The story takes place in a distant future, when the activity of the continental plate gradually submerged most of Japan's territory, forcing people to build new cities on the sea. With the passage of time, the scale of maritime cities has become larger and the routes have become more complex. In order to maintain order, a type of people called "blue people"
The story takes place in a distant future, when the activity of the continental plate gradually submerged most of Japan's territory, forcing people to build new cities on the sea. With the passage of time, the scale of maritime cities has become larger and the routes have become more complex. In order to maintain order, a type of people called "blue people"