In Paradise City’s You Show Duel School, a second-year middle school student named Yuya Sakaki aspires to become a professional Dueltainer, and awakened a new power called Pendulum Summoning which attracted attention of the Leo Corporation’s president, Declan Akaba. Yuya later meets three Duelists who greatly resemble him: The collected Xyz duelist Yuto whom he unknowingly absorbed, the overconfident Synchro duelist Yugo, and the sadistic Fusion duelist Yuri. These look-alikes originate from other dimensions besides Yuya’s Standard Dimension as he and his friends find themselves in the middle of an interdimensional conflict against the Fusion Dimension’s Duel Academy, which Yuri attends. Duel Academy is led by his estranged father, Leo Akaba, who seeks to unite the four dimensions. Declan formed a group of elite Duelists called the Lancers to stop his father, while they build their numbers during their travels to the Synchro and Xyz Dimensions.