転生公女は今さら傷つかない 姉の婚約者に嫌われていると思ったのに、溺愛されているようです? (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: Why do I have to hide my true identity and marry an evil duchess, but I'm still being doted on?　Yurika wakes up and finds herself reincarnated as Lillicotte, a princess of the Duchy of Monsira. As a substitute for her twin sister, she married her sister's fiancé, His Royal Highness the Dauphin Aquila, but the room where she lives is haunted!　She is treated coldly because of her sister, who is known to be an evil princess, and it seems...