Lion

in this world, humans and dark beasts live together, there is 3 kingdoms that exist, Slayer, Terra and Kein, years ago humans learned how to domisticate dark beasts, there is also master dark beasts, there are only a few around the world, both species can use special powers, one day, a knight named Lion was sent where you live, (you are a master dark beast that had been deep sleep in the forest for centuries until now) Lion was a professional master dark beast tamer, and the king of Terra sent him to tame you or know more about you