



A boy named Zatch Bell arrives at Kiyo Takamine's house and reveals that Kiyo's father sent him to train Kiyo. Zatch gives Kiyo a letter from his father which reveals that Kiyo's father found an amnesic Zatch unconscious in the forest and with him was a red book in a mysterious language. While arguing with Zatch, the book glows red and Zatch shoots lightning out of his mouth destroying Kiyo's wall. At school, Kiyo annoyed with Zatch's presence sends Zatch to the rooftop to deal with "bullies". Zatch finds Suzy Mizuno on the rooftop and coincidentally, also finds a bully. The bully proceeds to beat up Zatch. Kiyo intervenes but is also beaten. Later, a mysterious flying skateboarder named Eido comes from the sky and knocks out the bully by blasting wind with his hand. He then demands Suzy to be his girlfriend and attacks Kiyo and Zatch. Kiyo notices that a child like Zatch is the one using the wind techniques. Kiyo reads "Zaker" from Zatch's red book and Zatch fires lightning Eido, scaring them away. In the distance, a mysterious pair reveal the Mamodo battle has begun.

Kiyo is on the way to school with Zatch when they notice a lake has been frozen. Kiyo notices a man named Hosokawa holding a light blue book with a child named Reycom. On the way home, Kiyo notices Suzy on television in the middle of a bank robbery committed by Hosokawa. Kiyo, hesitant to help her, is persuaded by Zatch to save Suzy. Kiyo bikes there and he and Zatch are launched from a bike into the bank. Kiyo attempts to get Zatch to fire lightning by reading "Zaker" from Zatch's book but nothing occurs. Hosokawa demands Kiyo's book and threatens to shoot Suzy. Kiyo wanting to save Suzy, shouts "Zaker" and Zatch simultaneously fires lightning from his mouth causing Hosokawa and Reycom to fly out of the bank. At home, Kiyo realizes the book responds to the user's emotions. Kiyo realizes Zatch has become stronger and notices another page of Zatch's book has become read-able.

At school, the bank incident causes Kiyo to become popular with the students. On the way home, Kiyo and Zatch are attacked by Hosokawa and Reycom. Hosokawa reveals that he wants to use Zatch's powers for his own gain. In the midst of the battle, Kiyo is frozen to the ground. Hosokawa takes Kiyo's book but is unable to read it. Hosokawa grabs Zatch and attempts to fire a "Zaker" at Kiyo but nothing occurs. Kiyo realizes that only the people chosen to read the book are able to cast the spells. Zatch manages to retrieve the book and return it to Kiyo. Kiyo reads the second spell "Rashield" which summons an electric shield from the ground. The shield catches Reycom's icicles and reflects it back with the addition of lightning on the icicles towards him. One of the reflected ice shards comes in contact with Reycom's book causing it to burn. When the book is burned into ashes, Reycom disappears along with it.

Zatch realizes from the battle that he was the cause of the lightning attacks. The next day, Kiyo spots Zatch trying to boast about his ability to fire lightning. They get into an argument and Zatch runs away. Zatch later meets and befriends a dog which accompanies him to Kiyo's house. At home, Kiyo is visited by the mysterious pair from before. They reveal Zatch is a Mamodo from the Mamodo World and when the book of that Mamodo is burned, the Mamodo is sent back to the Mamodo world. It is also revealed that every thousand years, a Mamodo battle occurs and the last one remaining on Earth becomes the next Mamodo King. They then demand Kiyo to surrender his book saying it would only bring trouble. Zatch, overhearing this, leaves with the dog. He runs into a mysterious man who uses a spell revealing the dog was actually a Mamodo.

The mysterious man, Renji, reveals he is the book user of the dog Mamodo, Gofure. Zatch is unwilling to fight, believing he is a monster and Kiyo would be better off without him. The pair easily defeat Renji and burn his book. During the battle, the pair are revealed to be Sherry Belmont and Brago. Using "Gravirei", they demand Kiyo to surrender his book or be killed by the spell. Kiyo refuses saying Zatch is his friend who saved him and that he will repay the favour. The pair prepare to use their strongest spell, "Gigano Reis". Zatch happy Kiyo considers him a friend, regains the will to fight. Using "Zaker" they were able to cancel the Brago's spell but Kiyo losses consciousness in the blast. Sherry decides to spare Kiyo and Zatch and leave saying they shall return for Zatch's book one day.

Kiyo is hospitalized because of his wounds following the previous battle. A patient next to Kiyo in the hospital room is revealed to be a kid named Yuuta. Yuuta has been hospitalized longer than usual for a broken leg. When Kiyo tells Yuuta he will not heal if he does not eat, Yuuta steals Kiyo's book and threatens to burn it. Kiyo, Zatch, and Suzy search for Yuuta. When Zatch finds Yuuta, Yuuta pretends he lost the book and Zatch offers to look for it with him as they are friends now. Yuuta touched by Zatch's words leads Zatch to the book on the roof. Yuuta falls on his way down the roof but is saved by a "Zaker" which destroys the floor under Yuuta and causes him to full into a room full of pillows.

Zatch becomes friend with a strange-looking horse but the relationship is short-lived when the horse is launched into the sky by Zatch's bully. Kiyo takes Zatch and Suzy to a botanic garden when a Mamodo attacks everyone in the garden by strangling them with plant roots. Kiyo and Zatch manage to free everyone captured by the tree roots with "Zaker". As Kiyo and Zatch prepare to defeat the Mamodo and his book owner, they are unable to cast the spell "Zaker". The opponent reveals that the book uses energy from the human partner in order to use spells. Kiyo, using his desire to protect everyone, manages to unleash a "Rashield". "Rashield" reflects the Mamodo's attack back at towards the user and in the process the Mamodo's book is burned.

A mamodo named Kolulu meets her human partner, Lori, who takes her on as a little sister. When Lori reads a spell from her book, it causes Kolulu to transform into a berserker who wishes to destroy everything. Kolulu cuts down a pillar, causing a car accident before transforming back. Kiyo, seeing the event on the news, investigates the scene. In a nearby park, Lori reads the spell in order to save Kolulu from being run over by a truck. Kiyo and Zatch perceive Kolulu as a threat to bystanders and engage her in battle. Zatch, noticing that Lori and Kolulu are suffering, refuses to fight them. Zatch's words causes Lori to realize they are not a threat and stops Kolulu from killing Zatch. Kolulu changes back and realizing what has happened reveals that her berserk personality was placed inside her in order to force her to fight in the Mamodo battle. Kolulu asks Kiyo to burn her book and Zatch promises Kolulu he shall become a kind Mamodo king in order to prevent what happened to Kolulu from occurring again.

The next day, Kiyo finds out a new page has become readable, revealing the third spell. Kiyo and Zatch head to a deserted area to practise the third spell "Jikerdor". When cast, nothing occurs and after multiple tries, they decide to give up. On their way home, they are attacked by a Mamodo named Fein and his partner Sebe. Kiyo manages to lead them to an abandoned building to prevent anymore bystanders from becoming injured. The pair manage to overwhelm Kiyo and Zatch with their super-speed spells. Kiyo places his hope on the third spell and uses "Jikerdor" which causes the Mamodo Fein to become magnetized. With Fein's movements becoming restrained, Kiyo and Zatch are able to burn Fein's book. Kiyo wondering if all Mamodos are that powerful, tells Zatch he must become stronger.

Zatch is helped by a kind man named Shin. Kiyo, noticing that his partner Eshros is holding a mamodo book realizes that Shin is a Mamodo. After secretly following them, they realize that Eshros is actually the Mamodo and that the pair intend to destroy a school tomorrow. Zatch follows the pair believing Shin to be a good person and learns that Eshro is manipulating Shin by making him believe he is fulfilling his mother's dying wish of becoming a strong-willed person. The next day, Kiyo and Zatch are able to convince Shin that Eshro is manipulating him. Shin realizing his mother wanted him to be like Kiyo, uses his strongest spell to defeat Kiyo and Zatch. Shin then gives Kiyo his book to burn knowing that Eshro is a bad person that does not deserve to be king.

A Mamodo impersonates Kiyo after nailing him to the ceiling and attempts to get information out of Zatch for his book. After fooling Zatch and Suzy into believing he is Kiyo, Kiyo crashes down from the ceiling and the Mamodo reveals his true form. He reveals his name is Kanchome and his partner Parco Folgore came from Italy to defeat Zatch. Two hours later Folgore returns to combat Kiyo and Zatch. Using Poruk, Kanchome transforms into a cannon but it is revealed that his appearance changes but he is still incredibly weak. Kanchome unwilling to lose to Zatch manages to gain a new spell, "Koporuk" which causes him to shrink. Kiyo annoyed, sets up a trap with a frying pan and chocolate and using "Jikerdor" traps Kanchome to the pan. Kiyo decides to let Folgore and Kanchome leave with their book intact.

Sherry and Brago are in a forest searching for a Mamodo and its partner. While there, Sherry reminisces about the past. In the past, Sherry is going to congratulate her friend Koko when she finds that Koko's city is on fire. Searching the city, she finds Koko brainwashed by the Mamodo Zofis. In the present time, Sherry and Brago engage in battle with the Mamodo they were searching for. Just then Sherry collapses from exhaustion. Sherry dreams about the time Koko saved her when she tried to commit suicide and how Koko afterwards became her first and best friend. Sherry regains consciousness and uses her new spell "Ion Gravirei" to defeat the Mamodo pair. She collapses soon afterwards with a fever.

Eito and Hyde coincidentally find Kiyo and Zatch and wanting revenge, decides to follow them to school. Eito reminisces how he found Hyde's book and remembers how he wanted power after being bullied. Zatch finds the pair when he smells Eito's Yellowtail burger and a battle ensues. Hyde amazed at Zatch's progress flees with Eito. Eito decides to challenge Kiyo and Zatch again by holding Kiyo's friend's hostage in a water tower. Kiyo and Zatch gain the advantage during the battle. When Eito sees Hyde's determination to win, the book glows revealing a new spell. The spell collides with "Rashield" and in the explosion, Eito and Hyde make their escape.

Kiyo and Suzy are attending a concert performed by Megumi Oumi. Backstage Megumi and her Mamodo Tia are worried that Maruss, the Mamodo that has been tracking them down to burn their book, may come and disrupt the concert. During the concert, Zatch sneaks in through the back door and meets Tia. Shortly after, Maruss and his book partner appear and start to wreak havoc. Zatch protects her and asks her to bring his book owner Kiyo. Tia, believing Zatch would betray her when his book owner arrives, decides to bring Megumi instead. During the battle, Maruss knocks Megumi unconscious and prepares to burn their book. At that moment, Kiyo intercepts Maruss' attack with "Zaker".

Zatch battles with Maruss and gains the advantage. Tia, inspired by Zatch's courage, decides to help Zatch defeat Maruss. With Maruss defeated, Megumi and Tia prepare to battle Kiyo and Zatch. To their surprise, Kiyo and Zatch wish them well and leave. Tia asks Zatch why he does not fight them and he explains that Tia is a good person, and if she does become the winner of the Mamodo battles, she would be a good and kind ruler. Tia is glad there is someone in the battle she can trust besides Megumi and promises Zatch she will aim to be a kind ruler. Kiyo returns to the concert and notices that Megumi left a note in his pocket promising she will be the one to save Kiyo next time.

Kiyo comes home and finds a notice demanding Kiyo and Zatch to go to a warehouse for Suzy's life. Kiyo arrives and meets the enemy Mamodo, Robnos, and his book keeper. A battle ensues and Kiyo is at a disadvantage. During the course of the battle, Kiyo is about unravel Robnos' attacks; He realizes that Robnos' laser attacks are able to reflect off the walls and that there were actually two Robnos firing lasers. Using "Jikerdor" Kiyo pins one of the Robnos down. The two Robnos then fuses into one making "Zaker" infective against him. Kiyo manages to stab a pole into Robnos's head and with "Zaker" aimed at the pole, overloads the charger in Robnos' head. The pair defeated reveal that they never had Suzy and that a Mamodo that looks like Zatch was spotted in England.

Summer Break has begun for Kiyo but he has to fulfill promises he made to people; the promise to help perfect an invisible pitch, catch 500 fish, hunt for a dinosaur, and helping create contact with aliens. With Zatch's help, he is able to fulfil the promises quickly. The next day, Kiyo goes with his class on a camping trip and Zatch secretly follows him. After cooking curry with his friends, the camp ends in an explosion of fireworks. The next day, Suzy wins a trip to Hong Kong and Kiyo and Zatch are on plane on their way to England. Zatch's friend is seen stowed away on the plane heading to England.

In England, Zatch and Kiyo run into Kanchome who asks for their assistance in finding Folgore. Using Zatch's nose, they track down Folgore by his scent. During their search, Kiyo meets Suzy, Megumi, and Tia who happens to be in England too. Zatch's nose leads them to a candy shop, a flower shop, and a toy store. The search ends when they find Folgore at a hospital with Suzy. Kiyo thinking that Folgore groped Suzy like he did to the women in the stores he visited, proceeds to attack him with "Zaker". Folgore manages to outrun Kiyo and meets his appointment in the hospital where it is revealed Folgore was buying gifts for sick children. Kiyo, realizing that Folgore is a good person, tells him to make it to the end of the Mamodo battle. While heading to meet his father, Kiyo's luggage is stolen by a thief.

Zatch manages to catch the thief whose name is Kory. Kiyo seeing a wound on Kory's arm takes him along to Kiyo's father's university where a doctor can look at it. They enter Kiyo's father's office only to find it in shambles. Kiyo notices a flower on the ground and Kory reveals its a flower of the dark lord's. He reveals that a dark lord is residing in a castle and kidnaps people from the village when they do not meet his demands. Folgore soon arrives and accompanies Kiyo to the castle. Kiyo and Zatch manage to overcome the traps in the castle and reach the final room. Steng, the man living inside the caste, reveals his giant armoured Mamodo Baltro. Seemingly invincible, Kiyo realizes that the Mamodo's ability is to manipulate armor by using flowers and reveals the Mamodo is actually inside the giant armor. Steng reveals that he has Folgore and Kanchome hostage and if Kiyo attacks, he will kill them.

Steng demands Kiyo to surrender his book for Folgore and Kanchome's lives. Once he has the book, he reveals he has no intention of keeping that promise. Kory suddenly appears and steals Kiyo's book from Steng and while dodging Baltro's attacks, returns Kiyo's book. Folgore and Kanchome meanwhile manage to free themselves allowing Kiyo and Zatch to defeat Steng and Baltro. Kiyo questions Steng why his father was kidnapped, to which Steng replies he was paid to do so. The castle begins to collapse as Steng and Baltro make their escape. Kiyo, Zatch, and Kory manage to rescue everyone in the castle including Kiyo's father. Steng and Baltro while running away from the castle, meets the Mamodo who hired Steng. The Mamodo fires blue lightning and Baltro's book is burnt.

Zatch and Kiyo head towards the forest where Zatch was found. While crossing through a village, the villagers retreat in fear from Zatch's presence. On the way, they meet Megumi and Tia who reveal that they saw someone who looks like Zatch. In the forest, Zatch attracts snakes with his whistle but is saved by Professor Dartagnian in a fairy suit. Dartagnian reveals that he has been researching the forest since an explosion six months ago. Kiyo and Zatch investigate the site of the explosion. Once there, Zatch suddenly starts to glow gold and when he regains consciousness, regains his memory about his life in the forest. Zatch reveals that another Mamodo who looked like Zatch, attacked him and caused him to lose his memories. Dartagnian who was witnessed the golden light reveals that Kiyo's book was glowing also. Kiyo opens the book and realizes he can read the fourth spell.

While practising the fourth spell, Zatch and Kiyo meet a girl named Djem and her Mamodo partner Yopopo. Djem explains that Yopopo's dance is able to attract Mamodos and that Yopopo is trying to call the Mamodo Kikuropu and his book owner as they attacked Djem's family. After she finished explaining, Yopopo is missing and Djem realizes that Yopopo found Kikuropu. Yopopo tries to combat Kikuropu without spells but is defeated. He is saved by Kiyo and Zatch and they team up to combat Kikuropu. Zatch's "Zaker" proves ineffective and Kiyo tries the use the fourth spell "Bao Zakeruga" but nothing occurs. Yopopo's book is burnt in the midst of the battle and filled with emotions, Kiyo is able to use "Bao Zakeruga" which summons a giant electrical dragon and defeats Kikuropu. Djem tells Yopopo she loves him and cries as he disappears.

Kiyo's father shows Kiyo a stone tablet that features a Mamodo creature with demonic writings at the bottom and tells Kiyo to phone him if he finds out what the stone tablet is. Kiyo and Zatch return to Japan and while retrieving his baggage, Zatch finds his horse friend. The horse takes an instant dislike to Kiyo but accompanies them home. Kiyo realizes that the horse is a Mamodo when he finds its book. Angered by the Mamodo's attitude towards him, Kiyo kicks it out of his home. He is then pressured by his friends to find the horse. Kiyo finds the horse trying to find a book owner and Tio explains how lonely it was without a book owner during the Mamodo battles. Kiyo then decides to let the horse stay with him until he can find his book owner. Kiyo then names the horse Mamodo Ponygon.

After Zatch and Ponygon damage the gate in front of Kiyo's home, Kiyo goes to the store to buy supplies to fix it. While there, Suzy is almost hit by a car but is saved by a stranger and his Mamodo. Kiyo follows him and realizing that he's a good person, decides to avoid a battle. The stranger reveals that he knows Kiyo is a book owner. They talk and Kiyo learns that Apollo and his Mamodo is Rops have been avoiding battles whenever possible. Apollo becomes interested in Kiyo's story and challenges Kiyo to a battle. Apollo tells Kiyo to meet him in two hours with his Mamodo. Zatch when unable to fix the broken gate himself, runs away and wonders whether he should return to the Mamodo world as he is just a nuisance to Kiyo. Zatch meets Lori who reminds him of his goal to become a kind king. Kiyo finds Zatch and they begin their battle with Apollo. Apollo gains the upper hand when he knocks Kiyo's book out of his hands and threatens to burn it.