In the past, it was bustling with coal mines, but due to the closure of the mine one after another, the city of Nupuka no Shiki in Hokkaido is currently suffering from depopulation. The mayor, Yamagata, is trying to revitalize the city by proceeding with the construction of the theme park "Tyrolean World" with capital participation from the Kanto Electric Railway in Tokyo.

Tateishi, the head of the engineering department of the Kanto Electric Railway, is assigned to Hokkaido, leaving his daughter Aki in Tokyo to be responsible for the construction and operation of Tyrolean World. There he meets Kikukawa, whom Tateishi had dissuaded from committing suicide in the past. Soon complicated triangle forms, beetwen Tateishi feeling responsible for Kikukawa, his wife and Kikukawa himself, trying run from the situation.