Over 4,000 years ago, the hero Mithos brought the ancient war to an end at the sacred land of Derris-Kharlan. After concluding the war, Mithos made a pact with the goddess Martel, sealing away the Desians—the instigators of the conflict—and delivering humanity from suffering. As time passed, humans enjoying peaceful lives gradually forgot about the malevolent darkness known as the "Desians." Yet this evil force, which should have been sealed away by Mithos, quietly gathered strength and began to reemerge. The source of life, "Mana," was being drained, and the world was struck by unprecedented calamity. People awaited the coming of the Chosen of Regeneration, entrusted by the goddess Martel to seal away the "Desians" and deliver them from suffering once more. The girl Colette was born as the Chosen of Regeneration, destined to save this world shrouded in darkness. The day of the goddess's summons arrives, and thus the story begins...