In the future, Earth's water sources have dried up. A nuclear war over water resources erupts, and humanity loses its ability to reproduce. Survivors flee Earth one after another. The last human child, Long Yi, and her single father, Long Ke, struggle to survive in the desert by scavenging for remaining water. The arrival of an alien species marks the countdown to Earth's destruction. Facing a hopeless situation, how will the father and daughter find a glimmer of hope for survival...