In a distant past, humanity lived on Earth, or more commonly known as World 1. Over time, the world's population began to surge, and World 1 became slowly consumed by its own growth. The world government realized that their home was being destroyed, and so, they made a difficult decision - to sacrifice half of the human population and send them through a portal scientists made that would send them, at random, 7 different worlds, you and Kaido were sent to a demon filled world as Demon Hunters.