Two years ago, high schooler Kanae left his small island community of Sodeshima to pursue his academic dreams in Tokyo. When that life falls short of his expectations, he runs away from home to return to Sodeshima and his childhood friend, Akari. But before they can rekindle their old feelings for each other, the clock strikes six and Kanae finds himself inexplicably thrust forward four days into the future. Worse, he learns that Akito, Akari's older brother--and Kanae's childhood hero--is dead.