Synopsis

In the mountainous Nishiyoshino region of Nara Prefecture, a small family made up of Kōzō, the father, his wife Yasuyo, grandmother Sachiko, toddler Michiru, and her male cousin, Eisuke, live peacefully together. A railway is being constructed at which the father expects to be employed. He brings his nephew and daughter to the construction site and they explore the large cavernous tunnel through which the train is expected to pass.