Mushi-Shi Season 2 Episode 3

Beneath the Snow

Ginko visits a village where it snows most of the year to study snow mushi. He finds a boy with a strange affliction that causes snow to fall on him perpetually. He's become insensitive to the cold, and warmth is painful for him. It's dangerous for him to expose himself to the cold so much, but he doesn't even seem to care.