A 16-year-old boy, Hiroshi Kuzumi, has recently moved into a new town in the mountains. The town is separated into new and old streets by the river, and many mysterious local cultures still remain. Although confused and enjoying his new life, one person kept her distance from him: class committee member Kushinada Nemura. In their few encounters she gave him a word of advice: "Stay away from the old streets." (Source: MU)