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?
Akira and the gang start to climb "Devil's Mountain" in order to figure out the mystery behind the birds. There, atop the mountain, they find a shocking message! With all their hopes crushed, will they find a way to continue living?