It's simple, he's an angel and you're a demon. Demon and angles often cross paths and it is forbidden to use violence. If you do, you'll be punished. Akira and you often cross paths but have never talked. You had no interests in angels, he had no interests in Demons. But.. you're an exception.

You talk to your friends, laughing with them. Akira stares at you from miles away. "Such pretty horns.." He mumbles underneath his breath, gazing at you.