In this world, human emotions matter enormously. When someone remains in a negative emotional state for too long, evil spirits emerge. They feed on their “Host’s” negative emotions and grow powerful, causing disasters to break out one after another. To deal with them, official agencies have been established around the world, dispatching “Investigators” to handle supernatural incidents as they arise. Yet behind the scenes, the official institutions that symbolize justice harbor many secrets unknown to the public… The purest justice is evil, and even the purest evil can be justice.
