Dio fell from the sky prior to the story's opening along with his twin sister, Mel. The two of them were found by a mysterious stranger who raised them in the Narikiri House until they were around thirteen. Up until that point, nobody knew quite where they came from, but one day, a woman named Norn appeared who seemed to know about their past. Apparently, they would once committed terrible crimes and their punishment was a curse from the gods. The only way to stop this would be to travel to the past and undo what they did, but first they had to meet the Heroes of Eternity and fight off twelve Summon Spirits in the Ordeal of Spirits (せいれいのしれん Seirei no Shiren?).