Kaina of the Great Snow Sea manga volume 1 features story by Tsutomu Nihei and art by Itoe Takemoto.

A young man named Kaina ekes out an existence high atop the canopy that spreads from the titanic orbital spire trees. He and the handful of aging fellow villagers who remain believe they are the last humans in the world—after all, no one could survive amid the great snow sea that blankets the surface below. But they're about to learn how wrong they are…

Kaina of the Great Snow Sea manga volume 2 features story by Tsutomu Nihei and art by Itoe Takemoto.

To help Ririha return to her homeland, Kaina resolves to leave the canopy and descend to the snow sea. The trip will be a dangerous one, and once they leave they can never return. But what fate awaits them at the base of the great orbital spire tree—?!

Kaina of the Great Snow Sea manga volume 3 features story by Tsutomu Nihei and art by Itoe Takemoto.

Kaina and Yaona slip away from the palace to save Ririha, who has been taken prisoner by the Valghian navy and is confined to a cage hanging from the mast of the Admiral's ship. After an arduous journey, the two would-be rescuers manage to sneak aboard, but not everything goes as planned…