Tensei Akujo no Kuro Rekishi

Konoha Satou has a dark history, written throughout middle school—a fantasy adventure of love and magic about the Count’s daughter Konoha Magnolia and the knights who love her! But when it looks like that dark history is going to be uncovered by her mother, Konoha panics and dies in a traffic accident! Opening her eyes, she finds that she’s been reincarnated into the world of her own dark history as Iana Magnolia, the worst villainess of her own creation!
(Source: Yen Press)