Time, Past, Future, love, film maker, director, promise
Story plot:
In 2010, Kazuko Yoshiyama (Narumi Yasuda) works as a pharmaceutical researcher secretly developing a formula for time travel. After a car accident, she is left comatose. She briefly regains consciousness and tells her daughter Akari to travel back in time to 1972 and deliver a message to her first love, Kazuo Fukamachi (Kanji Ishimaru). She mistakenly travels to 1974 and befriends Ryota Mizorogi (Akiyoshi Nakao), who lets her stay in his apartment until she can return to her time.
Ryota aspires to be a famous director, and Akari helps film a movie with him during the time they spend together. The two place a personal ad for Kazuo to meet them in the lab Akari first appeared in, but when the previously dictated time and date for the meeting comes, Ryota is too caught up in grief over his father's sudden death to appear. Akari delivers the message to Kazuo, saying that her mother remembers the promise he made to visit her in the future. Kazuo tells Akari of his history with her mother. Kazuko had met Kazuo in the middle school science lab and accidentally inhaled the fumes of his time travel formula, allowing her to time-jump brief amounts of time. He erased her memory of him, and plans to do the same to Akari.
Akari asks to say goodbye to Ryota, who does not know when she is going back to her time. Ryota bids Akari farewell in misunderstanding, as he is leaving for a day trip. He gives Akari the soundless movie film to keep. Akari realizes too late that Ryota is going on a bus that will famously crash off a cliff and kill all passengers, and rushes off to save him, but Kazuo stops her from changing the past and erases her memory of both himself and Ryota.
She returns home to her mother being awake and well, and finds the film, which she has no conscious memories of receiving. Upon viewing, she cries but does not know the reason. Akari walks off into the cherry blossom trees in the same way she did in Ryota's movie.