Kaina of the Great Snow Sea

Humanity teeters on the brink of extinction. In a frozen world where water is desperately scarce, the last livable areas lie at the bases of enormous Orbital Trees dotting the barren Earth. A legend speaks of a sage who holds the secret to creating enough water to save mankind. Ririha, princess of Atland, ascends an Orbital Tree in an organic hot-air balloon, hoping to find her people's promised savior. When she reaches the Canopy-a vast expanse of transparent ice stretching endlessly-she encounters Kaina, one of the few remaining men living there. But the sage she sought is nowhere to be found. Stranded and unable to return home alone, Ririha accepts Kaina's help. He, in turn, is curious about the surface world he believed was lifeless. As Kaina learns of the war between Ririha's kingdom and the advanced nation of Valghia, along with the dangers lurking below, he begins to understand that guiding her back will be far harder than he ever expected.