The town of Magoicho, a snowy town located in the mountains of Niigata Prefecture, is on the border of the prefecture, so it takes 45 minutes by bus to get to the nearest train station, and there are no convenience stores. In this small snowy town, Fuka Igarashi, a first-year high school student, leads a perfectly normal life with her grandparents and parents. One day, she returns home from school to find her cousins Kenshin and Yukie, whom she did not even know existed, from Kanagawa Prefecture.