The Aso, a family of four, live in the old town of Nara. On the day of the Jizo Festival in the dizzying heat of midsummer, Kei, one of the Asos' twin boys suddenly disappears, as if he had been spirited away... For the family left behind, the flow of time stopped on that day. Five years later. Seventeen-year old Shun, the remaining twin, is a high school student, a member of