"Recollection Toward Antiquity - Durbe and Hakuba, the Legendary Illusion" is the one hundredth episode of the Yu-Gi-Oh! ZEXAL anime. It first aired in Japan on April 21, 2013. With the mysterious boy "Nasch" in town, Yuma and Astral head to the deepest depths of the ruins where the "Legendary Number" sleeps, but they come across a spirit guarding the "Number". In order to get the "Number", Yuma challenges the spirit to a Duel, but this Duel has a trick interwoven into it. Due to it, Nasch and Shark are captured. Yuma must help the two of them somehow, and the tips to solve this trap are hidden in the murals all over the ruins, written in ancient letters. In the depths of this struggle, Nasch demonstrates an amazing ability!