In 2010 pharmaceutical researcher Kazuko Yoshiyama (Narumi Yasuda) is injured in a car accident. Her daughter Akari (Riisa Naka) uses Kazuko’s newly completed time-travel potion to leap back in search of a mystery man from her mother’s past… but misjudges the date and arrives two years late, in the year 1974. There, she enlists the help of reluctant student filmmaker Ryota (Akiyoshi Nakao), in a race against time to find a man that nobody remembers.