The story begins when the father of the protagonist brings home a map fragment from a fishing trip; this map suggests to the protagonist and his friend that the world had, at some point in its past, many continents, though now there is only the small island of Estard (エスタード, Esutādo). The two of them find a way to travel back to the past, when the continents still existed. The continents are facing serious problems that threaten their existence; the protagonist and his growing party work to resolve the problems, and when they do, the continents reappear in the present. When all the continents are finally restored, the Demon Lord, who is responsible for the loss of many of the continents, appears and seals away many of the continents again. He then raises up his Dark Palace, where the party face the Demon Lord in a final showdown.