Ana Ume Kekkon ~Kigen Tsuki Koushaku Fujin wa Kujikenai~

A young duke proposes a one-year contract marriage to Claire, the eldest daughter of a poor marquis family. Though surprised, she accepts and becomes a duchessonly to face bullying from the staff. But Claire, used to hardship from her own family, stands strong, solves problems, and slowly wins people over. As the duke watches her perseverance, he begins to fall for her. A slow-burn romance blooms from a fake marriage.