Terranigma tells the story of the Earth's resurrection by the hands of a boy named Ark, and its progress from the evolution of life to the present day.
In Terranigma, the planet (a fictional Earth) is portrayed as a hollow sphere that has both an external and internal face. Since the beginning of the Earth, the external Lightside, the surface world, stood for growth whereas the internal Darkside, the under world, represented decline. Over the course of billions of years, these two forces came to be called God and Devil. Regardless of this inner antagonism, rapid progress took root and primitive life forms evolved to plants, animals, and humans. Technology and industry further expanded civilization, but the fight between God and the Devil was still taking place, more fiercely than ever. The conflict culminated in a final battle in Antarctica, on the surface world. However, neither of the two forces were victorious. The continents of the surface world submerged into the sea and the under world was sealed away.