Astral and Yuma Tsukomo journey together to beat the World Duel Carnival. Astral has lost all his memories as well, in the form of mysterious number cards. As Yuma and Astral duel, there is another one watching, but there is only one person who knows other than themselves. Who is it?

Shark's life has been thrown out of balance. Is he Human, or Barian? And who is this Oracle he has heard about?