The story follows an unambitious, introverted middle school student called Saike Kuzushiro. After witnessing the death of his childhood friend, Mikan Karatachi, in a road accident, he cries out to God. After a fall, Saike wakes up in bed the previous morning, the day of the accident.<br /><br />Will history repeat? Can he save Mikan? What power does he have to change the future?