Time Traveller (2010)

A girl travels back in time in order to save her dying mother in this Japanese sci-fi adventure directed by Masaaki Taniguchi. With her scientist mother Kazuko (Narumi Yasuda) in a coma after being knocked down in a car accident, high school student Akira Yoshiyama (Riisa Naka) decides to use her mother's research into time travel to journey back to the 1970s. Once there, Akira searches to find her mother's first true love and bring him back to the present, where she hopes his presence will bring Kazuko out of her coma. Unfortunately for Akira, she soon discovers that her presence in the past has unforeseen consequences for her future.