Set in Hashima, Nagasaki Prefecture and modern Tokyo in 1955, when the coal industry was developing rapidly, it tells a grand story of love, friendship and family destiny spanning 70 years.

From a macro perspective, it tells the story of Japan's changes from the post-war revival period to a period of rapid economic growth, and from a micro perspective, it shows the fetters of family, the various aspects of the world, youth and love over the past seventy years.

At the same time, it is clearly pointed out that modern Japan has everything at first glance, but it is an era when young people have no dreams and looks for hope leading to the present from the past.