This world looks no different from the modern city you and I live in. High-rise buildings cut into the sky, subways run in the dark, and people rush for a living, spending their time in cubicles and commuting. The surface world follows the laws of steel and cement. Technology, order, and that reassuring mediocrity constitute the superficial logic of social operation. However, beneath this seemingly solid daily routine, there is a turbulent undercurrent called the "other world." There, the ancient "spirits" have never slept. They use modern cities as their nests and incarnate as "lost ones" - monsters eroded by their own out-of-control power or alien existence. They create unreasonable fear and disaster in late-night alleys, abandoned buildings, and even in the gaps between people.
