! Archduke, I, uh…….” A romance that they didn’t even know began.