So for now I'll leave you with a recommendation.
The Girl Who Leapt Through Time - This is one favorites and is a for sure buy.
Makoto Konno is a somewhat foolish and tomboyish high school student who spends most of her time hanging out with her two male friends. Things change one day when she suddenly gains to ability to leap through time! At first, she uses her newfound ability to do things such as preventing her sister from stealing her dessert, cheating on a test, and singing Karaoke for 10 hours. However, the small alterations she makes to the timeline turn out to have unforeseen consequences that snowball into dramatic and lethal situations for her and those around her.
Here is a trailer. Let's who you can watch this one. Most of you couldn't watch the Summer Wars one.