The Girl Who Leapt Through Time

A high-school girl named Makoto acquires the power to travel back in time, and decides to use it for her own personal benefits. Little does she know that she is affecting the lives of others just as much as she is her own.
When 17-year-old Makoto Konno gains the ability to, quite literally, "leap" backwards through time, she immediately sets about improving her grades and preventing personal mishaps. However, she soon realises that changing the past isn't as simple as it seems, and eventually, will have to rely on her new powers to shape the future of herself and her friends.