Ooyukiumi no Kaina

Synopsis:

a world covered in an ocean of snow that never ends and never stops growing. Either huddled around the massive tree roots that dot the surface or high in the canopy that covers the planet's atmosphere, the people survive. A series of events that will alter the course of the world are initiated when Kaina, a young woman from the canopy, and Liliha, a young woman from the surface, meet by chance.