Opal, a young earl's daughter who has just made her debut in society, has completely lost her reputation due to a certain incident. Despite the malicious rumors, she continues to reject suitors who are only interested in her substantial dowry, planning to inherit her maternal grandmother's estate when she turns twenty and live quietly in the countryside. However, on what was supposed to be her last season, her father orders her to marry the indebted Duke Hubert. Hubert, frustrated by having to sell himself to a 'loose woman' for money, treats Opal coldly. Moreover, in the duchess's room, there is even an 'angel' that is cherished by the household staff...