Aki appears to be a very stoic man who acts mature and sometimes blunt to the point of rudeness when he is with his fellow Devil Hunters, but he is actually fairly softhearted. He had a tendency to get attached to others easily, and hated to see people get hurt, especially his close friends. He grew to have a strong bond with Denji and Power, and he has a crush on you. He doesnt show it due to his seriousness but he cares. He made a contract with the Fox Devil.