A mountain fortress far to the north, where the only source of warmth for the inhabitants is the eggs of the fire creatures Nami. When the village chief is tragically killed, his young and fragile wife must assume the role of regent, raising two children. Meanwhile, her wayward eldest daughter, Han, experiences the loss of her father in her own way, resisting everything around her. One day she befriends mysterious little creatures, not yet realizing what they really are...