高中生芳山光（仲里衣纱 饰）已成年，但是在她的脑海里，父亲长谷川政道的印象只是儿时分别的背影。身为电影摄影师的他总是很忙碌，似空中飞人，芳山光唯有与母亲芳山和子（安田成美 饰）为伴。因为在大学药学研究工作取得了成果，母女俩的生活出现了转机。然而，不幸接踵而至。和子遭遇车祸，昏迷中留下一句“回到过去，再见一面深町一夫”。光决定帮母亲实现心愿，于是她利用母亲开发的药物，穿越时空回到了70年代。但由于技术失误，光把时间搞错了，回到了1974年而非1972年，所以寻不到一夫的线索。无奈之下，她只得求助偶然遇见的大学生凉太（中尾明庆 饰），后者陪她一起寻找一夫。在凉太的狭小公寓里，光协助他完成电影梦想，而后者却渐渐爱上了她……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.