Throughout history, the duty of preserving the balance between the opposing forces of Yin and Yang has fallen upon them. Situations of unrest often draw malevolent entities to perpetrate harm upon humans, prompting the divine beings to designate a defender, also called a guardian god, to rein in the surfeit of Yin. This tradition has endured, giving rise to adept individuals handpicked by the gods to vanquish spectral entities - Ghost Hunters.