Fire and Ice

Natsume discovers a girl with no voice yet strong powers hiding inside her. Here's the catch, she's human. With demons after her and time limit to find her voice again, who will need saving? Her, or Natsume? And with a mysterious woman lurking in the girl's past and shadow, can they discover and thaw the ice in her to unleash the fire? (Terrible summary, i know) slight NatsumexOC