The World Once Protected by a Hero

There once was a demon king who nearly destroyed the world. And a hero rose up to protect humanity and the world. The hero succeeded in sealing away the demon king, but only one habitable land remained for mankind—Edelweiss. Time passes. A boy climbs toward the sky to overcome his own powerlessness. A girl fights against her cruel fate. A young man seeks to atone for his regrets and mistakes. They set their sights on the Heavenly Temple!