When her mother Kazuko is left comatose after a car accident, high-schooler Akira Yoshiyama uses her mother's research into time travel to journey back from 2010 to the 1970's. Akira believes that if she can bring her mother's first love back from the past, that he will be able to bring Kazuko back to consciousness and reunite mother and daughter. But as Akira finds herself falling for a young man that she meets in the past her future starts to become uncertain.

Like the enchanting 2006 animated feature film of the same name, this movie is inspired by - and a sequel of sorts to - the wildly popular Japanese sci-fi novel "Toki o Kakeru Shōjo" which also spawned several feature films, a manga and a TV drama series.