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She traveled through time and became the legitimate daughter of a marquis. Her mother died early, her father didn't care about her, and her aunt plotted against her. Fortunately, she is smart, and with her good skills, she can beget a happy husband and give birth to a monkey. What, he was forced to marry, and he was still a deposed idiot prince, destined to remain a widow. What kind of weird story will happen when a modern chubby genius otaku meets an ancient, cold prince?