Publisher's Synopsis
Zatch, Kiyo and their friends are in their most dangerous predicament yet--inside the body of a mamodo so big, it could swallow a skyscraper! The evil Riou wants to release the giant mamodo Faudo from his prison, and to stop him, they'll have to fight their way through the monster's heart, his brain, and the rest of his enormous organs! But are even Riou's normal-sized allies too much for our heroes to handle? To win this battle, they'll need to have guts--or get inside guts!
