My Once-Enemy Sister Now Cherishes Me

Story

After a life of misfortune resulting in death at the hands of her sister, Calista, Harper wakes up again as her 8-year-old self. Realizing she's been given another chance at life, Harper is determined to stay out of the way and avoid becoming her sister's target. Unfortunately, her plan to go unnoticed goes awry when the sister who once hated her seems to be interested in her instead! But maybe this is for the better... if Harper can make Calista like her, she won't try to kill her, right?!

Synopsis via AniList (English).