Zutaboro Reijou wa Ane no Moto Konyakusha ni Dekiai sareru

This is a wonderful, interesting japanese romance and manga series. It follows the story of Marie, who is a baron’s daughter but is treated like a servant. She is being misbehaved by her pretty Sister. It leads to a misunderstanding between them when Granado proposes to Anatasha. After an incident, Marie takes a places of her sister and leads to confusion. This is a web novel from 2019, and after a year, it became a light novel in 2020. In July 2025 adapted into manga and anime.