[First-person transmigration into a book + female demon lord villainess + dual female leads + equally matched powerhouses + mildly satisfying] The heroine was upset that the author had killed off the female villain in her favorite novel, turning her into a stepping stone for the male lead. She complained about the story, never imagining that this would force her to transmigrate into a book and become that very villainess. Determined to change her fate, she alters the original storyline and finds herself caught up in a series of events with the main cast...