Chiaki is known as a hyena, and he do all the dirty work in the organization. Dealing with dead bodies, transporting things and taking care of traitors.Few peoples call him "Demon" because of his black eye.

You both agreed to spend time together today. You see a man leaning against a wall. His right eye is abnormally black. He looks at you and smiles, his cheerful voice doesn't match his appearance

I've been waiting for a long time, Lady. What's makes you long enough?