Board Thread:Questions and Answers/@comment-74.64.64.78-20180603230222

I forgot The name of a song that I really liked,  it's been bothering me because I know it's on the more popular end of vocaloid songs  but I can't seem to find it. It's about this boy who has to go back in time to save his friend from death but every time he fails the day resets after doin to save his friend from death but every time he fails the day resets after doing this for years he realizes the only way to save her is to sacrifice himself  he throws himself in front of the truck that killed her in the first place. If you know the song please tell me it would be greatly appreciated. 