Shiitagerare Reijou to Kegare Koushaku

She is to marry the "Duke of Kegare" in place of her sister.... Cathlite is born the eldest daughter of a countess, but is oppressed by her family and has a hard life. One day, her sister Celia receives an offer of marriage. The other man, Duke Gilcasius, is an eccentric and socially averse man, with a scarred face and a reputation as a "wounded duke". Celia adamantly refuses to marry him. However, her parents, blinded by money, decide to marry Cathrite instead of her.....?