What Is It?
The 2006 Japanese-animated (anime) science fiction romance movie The Girl Who Leapt Through Time.
This is how The IMDb describes this anime movie:
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.
John Jr's Blog 