Sierra, a Duke's daughter who has been used by her greedy father and scorned as a "sacrificial daughter," has been struggling on without giving up. But just as the business she had been painstakingly preparing was about to take off, she is suddenly ordered to marry!? Her partner is Julian, a soldier rumored to be cold-hearted. Sierra, who wants to restart her business, and Julian, who hates women. The two, whose interests align, decide to conspire and aim for a divorce......! However, it seems there is a secret behind this marriage involving the Royal Family――?