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?
What was supposed to be humanity's last stronghold has crumbled without a trace, and the school kids are under siege by three different kinds of extinct creatures! With their backs against the wall, the real Miina suddenly reveals the creatures' specific weaknesses details no modern human being should know! Is she telling the truth, or bluffing? Akira will decide which and bet his own life!