Tensei Akujo no Kuro Rekishi

In middle school Konoha Satou dreamed of escaping into a world like that of iDark Historyi a romantic fantasy novel she wrote telling the story of the counts daughter Konoha Magnolia and the knight she falls in love with Years later her mother rediscovers that novel only for Konoha to get hit in a traffic accident and die When she opens her eyes she finds herself in the world of her own creation as the heroines younger sister Iana Magnolia Somehow shes been reborn as the character she created to be the greatest villainess of all time