A certain island nation casually dumped nuclear wastewater, and then an earthquake and tsunami struck. A nuclear power plant exploded, and a biological laboratory was destroyed. The viruses and bacteria being cultivated there ran rampant, triggering a chain of disasters. Earth's environment gradually deteriorated. As humanity struggled to survive and adapt, Gu Hua'an met Duoduo, a spatial boundary stone who had transmigrated from another space-time. Brought together by fate, they formed a life-bound contract and began traveling through different space-times, accumulating merit.
