I'll Never Be Your Crown Princess! manga volume 1 features story by Saki Tsukigami and art by Natsu Kuroki.

Liddy, who was Japanese in her previous life, is now the daughter of a duke and engaged to marry the gorgeous Crown Prince Friedrich. Sounds like a dream come true—except this is a world that practices polygamy, and Liddy refuses to marry a man with multiple wives. To sabotage the engagement, she loses her virginity to a stranger, but that plan is thwarted by a surprising revelation. What will happen to Liddy next in this hot fantasy romance?