Ao no Exorcist: Yuki no Hate-hen

There was a young man, who was a half-demon, Rin Okumura. He was training in an academy to know its original identity. He has no clue about his father. He wanted to come as an exorcist. For that, he keeps training in the academy. He knew about his demonic Powers and he wanted to protect humanity from the evil powers. Later he got knew about his father. Who is Satan? He has to continue their legacy. This changed his whole life and he lost a lot of friends and now he has to fight between light and dark.