The Dark History of the Reincarnated Villainess

"Dark Past," a novel blending romance, adventure, and fantasy, was penned in middle school by none other than Konoha Satou. It chronicles the life of Konoha, a count's daughter who falls in love with her knight. Unfortunately, Konoha's mother discovers the book, leading Konoha to flee her home, only to tragically die in a traffic accident. However, as Konoha reopens her eyes, she finds herself in the very world she created, but no longer as herself. Instead, she is now Iana, a character she originally designed as the ultimate villainess and Konoha's younger sister. How is it possible that Konoha has been reborn as her own sibling?