Set five years following the events of 'Akuma-kun Sennen Oukoku,' this special chapter delves into the saga of the late Akuma-kun seizing control of the underworld beasts. Empowered by his infernal allies, Akuma-kun endeavors to merge the realms of humans and demons, sparking resistance from the mortal realm. In a grand showdown, Kitaro rallies Japan's Yokai to thwart Akuma-kun's ambitions and save both worlds from impending chaos.