The Demon King Malthus, who once trampled the Nine Kingdoms and made the gods fearful, was killed in the final decisive battle with the brave man at the cost of his soul being detonated. However, death is not the end - his soul was reborn in the body of the "Goblin", the lowest creature in the other world, and became a "waste" expelled by the tribe due to blockage of the magic circuit.
Concept: Another world