Munou Saijo wa Akujo ni Naritai ~Gimai no Migawari de Totsuida Reijou, Koushaku-sama no Dekiai ni Kizukanai~

Avril is a young woman of exceptional ability who was mistreated and labeled \"incompetent\" by her family. Avril marries into the family of an \"old, lustful duke\" in place of her half-sister, but the duke, Dylan, is actually a beautiful young man who is the complete opposite of what he is rumored to be. He wants to marry a \"villainess,\" and a contractual divorce after three years is perfect for Avril\'s future freedom. The people around her are bewildered by the mysterious \"brilliant woman\" who plays the role of a \"villainess\" with gusto, but they are gradually drawn to her...