Have you ever wondered if, beneath the dazzling neon lights of the city, monsters from ancient myths lurk? Have you ever imagined that, atop the moon hanging high above humanity, gods stand watching over humankind? Have you ever wondered if, in the bustling modern city, extraordinary beings exist who walk among the earth in place of the gods? In human-ruled societies, countless mysteries lurk; in those forgotten, forbidden zones of life, ancient gods reside. Seraphim Michael, Hades, Poseidon… but where have the gods of Great Xia gone? In this world belonging to "humans," "mystery" must be eradicated!