Koichi lives with his mother and retired grandparents in Kagoshima, the southern part of Kyushu region. Separated by their parents’ divorce, his brother Ryunosuke lives with their father in Hakata in northern Kyushu. A new bullet train line in the region will be inaugurated soon, and Koichi starts to believe a “miracle” will happen the first moment these new bullet trains intersect each other from opposite directions with their highest speed; his only wish is for his family to live together once again. With some help from grown-ups around him, Koichi sets out on a journey with a group of friends, each hoping to witness a miracle.