Ooyukiumi no Kaina: Hoshi no Kenja S01

A world covered with an endless sea of snow. People gathered around the roots of giant trees that stood on the ground, or lived under canopies that spread around the earth's crust. A chance encounter between Kaina, a young woman from the canopy, and Ririha, a girl from the surface, led to events that changed the fate of the earth.