Danger and action abound after Akira Sengoku and his classmates crashland on a deserted island while flying home from a class trip. The island doesn't exist on any maps but that's not even the strangest part: the animals they find on the island are prehistoric beasts that are supposed to have been extinct for thousands of years! Now Akira and his friends are in danger as the island's residents start eyeing the humans for their next meal. Will they ever solve the mystery of the island and find their way home?
Sengoku and crew evade various pitfalls to venture further into the pyramid. As they finally reach the deepest levels of this structure, they will make their greatest discovery yet and come that much closer to figuring out just what happened on this mysterious island. Meanwhile, Kokonoe and Ohmori hatch a plan to escape their impending execution, but will it be enough to save them from a fiery death? From the Trade Paperback edition.