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 others finally reach the mysterious structure towering over the jungle below. Though they're thrilled to discover the first clearly manmade artifact they've found in this world, Eiken is nowhere to be found! Instead, all they find is his luggage... an ominous sign to say the least in a landscape full of savage predators!