All of humanity is transported to a strange ocean world, struggling to survive in the stomach of a giant fish named the Illusionary Leviathan. Humans and the Illusionary Leviathan depend on each other, fighting together against huge harmful creatures in the stomach while searching for supply boxes to develop themselves. In this ocean world, creatures are abnormally huge, and even parasites far exceed human size, bringing extreme challenges to human survival. Because Zhou Wen can hear the voice of the Illusionary Leviathan, he has gained a unique advantage, leading humanity to find a way to survive in a crisis-ridden environment.