Cinderella no Ane Desu ga, Fuhoni Nagara Ouji to Kekkon suru Koto ni Narimashita
I Am Cinderella's Sister, and I Am Unwillingly Marrying the Prince: Enjoying Life in the Royal Villa as the Substitute Crown Princess·シンデレラの姉ですが、不本意ながら王子と結婚することになりました
Cinderella refuses a marriage proposal from the crown prince and runs away with a magician, leaving her older sister Adelina to take her place. Adelina agrees to the arranged marriage, but she has no interest in the prince or romance. Her goal is to live comfortably at the royal villa, surrounded by her animals, while planning for a peaceful divorce and financial support. She is indifferent to the prince's potential relationships with others. However, the prince, who initially had no feelings for her, begins to develop some level of interest in Adelina.