Thirty years after the Hero sealed the Demon King, the world had regained peace... or so it seemed. Under the Hero's leadership, the structure of society changed, and a heinous rule by humans that discriminates against "Demi-humans" such as "Dwarfs," "Elves," and "Ogres" was being carried out. Demi-humans are treated as slaves and spend their days with their dignity trampled upon. In such a situation, the Demon King broke the seal and achieved a resurrection—! The grand counterattack of the Demi-humans begins now!!