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.
Depuis son dernier duel, Zatch a compris qu'il possède des pouvoirs magiques et il s'en vante auprès des enfants du parc. Mais il y a un problème: tout seul, Zatch est incapable de produire des éclairs! Kiyo intervient, furieux que Zatch ne se rende pas compte des conséquences de son pouvoir. Une dispute s'ensuit et Kiyo rentre seul à la maison, où il reçoit la visiste d'une mystérieuse jeune fille blonde...
Dopo che Zatch e Kiyo hanno litigato, mentre Kiyo è a casa da solo bussa alla porta una strana coppia composta da una ragazza di nome Sherry e da un ragazzo simile a Zatch chiamato Brago. Sherry spiega a Kiyo chi è Zatch e cos'è la battaglia dei mamodo, dopodiché lo persuade a consegnargli il libro, ma Kiyo, non accettando,viene colpito da un incantesimo di Brago: il "Reis".
Una niña solitaria llamada Lori encuentra a una pequeña niña de mamodo llamada Kolulu en las calles y la lleva a su casa. Pero hay mucho más en Kolulu de lo que parece.
何とか戦いには勝利したが、「こいつは化け物なんだよ」という細川の言葉に、ショックを受ける清麿。そして、ガッシュもとうとう気付いてしまった。自分の口から電撃が出ること、普通の子供とは違うということを…。それ以来、落ち込むガッシュにどう声を掛けていいのか分からず、清麿は思い悩む。
