In the near future, the climate will warm, the glaciers will melt, and the last land mass will disappear, and the Earth will enter an ocean age. This catastrophic change reduced the population. In order to continue civilization, human beings started the "Merman project".

In the near future, the climate will warm, the glaciers will melt, and the last land mass will disappear, and the Earth will enter an ocean age. This catastrophic change reduced the population. In order to continue civilization, human beings started the "Merman project".