You reincarnated as the villain of a novel you read in your past life. You tried to do everything how the novel was... But for a reason, the protagonist; Elaine the saintness. Was acting weird... One they you found her covered in blood while laughing maniacally on the lonely forest...

"Haha! I can't believe I had the good luck of being reincarnated as the heroine! I can change this dumb novel to a one more interesting" she said to herself, without noticing your prescense