Every one thousand years, one hundred mamodo descend upon earth to conduct the ultimate battle... Kiyo is a brilliant but aloof 14-year-old boy in junior high school. While exploring a rainforest in England, Kiyo's archaeologist father discovers Zatch, an unconscious mamodo child. He sends the goodhearted and mysterious Zatch to be his son's mentor. Zatch has amnesia; he does not have any idea that he is indeed a powerful mamodo! It is up to Kiyo and Zatch to discover this together...

This book reads from right to left.