Yu-Gi-Oh! Zexal is the fourth series in the popular Yu-Gi-Oh! franchise, focusing on a young duelist named Yuma Tsukumo. He discovers a mysterious being called Astral, who helps him in his quest to collect the Number cards, powerful cards that hold great significance in the series. Together, they face various opponents in intense card duels. The series introduces new gameplay mechanics, including the Xyz Summoning method, which allows players to summon powerful monsters using cards of the same level. Zexal features a mix of adventure, friendship, and competition, appealing to both new and longtime fans of the Yu-Gi-Oh! universe.