The Centaur

Due to urbanization and warfare, the places where humans once lived had turned into deserts. When Martin–a young researcher–and his team were exploring the desert, they were ambushed by a huge monster and he was separated from his team. Fortunately, he was rescued by a mysterious centaur, who then protected him as he found his way back. Eventually, Martin discovered the secret of centaurs and world transmutation. None of them seems coincidental