...... decided to marry the "Duke of Kegare" as a substitute for his sister. Although she was born as the eldest daughter of a count's family, she is oppressed by her family and has a hard time. One day, the story of marriage comes to her sister, Celiaria. His opponent, Duke Zircasius, is bigoted, unsociable, has a scar on his face, and is shunned by the public as the "Duke of Kegare". Celiaria firmly refuses to marry. However, her parents, blinded by money, decide to marry Casslight instead of her ......! A fantasy love story drawn by the author of the blockbuster "Fortune Effect" that begins with a substitutionary marriage!