Oyukiumi no Kaina

A phenomenon called the Snow Sea inundates the world; living high above the Snow Sea, a villager named Kaina goes on a hunt and finds something unexpected.

Kaina and the other villagers find out there is life below the Canopy.

In order to safely return Ririha to her nation, Kaina goes with her to assist their climb down the spire tree, knowing he will not be able to return to his village again. Their travel goes smoothly, but the Valghians were waiting for Ririha at the base.

The Valghians capture Ririha so they can strongarm the Atlandians into surrendering. The Atlandian soldiers engage in the battle to rescue Ririha and Kaina, but aren't successful. Ririha manages to free Kaina while she remains in captivity.

After learning of the King of Atland's decision to not rescue Ririha and instead go to war with Valghia, it's up to Kaina and Yaona to go save Ririha. Without a means to travel the sea, they must figure out an alternative way to get there.

Once the Valghian admiral receives Atland's message that they will not surrender, he decides to leave Ririha outside to freeze to death. Luckily, Kaina and Yaona come to her rescue, but now they must figure out a way to escape and return to Atland.