A giant castle in a mysterious world. Two shady Majin, Gomah and Degesu, watch a monitor. The monitor shows Goku and the others having a fierce battle against Majin Buu. Gomah and Degesu head to Earth to execute a certain conspiracy.

Goku, Supreme Kai, and Glorio head out to the "Demon Realm" first. Their plane travels through space and a mysterious dimension. They arrive at the entrance to the Demon Realm, the "Third Demon World"!

Rumors of what Goku did in the Third Demon World spread across the Demon Realm. To avoid trouble, Goku wears a disguise at the hotel, but they can't let their guard down in the Third Demon World. Thieves see through his disguise!

Goku and his companions face off with Arinsu. With everything on the line, their battle begins. But all of a sudden, a transformed King Gomah stands before both parties!