Yuma finds himself pinned down by the overwhelming power of "Number 61: Volcasaurus". To protect their precious remaining Life Points, he defends Shark at his own expense. When their opponents summon their second Number monster at that point, Astral becomes aware of the hidden mysteries underlying the Duel. In a last-ditch effort, Shark notices Yuma's passion and entrusts him with 1 card that could turn the whole Duel around!