Cage of Eden

Akira and his classmates are on a plane heading back home after a field trip abroad. Suddenly, the plane crashes on a mysterious island. Akira is somehow still alive despite the crash, but soon discovers that he's not exactly safe and sound when enormous, supposedly extinct beasts begin chasing him. Akira slowly finds other classmates who also survived the crash. Some work together and some work against each other in an effort to survive on the strange island.