The novel constructs a fantasy world that integrates modern cities with extraordinary powers. In this world, there are different levels such as the present realm, the borderland, and the underworld. There are also various extraordinary organizations and forces, like the Astronomical Society, Green Day, Golden Dawn, etc. These organizations and forces are constantly competing and wrestling with each other. Meanwhile, the world is faced with numerous crises and challenges, and the shadow of destruction looms over it all the time.