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.

Apollo allows Kiyo to retrieve his book and warns Kiyo he will not hesitate to burn his book. Kiyo attempts to use "Bao Zakeruga" but nothing occurs once again. Kiyo begins to lose hope but Zatch's word return Kiyo's confidence. When Rops is hit by "Zaker", Zatch asks him what kind of king he will be and Rops shows his scarf to Apollo in reply. Apollo reminisces the origin of the scarf and the time his first meeting with Rops; a country has closed itself off from the outside and Apollo who is travelling the world is unable to leave. Apollo meets some kids who are taking care of Rops and asks them for directions out of the country. Apollo led by kids of the village lead him to the country's boarder but a gate blocks the exit. Rops' book glows and the kids give Apollo the book. When Apollo reads a spell, Rops is able to bring Apollo over the gate. The kids decide to give Apollo Rops and gives him a scarf. Apollo realizes that Rops wishes to be a king of freedom and uses his strongest spell against Kiyo. Kiyo counters with "Bao Zakeruga" and they both become immovable due to exhaustion. That evening, Apollo continues his travels around the world.

Zatch is out playing when Naomi chases him down and steals his lunch. Zatch distraught over the loss is comforted by a giant old woman. The woman reveals her name to be Nana Boba and proceeds to tell Zatch she is searching for the Hiromi, the soon to be wife of her son. Zatch volunteers to help her and suggests searching her son's house. There, Zatch catches Hiromi's scent and tracks her down. Zatch asks Nana what if Hiromi was someone who wore cheap jewelry and a short skirt, she would beat her up. Zatch spots Hiromi and tells Nana. He then notices the jewelry and short skirt, tries to hold Nana back. When Hiromi enters a bus, Nana runs after it and Zatch tries to stop her. Zatch soon crashes into the bus when it suddenly stops and loses consciousness. When awaken, Zatch sees Nana give Hiromi her old wedding ring and wishes her well. Zatch realizes that Nana was joking about her threat and that she knew her son would choose a good wife.

A Shemira sculpture is coming to the museum and to describe art to Zatch, Kiyo tells him to imagine a delicious yellow-tail. Meanwhile, A Mamodo named Danny and his book owner Mr. Goldo are delivering the sculpture. Danny meets Zatch while buying fish and fights him thinking Zatch is after his book. Danny stops when Zatch tells him he is at the museum to see the Shemira sculpture. Danny decides show Zatch the sculpture and returns to Mr. Goldo only to find out the sculpture has been stolen by a gang. Zatch follows them through their scent and leads them to a ship. Zatch then gives Ponygon a memo to give to Kiyo. Zatch, Danny, and Mr. Goldo infiltrate the ship. Mr. Goldo is held hostage by the gang but Kiyo arrives and saves him with Zatch's "Zaker". Once the gang has been apprehended the gang leader attempts to use a truck to escape. He crashes and the cargo falls into the car containing Danny's book and the Shemira sculpture. Danny manages to hold up the cargo and asks Zatch to destroy it. Zatch does so and the sculpture is saved but Danny's book is burnt. Before disappearing, Mr. Goldo heals Danny with the spell book and congratulates Danny on a job well done.

Kiyo, Zatch, Megumi, and Tia made an appointment at go to an amusement park. On the way there, Megumi and Tio enter a clothes shop and meet a person named Maryl Caruno who asks Megumi if they can trade clothes for a while. Megumi agrees and after the trade, Maryl leaves with Megumi's wallet and book. Megumi chases her but is stopped by a butler who reveals Maryl recently became queen and that assassins are after her. They search for her but Megumi is captured by the assassins who mistook her for the queen. Tia finds Maryl and tells her what has happened to Megumi. Maryl decides to risk her life to save Megumi, but is saved by Tia. The assassins were then captured and Maryl thanks Tia for her help.

Zatch and Kiyo enter the amusement park. Meanwhile, two Mamodos and their human partner reminisce on how they became allies. Outside, the Mamodo decides to destroy an amusement park ride but is interrupted by Zatch's "Zaker". Kiyo leads the enemy to an empty part of the park. The pairs Lupa and Purio and Hige and Zoboron overpower Kiyo with their teamwork. Kiyo in the midst of the battle, tells Zatch to fire "Zaker" into the sky. As Kiyo and Zatch are about to be defeated, they are saved by Megumi and Tia's "Ma Seshield".

Zatch is still paralysed by Purio's poison gas attack. With Tia managing to hold off the attacks, Kiyo gets an idea. Using Purio's slime as glue, Kiyo attaches Zatch to Tia's back allowing Zatch to move and attack. They manage to defeat and burn Zoboron's book. Purio who gains a new spell, uses it to create a smokescreen and escapes. Kiyo, Zatch, Megumi, and Tia spend the rest return to the amusement park. Kiyo asks Tia what Zatch was like in the Mamodo world and Tia replies that she does not know Zatch's family. Later, Megumi takes Kiyo with her to leave Tia and Zatch alone to allow Tia to give Zatch a bentō she made for him. They continue to spend the rest of the day at the park.

Zatch finds a fragment of a mirror while diving for yellowtail. Kiyo and Zatch befriends a new transfer student, Shion and her cat Nya. Soon they are attacked by a Man and his Mamodo, Cut and Paste, who demands Zatch's mirror piece. "Zaker" proves ineffective against him as it gets redirected by Cut and Paste's scissors and "Rashield" is too weak Cut and Paste's attacks. Cut and Paste use their strongest spell to summon a giant scissor missile. Kiyo and Zatch manage to defeat them by redirecting the scissor towards Cut and Paste with "Jikerdor". In the distance, a mysterious Mamodo pair observe Kiyo and Zatch. Shion with a dark expression asks Zatch if she could have the mirror.

Shion and Nya plan to steal the mirror from Zatch. After many failed attempts, Shion decides she must force Zatch into combat to steal the mirror from him. She takes Zatch to a forest and reveals that Nya is a Mamodo. She then proceeds to attack Zatch for the mirror but is saved by Kiyo's timely arrival. During the battle, Shion reveals that her parents died six months ago and that she wants the mirror in order for Nya to stay with her forever. She reveals a mysterious man told her that if all three pieces of the mirror were gathered, she can be with Nya forever. Zatch decides not to fight Shion and tells her they do not need to fight and that they can trust each other. Zatch then willingly gives her the mirror and Shion accepts.

Kiyo and Zatch accompany Shion to meet a mamodo named Grisor. Grisor reveals that the demonic mirror has the ability to free a person from the Mamodo battles. He explains that the mirrors must be gathered in a mystical ruin nearby. Grisor meanwhile is revealed to be in contact with his book owner Dr. Hakase. Dr. Hakase reminisces about the first time he met Grisor; Hakase was recently kicked out of an institute and Grisor offers to give him power to get revenge on the institute. Grisor leads Kiyo, Zatch, and Shion to the ruins where the three pieces are then combined into one. At that moment, Grisor makes his escape with the mirror.

Kiyo, Zatch, and Shion chase after Grisor but fail in retrieving the mirror from him in time. Hakase uses the mirror and causes Grisor to grow into a monstrous being which increases his spell power by a hundred fold. They engage in battle but are unable to cause damage to Grisor. When Grisor aims a spell towards Shion, Nya pushes her out of the way but Nya's book is burnt in the process. Shion holds onto Nya as he disappears from her arms. Grisor then traps Kiyo, Zatch, and Shion on a patch of land by surrounding the area with magma from underground.

Kiyo and Zatch continue their battle with Grisor. During the battle, Hakase explains the true origins of the mirror; the mirror was stolen by Grisor for the Mamodo battles but during his travel to the human world, it broke into three pieces and scattered across the world. An attack from Grisor knocks Zatch unconscious. As he prepares to knock Kiyo and Zatch into the magma, Shion knocks the mirror out of Hakase's hands cracking it. Zatch regains consciousness and uses "Bao Zakeruga" to defeat Grisor and the mirror is destroyed in the process. The next day, Shion decides to move in order to become a stronger person without being completely dependent on a person for help.

Zatch is haunted by a nightmare about Naomi. The next day he decides to challenge Naomi to a duel, and if he wins, Naomi will have to stop bullying him. Kiyo and his friends meanwhile visit the zoo. There they learn that an African Lion by the name of Gabriel has escaped from the zoo. Back with Zatch, Zatch loses the first and second competition against Naomi. In the third competition, Zatch is left in a pit-hole and Vulcan is tied up on a pole. Later one of the playground kids tell Zatch that Naomi has become stranded on a cliff. Zatch arrives and sees that a lion is with Naomi on the cliff. Wanting to help Naomi, Zatch climbs down but becomes stranded on a tree branch. Naomi seeing Zatch in danger climbs up the cliff and saves Zatch from the lion. Shortly after, the lion is captured and Zatch's dream about Naomi being the lizard queen comes true.

Li-en asks her father to return Wonrei to her but he refuses and sends her to Japan. On the way to the movies, Zatch and Kiyo's book is stolen by Li-en. She then returns their book and tells Kiyo that her father is a mafia boss and that he captured her Mamodo Wonrei. She asks Kiyo to help her free Wonrei. They travel to Hong Kong to an island where Li-en's father's mafia keep their treasure and weapons. After defeating some men on the way, they take an elevator to the top of the island where Wonrei is imprisoned. At the top of the island however is the Mamodo Zabas and his partner Galliont are awaiting for the elevator's arrival.

After exiting the elevator, they meet Zabas who reveals his intention to kill Wonrei while he is in his cell. Kiyo and Zatch decide to distract Zabas while Li-en tries to free Wonrei. Wonrei reveals no intention of escaping fearing that Li-en would be hurt in the Mamodo battle. When Zabas is about to attack Li-en, Wonrei escapes from his cell and defeats Zabas. Zatch asks Wonrei what kind of king he would be and he replies a king which protects all. Li-en and Wonrei leave but Zabas stands up ready to battle. Kiyo and Zatch defeat Zabas with the fifth spell, "Zakeruga", a more powerful and concentrated version of "Zaker". Li-en and Wonrei run into her father. He allows their relationship once seeing Wonrei's determination to protect Li-en and gives them a boat to leave the island.

Zatch loses at a lottery to win a yellowtail fish and a man decides to take pity on Zatch and gives him his tickets to an onsen. At the onsen, Kiyo finds a note in his room revealing the location of a secret onsen and an all you can eat yellow tail buffet. Upon arriving at the location, Kiyo realizes that it's a trap and they attacked by a Mamodo named Baransha and her human partner Garza. Kiyo and Zatch are at a disadvantage since Baransha can attack from afar and become invisible. As the battle drags on, Kiyo uses ginkgo nuts' strong scent in order to track down the invisible Baransha. Kiyo and Zatch gain the upper hand with "Bao Zakeruga" but Garza and Baransha manage to escape by jumping into the river.

Kanchome while waiting for Folgore to sign autographs, sees some candy in the back of a truck and climbs into it. The truck's door closes and Kanchome is driven away. Kanchome ends up at a circus and while wandering around, finds a girl named Rushka. Kanchome then volunteers to be her big brother. He follows her back to her farm where Kanchome learns from her guardian that Rushka's parents died and the closest thing she has to a family are sheep. Soon after, a Mamodo named Bago and his partner Fredo steals all the sheep on the farm. Kanchome follows the Mamodo in an attempt and return the sheep for Rushka. Folgore finds Kanchome on the way and decides to help Kanchome with his battle. Folgore and Kanchome end up at the cave where Bago and Fredo await.

After being severely injured by Bago, Folgore and Kanchome retreat. Rushka arrives to try Kanchome and her sheep but is kicked by Fredo. Kanchome seeing Rushka regains the will to fight. At that moment, the book glows and Folgore is able to read the third spell, "Dika Poruk". The third spell causes Kanchome to seemingly become an invincible giant but in reality, a hologram of Kanchome is actually being projected. While Bago and Fredo are distracted, Folgore runs through fire to reach Fredo. Folgore is able to grab and burn Fredo's book. After Kanchome says goodbye to Rushka and everyone at the circus, he and Folgore end up at a harbor. Kanchome seeing candy aboard a boat, boards it. At that moment, the boat heads towards the South Pole with Kanchome on it.

Zatch has a fever but decides to accompany Kiyo to school anyways. Kiyo and Zatch get into an argument and Zatch collapses from the fever. After placing Zatch in the care of the school nurse, Kiyo finds Apollo at school. Apollo tells Kiyo that after Rops' book was burned, he became the president of his father's company. He then reveals that the Mamodo who burnt his was someone that resembles Zatch. He reveals that in Holland, the Zatch look-alike ad his partner Dufort mercilessly defeated them in battle. Apollo reveals that the Zatch look-alike's name is Zeno. Kiyo promises that he will defeat them for what they done to Rops. Zatch wakes up from a nightmare about Zeno and visits Kiyo who tells Zatch to become a kind king.

Zatch asks Kiyo to take him to a Praying Mantis Joe show at the mall. Kiyo refuses and Zatch leaves to go watch it with Umagon. Zatch meets Suzy and the teacher's wife, referred to as Wife, who are both also heading to the mall. Once there, Suzy and Wife realize the merchandise they wanted that was on sale was fake. After watching the Praying Mantis Joe show, Zatch notices that Suzy, Wife, Ponygon, and many kids were upset about the false merchandise being sold. He decides to ask Praying Mantis Joe to help with the merchandise problems. The actor of Praying Mantis Joe tells the kids he is unable to do anything and Zatch with the kids leave determined to face the store manager. The store manager calls his bodyguard to deal with the kids. At that moment, Praying Mantis Joe arrives and is severely beaten by the bodyguard. Wife then throws an unconscious Joe onto the bodyguard knocking him unconscious. The store manager is then forced to give the real merchandise to the costumers.

A mamodo named Bari and his partner Gustav defeat a Mamodo. Bari feeling unsatisfied in his battles, decides to go to Japan where a strong Mamodo named Zatch resides. Bari finds Zatch and tells Zatch they shall battle in a factory three hours from now. Zatch and Kiyo arrive to the factory where they learn that there are still civilians in the factory. Zatch manages to save the civilian while Kiyo distracts Bari's attention. As Bari is about to strike Kiyo down, he hesitates due to Kiyo's eyes. Bari prepares to finish Kiyo off but Zatch manages to stop him in time. With no distractions, Kiyo and Zatch prepare to face Bari and Gustav.

Kiyo and Zatch are overpowered by Bari's spells. Kiyo and Zatch resort to their strongest spell "Bao Zakeruga" but Bari is able to block it. Kiyo is unable to move or use spells after using "Bao Zakeruga" thus forcing Zatch to fight Bari hand to hand. Bari hesitates when he sees Zatch's eyes causing Bari to be knocked down. Zatch moves Kiyo to a safe place and continues his battle. Kiyo attempts to help Zatch by running a Loader into the factory to collapse the ceiling onto them. Bari goes after Kiyo to burn Zatch's book. As he looks into Zatch's eyes again, he stops and asks why. Gustav asks Zatch what kind of king he wants to be to which he replies a kind king. Bari finds the idea ridiculous and challenges Zatch whether a kind king or a powerful king will be fit for the throne. He leaves sparing Zatch's book.

Ponygon after seeing Zatch depressed about his lost goes and searches for his book owner. Ponygon finds a man named Doronma who resembles Ponygon and assumes he is his bookowner. Zatch following Ponygon's scent is invited alongside Ponygon to visit Doronma's house. Doronma asks Zatch and Ponygon to help him in his plan to steal from the rich and give to the poor. Zatch and Ponygon agree to help him and after robbing multiple jewellery stores, Doronma proposes to steal a diamond from a mansion. Zatch and Ponygon assist him in the robbery but end up tripping every alarm. Doronma is later arrested by the police. When Ponygon shows him the book, Doronma replies that he saw a fly in the book and that he was unable to read it.

Sherry and Brago are searching for a Mamodo in the snowy mountains. They come across an injured old man and his grandson, Jeff, who are being attacked by a bear. Sherry and Brago use their spell to scare the bear away and Brago then carries the man back to his house. The man explains that the bear killed the Jeff's parents and they intended to get revenge with it. Brago leaves to wander around the mountain. Sherry's butler comments that Brago has changed into a strict and kind person, a perfect king. Brago returns with the bear's body and tells Jeff he must become a stronger person. The next day, a group of men threaten to bulldoze Jeff's and his grandpa's home. Brago defeats them and in vengeance, they detonate the explosives hidden in the mountain. An avalanche occurs but is stopped by Brago and his new spell "Dioga Gravidon".

Kiyo while shopping with Suzy finds a stone tablet similar to the one from before. Kiyo buys the stone and brings it home. He decides to use open minded tests on the stone while leaving the scientific methods to his father. Meanwhile, Zatch, Tia, and Ponygon decide to train for the tougher Mamodo battles ahead. Elsewhere, a strange man and his Mamodo Kido are on a plane heading to Japan to meet with Zatch and Tia. At night time, a mysterious Mamodo steals the stone tablet from Kiyo's room and at the same time in England, the stone piece Kiyo's father is studying is also stolen. Elsewhere, a masked Mamodo stares at his collection of stone tablets.

Kiyo and Zatch think of ways to get stronger until they are interrupted by Kido and his book keeper Dr. Riddles, who challenges Kiyo and Zatch to a battle. He reveals that the Majestic Twelve will be the one to fight him. Dr. Riddles then asks Kiyo to solve a riddle. After he answers correctly, Dr. Riddles and the Majestic Twelve leave. Dr. Riddles returns later and challenges Kiyo to a Mamodo battle. He reveals that if Kiyo defeats him, he will reveal the secret of the book. Kiyo and Zatch are at the disadvantage against Dr. Riddles. Dr. Riddles gives Kiyo a hint about the books and Kiyo realizes the truth about the books; the spells in the books are actually manifestations of the Mamodo's power. Kiyo tells Zatch to believe in the power that is inside him. At that moment, the book glows and Kiyo uses the sixth spell, "Rauzaruk".

"Rauzaruk" surrounds Zatch in a rainbow coloured aura but its effect is unknown. While trying to figure out the effects of "Rauzaruk" the rainbow aura disappears and the effects of the spell wear off. Kiyo and Zatch become overwhelmed by Kido's army of clones. Kiyo realizes that the power Zatch wished for must be the spell's effect. Casting "Rauzaruk" again, Zatch is able to defeat all of Kido's clones. Zatch reveals that he wanted power to protect Kiyo. Kiyo realizes that "Rauzaruk" increases Zatch's strength, speed, and defense greatly and with that power, they defeat Dr. Riddles and Kido. Dr. Riddles reveals that the latent powers inside Mamodos awaken when they mature spiritually or when the book owner's feelings reach them. Dr. Riddles then tells Kiyo that the evil one is gathering up minions and that Kiyo's help will be needed when the time comes.