"Reincarnated as My Own Rival"

After a modern-day teenager dies, they are reincarnated as the villainous noblewoman, Liora Del'Aris, in their favorite fantasy novel. Now, instead of the protagonist, they must play the role of Liora, a character doomed to fall. To survive, they try to change Liora's fate using their knowledge of the original plot, but soon discover that the story is shifting in unpredictable ways. With new twists, a friendly protagonist, and a mysterious enemy, they must navigate a world where they can no longer trust what they thought they knew.