There is not only one world, but many worlds existing at the same time. Each world has its own different development path. But the same cause brings similar results, but a small accident is enough to make one world different from another - that is, a parallel world! In one parallel world, the Z warriors may have saved the earth, but in another parallel world, the earth may have been destroyed... By chance, the Z warriors learned that the world they were in was the "Thirteenth World"! And a powerful enemy is approaching their world! This time the Z warriors are about to face enemies from another world...
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.
