Yaiba and his companions continue their journey across Japan in search of the legendary orbs. But when Yaiba uses the mysterious Dark Orb during a fierce battle with Goemon Ishikawa, he and Jubei are suddenly pulled into a world of darkness! Can they find their way back before it’s too late? Meanwhile, Onimaru has set up his base atop Mt. Fuji. When he learns about the dragon god’s orb, which is said to grant dominion over all, he plans to lure Yaiba and the others to the peak of the sacred mountain and take it from them!