Alternative title:
獣王星 (Japanese)
Juuousei
Planet of the Beast King
Genres: Adventure, Drama, Mystery, Shoujo, Shounen
Plot Summary: Thor and his twin brother, Rai, are cast off to a forsaken planet by unknown masked men after witnessing the suspicious death of their parents. Given only a beam knife and a smelly satchel, they wander together in search of civilization on the primarily plant based world. They soon discover the plants have the advantage. Only the strong survive; the ones who throw away their humanity and become the beasts humans once were.

No one watch this? It's great animu you must watch.