Three hundred years ago, another identical world appeared upside down in the sky and robbed many water resources. The world fell and a new era began. I believe many people know the theory of parallel time and space, but no one knows that when two worlds appear in the same time and space, it also means that the number of people in the world has doubled, and resources are extremely scarce. Because of a joke played by God on all living beings, the two worlds were forced to start a war and rob each other of resources under the pressure of survival. After more than three hundred years of baptism of fire, the two worlds had deep grudges and hated each other. The world that has been robbed of water resources is called the earth realm, and the other is the water realm. The story begins in the year 301 of the New Era, when one day by chance, Su Yuan, a sixteen-year-old boy living in the slums of Jijie, met Su Lan, a machine girl from another world.
Concept: A story of mutual protection