In the far future, humans abandon the devastated Earth and move to the upper world “Tenjo”. But Tenjo and the law of causation collapse by a war and humans returns to the Earth, which has turns into an inhabitable planet except for Shinshu area. Shinshu is too small to accommodate all the humans, so they duplicate the area and create “Juso Sekai” in a parallel world. In order to rebuild Tenjo and the law of causation, the returned humans start reproduction of the history from B.C. 10,000. When the reproduction proceeds to A.D.