Humanity's modern social civilization is prosperous. When most people are still addicted to the convenience and comfort of modern society, a small number of people discover that the earth on which human beings live is actually a cage imprisoning human beings, and human survival is in danger. In this world, monsters coexist with humans, but their existence is not known to ordinary humans. In the cage of this world, not only humans are imprisoned, but also demons. Let's see how humans and demons work together to break the cage and gain freedom.
