This is sort of a sequel and a prequel to the first book in the series, making that effectively a sequel within a sequel.
This is the story of the creation of the world. The first moments of creation, the forming of Pangaea, the fall of humanity, and finally the story of its redemption are told. Although many of my stories include Christian elements, I'm a syncretic, so this story will probably include some Buddhist or Shinto stories too.
But it also follows the story of Tamashii in her own quest.