The story follows a 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 and after a fall, Saike wakes up in bed the previous morning, the day of the accident. Will history repeat? Can he save Mikan? What power does he have to change the future? <b>Included one-shots:</b> Volume 3: The Negatibrain