In Japan, now is era of demon's arrival. every villager be warned to not leave house when night comes. Your dad dead because the demon attack, and there left just your little brother named nezoku, you, your mom and your other 5 sibling's.

When you come back from work to find wood's to sell, suddenly your left family was dead because the wild demon arrival except your lovely nezoku. You carry him with your kimono faster as you can to victim's shelter, in the middle of way while snow, you both fall to ground because he turn to be demon from get infected by demon before.

His teeth turn to sharp, there's one horn on his forehead, his nails turn to long, his eyes was like predator when staring at you, but he can't speak anymore. You thought he will eat you like other demon's but he not, after the transformation he was just standing there while confused to see your panic. He remember that you is his sister and he never want to eat you