Years after Kiyomaro Takamine and his demon partner Gash Bell won the tournament that crowned a new demon king, peace in the demon world collapses overnight. Three demon children uncover a hidden truth behind that outcome and make a desperate gamble, fleeing into the human world to search for the one partner who can turn their despair into hope. Kiyomaro, Gash, and old allies like Folgore and Brago are drawn back into the fight to protect what the last war built.