Keikoku Akujo no Yarinaoshi Oujotan

Princess Sophia, the villainess who tilted the country and staged a coup d'état, ended her life with a cup of poison — or so she thought. When she woke up, she was looped back to five years ago! Starting over from the age of fourteen?! In order to avoid her execution, she decided to be a good person in her second life! Then, a serious knight protector did his best to protect her. But don't get carried away. She was the cause of his death the first time!