Returner

A woman named Milly, who is currently living in the year 2084, gets into a time portal and is transported back to the year 2002. Milly has a mission while being in the year 2002, and it's to kill a Daggra, who has her home land almost extinct. If Milly can kill the first Daggra, then she will save her whole planet, and everybody will be free. The time portal lands Milly in Japan, and she gets shot in the head by a gunman. Milly didn't die because she has a metal plate in her head, so the gunshot did not harm her.

The gunman is now forced to help Milly find the present Daggra or she will kill him. Milly and the gunman get help from his friend and they find where the Daggra ship landed. Once Milly finally tracks down the Daggra, but she can't kill it.