ハズレ嫁は最強の天才公爵様と再婚しました。, Hazure Yome Ha Saikyo No Tensai Koshaku Sama to Saikon Shimashita.

Countess Ruelle had spent her life oppressed by her family, giving up on everything—until she finally married her childhood friend, Cain, and escaped her cruel household. But her hopes for a peaceful life are dashed when her new in-laws, calling her the “useless wife,” constantly belittle and mistreat her. Just as she perseveres for the sake of her beloved husband, Ruelle’s world shatters: Cain has been unfaithful with her own sister, Eleanor! Shaken by despair and anger, Ruelle accepts her divorce and vows revenge…