Shinda Akujo ni Shuuchaku Shinai de

Isabella, scorned as the "failure of an older sister" to her saint younger sister, lived a life getting mocked. One day, she met a young vagabond named Raven. Though they spent time together like family, Isabella’s dormant saintly powers suddenly awakened. Her sister, learning of this, set a trap, leading to Isabella's death. However, Isabella’s life rewinded returning her to a moment before her demise. And there she encountered Raven again, who is now the Emperor of the Empire, grown and emotionally hardened. “I will never love you,” he declared, indifferent to her now, with no memory of their shared past. Feeling unwanted, Isabella planned to resolve a particular issue and then leave him behind. But then… “Don’t go, Isabella.” “...Your Majesty?”

Original Webtoon

https://ebookjapan.yahoo.co.jp/books/885721/