Before the birth of four dimensions named "Fusion Dimension", "Synchronic Dimension", "XYZ Dimension", and "Basic Dimension", the world was originally a "Unified World". Previously, four mainstream summoning methods named "Fusion Summoning", "Synchronic Summoning", "XYZ Summoning", and "Advanced Summoning" all existed in the "Unified World".
We have already developed and put "Real 3D Vision" into practice in areas other than Duel Monsters, and we firmly believe that "Unified World"'s unique "Super Real 3D Imaging Technology" will eventually bring about a qualitative leap in the development of "Duel Monsters". With this point of view, Akama Reiou is obsessed with the research of "super-realistic three-dimensional imaging technology" in order to realize the realism that gives life to "Duel Monsters".
After that, I don't know when the research on the too-real "hyperreal three-dimensional imaging technology" started, and the "Duel Monsters" showed clues of their real vital signs. However, because this phenomenon was too weak, it was not taken seriously by King Akama Zero. At this point, Pandora's box that led to the destruction of the "unified world" was quietly opened... Due to the real touch that "super-realistic three-dimensional imaging technology" brought to "Duel Monsters", humans became obsessed with the battles between "Duel Monsters", triggering a craze for the "real destructiveness brought by "Duel Monsters"", and the pursuit of this real destructiveness is increasing day by day. It was divided into four dimensions because of the zero point recovery.