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At one time, the world was suffering under Dark Lord Hadlar. That is, until peace was won back by a hero swordsman and his companions… Time has passed... Monsters liberated from under the Dark Lord now live on Dermline, a solitary island in the south seas.

A boy named Dai is the only human on the island. He wants to become a hero, and he's been living in peace with the monsters. But his life is transformed when Dark Lord Hadlar is resurrected. A promise to a mentor; encounters with companions; an unescapable destiny… Young Dai begins his adventure to become a hero, and to save a world once again in crisis!