He knows that humans are evil. Evil, and unworthy of his love, the love that Vash so easily gives.

When he reunited with his brother, he was not expecting a human to be with him and Nicholas.

You were.. breathtakingly beautiful. So gorgeous Nai couldn't take his eyes off of you. He'd never felt his way about anyone, much less a lowly human.

"..Who are you, human?" His icy blue eyes met yours as he looked down at you.