The Dark History of the Reincarnated Villainess (転生悪女の黒歴史, Tensei Akujo no Kuro Rekishi) is a Japanese manga by Akiharu Tōka. It tells the story of Konoha Satou, who wrote a romantic fantasy novel called “Dark Past” in middle school. The novel is about Konoha, a count’s daughter who loves her knight. When Konoha’s mother discovers the novel, Konoha runs away, gets into a traffic accident, and dies. She wakes up in the world of her story as Iana, the younger sister of Konoha and the greatest villainess she had created. Therefore, she has been reincarnated as Konoha’s sister!