Kiyomaro Takamine is a brilliant junior high student whose is a major target for teasing at school. So his father sends him a bizarre birthday present - a strange little boy named Gash and a mysterious red volume of spells. But there are more surprises to come, and Kiyomaro's destiny is about to change forever!

Kanchome, the mamodo partner of Italian singing sensation Parco Folgore (and Zatch's self-appointed rival), has gone and joined the circus. There he befriends a lonely girl named Rushka, but when a mamodo steals her flock of sheep, who will she turn to for help? Up until now, Kanchome has developed the reputation of being an uber-weakling... Can he muster up the strength to defend this young girl and defeat a really scary mamodo?

Life takes a turn for the fantastic when the enigmatic Dr. Riddles and his puppet-like partner, Kedo the mamodo, pop into town. Armed with an arsenal of baffling tricks and traps, Dr. Riddles forces Kiyo to question the very nature of his knowledge about both Zatch and his book. Do Zatch and Kiyo have enough strength to solve the doc's puzzles and learn a new spell at the same time?

During the course of their many battles, Zatch and Kiyo have chanced upon several mysterious stone tablets that closely resemble mamodo. As it turns out, during the last fight to determine the king of the mamodo 1,000 years ago, one mamodo had the power to freeze his competition in suspended animation. Now, someone has discovered a way to reanimate these stone tablets, and that spells mega-trouble for Kiyo and Zatch!

Newly arrived in the jungles of South America, Kiyo, Zatch and their friends dive into battle with Milordo-Z's cabal of revived 1,000-year-old mamodo. Though these ancient warriors boast frightening powers and spells, Zatch and Kanchome are reluctant to do harm to the mamodo and their brainwashed book owners. After all, it's the fiendish Milordo-Z's fault that they're even here in the first place. Can Zatch be victorious if he keeps holding back?

Zatch and Kiyo discover a valuable piece of information about how Milordo-Z's horde of revived 1,000-year-old mamodo are able to regain their terrifying powers. But their excitement is short-lived when their battle with these ancient warriors intensifies. Old friends Li-En and Dr. Riddles arrive with their mamodo to provide backup, but are they too late to help?

Italian singing sensation Parco Folgore and his mamodo partner Kanchome are in big trouble - they must amuse their current (and super-duper scary) mamodo opponent with an entertaining song-and-dance routine or face total annihilation! Will Parco and his timid companion pull off the showstopper to end all showstoppers, or has their luck finally run out? With a little help from the mysterious Dr. Riddles, they just might stay in the running to be king.

Back in the mamodo world, one name struck fear into the hearts of any and all who heard it: Brago. Now that the ultra-powerful Brago and his partner Sherry have confronted the diabolical Zofis, Zatch and his gang head off in search of the elusive "moonlight" - the supernatural power source that fuels Zofis's army. But will Zatch's self-proclaimed jilted girlfriend Penny stand in their way yet again?!

Things are looking bleak as Zatch and company struggle desperately against the gargantuan Demolt, the most ferocious mamodo in Zofis's private army. Zatch's ex-girlfriend from the mamodo world, Penny, decides to make the ultimate sacrifice, but will that be enough to ensure victory? And what's this? Is Zatch about to discover a new spell?

Kiyo just can't seem to shake the sneaking suspicion that he's being watched... because he is! Enter Koral Q, a robotic rival for the throne who claims to know all about Zatch's spells and their effects. Will Koral Q's reservoir of data on the mamodo world prove to be Zatch and Kiyo's undoing?

Ponygon, Zatch's equine mamodo buddy, needs to get to Hokkaido so he can meet up with his partner, the super-groovy Kafk Sunbeam. But awaiting them in this snow-swept landscape is an even more powerful horse-like mamodo who challenges Ponygon to a battle. Will the fire burning inside Ponygon's heart help him defeat his new opponent's devastating ice attacks?

Zatch is a demon child with magic powers that are unleashed by reading spells from a mysterious red book... and there are 99 other kids like Zatch who must fight to become the king of the demon world! As the battles wit the other little demons intensify, Kiyomaro's loyalty to Zatch is put to the test. And what will happen when the red book is stolen?