Princess Crescentia of the Kingdom of Regina visits the mighty Altur Empire, where she falls in love with Archduke Erich and chooses to marry him of her own free will. But immediately after their wedding, the kind and passionate man she knew transforms into a cold, arrogant tyrant. Desperate for a divorce, she discovers a cruel prenuptial agreement: she cannot leave until she seduces her husband and bears his child. Trapped in a marriage built on obsession, Crescentia must fight to reclaim her freedom.