"A Pure-Hearted Duelist! Start Up the OOPArts!!" is the one hundredth and twelve episode of the Yu-Gi-Oh! ZEXAL anime. It first aired in Japan on July 14, 2013.
Yuma is moping about in despair now that Astral disappeared. The Super Secret Number Cards Investigation Club decides to investigate the Barians, hoping it'll cause Yuma to return to his usual self. However a mysterious man named Semimaru, summoned by a revitalized Don Thousand steals everyone's memories! Semimaru challenges Yuma to a Duel, with their stolen memories and "Numbers" on the line! Can Yuma finally win on his own without Astral at his side and who is it that holds out a helping hand to the now bearish Yuma?
The Duel starts with every player having 4000 Life Points each, but Mr. Heartland activates a 'field effect', which reduces Yuma's and Trey's Life Points by half and Semimaru gains Life Points by the total amount they lost (Yuma 4000 → 2000; Trey 4000 → 2000; Semimaru 4000 → 8000).
