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.

立石実郎（高倉健）は、東京で娘・亜紀（白島靖代）と二人暮らし。立石の妻・志津江（大原麗子）は、四年前に駆け落ちして行方不明だった。志津江が駆け落ちした相手は、立石が自殺を止めた菊川（杉浦直樹）で、菊川と志津江が暮らす北海道の田舎町に、建設予定のテーマパークの担当者として立石がやってくる。偶然、志津江の店の近くのビジネスホテルに投宿した立石に志津江は近づき、菊川は立石に近づくな、と命じるが…。