The Dancing Mamodo

Kiyo and Zatch are practicing the fourth spell when suddenly they hear someone singing a song in the distance. Approaching the voice, they find a little boy named Yopopo in a green outfit dancing to the song. When Zatch playfully starts imitating the dance, a girl named Djem appears. Though at first she assumes (correctly) that Zatch is a mamodo and attacks him, seeing Kiyo makes her think she is mistaken, and she invites Kiyo and Zatch, and Suzy for lunch.

Zatch, Kiyo, Hyde, Suzy, Eido, Reycom, Hosokawa, Brago, Sherry, Sugino, Haru, Kolulu, Lori, Zofi, Koko, Shinichi, Gofure, Kiyo's Mum, Tia, Djem, British Gent, Dr. Riddles, Kane, Iwajima, Gustav, Wonrei, Oram, Kiyo's Dad, Baltro, Megumi, Kanchome, Kory, Danny, Yopopo, Cut 'n' Paste, Kikuropu, Yuuta, Hirofume, Grisor, Eshroth, Mr. Goldo, Robnos, Steng, Fein, Rembrant, Zoboron, Naomi, Marylou, Marie, Nana Baba, Maruss, Shion, Kiddo, Hideaki, Praying Mantis Joe, Rikku, Professor Dartangnan, Teacher, Kidnapper, Bari, Folgore, Ponygon, Yamanaka, Renji, Sebe, Periko

Every thousand years, hundreds of Mamodos descend upon Earth to take part in an epic battle to be crowned "King of the Mamodo World." Each one possesses a book of spells that can be read only by a human. When a Mamodo teams up with a human partner and a spell is read out loud, the spell book unleashes incredible powers- but if their spell book is destroyed, the Mamodo disintegrates and returns to their world in defeat.