可愛い義妹が婚約破棄されたらしいので、今から「御礼」に参ります。

Roseliaは賢くて美しくて勇敢です。Roselia is smart, beautiful, and brave. She married her childhood friend and daughter-in-law, Robert, and became a member of the Duke of Phibert's family, where she lived happily ever after. Then one day, tragedy strikes the Phibert family. Margaret, Robert's younger sister, who was attending the school, had her engagement broken off by the crown prince, Oswald, and returned home after being severely beaten. She is as important to Roselia as if she were her own sister. She is as important to Roselia as her own sister, and she will not allow anyone to harm her lovely sister-in-law. As she investigates the case, she learns of the distorted state of the kingdom. She and her husband, Roberto, decide to put a plan into action. They are going to create a new country and take over the kingdom... A gorgeous revenge drama by the most powerful duke and duchess!