In the Arc-v universe there are 4 dimensions: Standard, Fusion, Xyz, and Synchro. But really there are 5. The Ritual Dimension, home to Yuki Kōriryu a high ranking student at the Blood Vulture Academy a school that teaches people to be assassins as well as duelists. But when Yuki is on a mission to the standard dimension he meets Yuya Sakaki and personalities clash.