One summer day, Minami and Hideaki secretly visited a seaside guesthouse without telling their parents and confirmed their love for each other. However, a twist of fate tore them apart... Five years passed, and even though Minami had found a new lover, she was unable to let go of her feelings for Hideaki. She returned to the guesthouse and was reunited with the changed Hideaki... The gears of fate drew them back to summer, and time began to turn for the two of them.