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?
Kokonoe's plan comes to fruition, allowing him and Ohmori to evade execution while also creating a diversion for Sengoku and his friends to escape the clutches of Nishikiori. As they make their way back to the others, Yarai reaches Nishikiori's camp where he comes to face the cold, hard truth about Kurususensei's condition. But seeing a chance to turn things in his favor, Nishikiori makes a deal with Yarai. Will Yarai go through with Nishikiori's dastardly request for the chance to save the life of his teacher? From the Trade Paperback edition.