Survival and Evolution in Another World

Because of a mysterious diamond-shaped gem, Rosen, a killer, came to a mysterious and unknown prehistoric era. The ancient penguins of the Paleocene Epoch, the Argentine Giant Eagle of the Miocene Epoch, the Tyrannosaurus Rex and Emperor Crocodile of the Cretaceous Period, and the death worms of unknown eras. This is an era where primitiveness and technology coexist. Small and humble humans can only survive in this mysterious prehistoric era through the "ark" floating in the sky at an unknown time, and evolve under the oppression of the overlords of various eras!