Six years ago, Kamui Shirou and the Monou siblings, Fuuma and Kotori, were inseparable childhood friends. Following the sudden, gruesome death of the Monou siblings' mother, Kamui was taken away from Tokyo by his own mother. During the intervening years, the two lived peacefully as Kamui honed his innate telekinetic abilities. When his mother dies in 1999, her dying wish compels him to return to Tokyo to face his "destiny." Upon Kamui's return to the city, his demeanor has shifted drastically, and he demonstrates the growth of his powers through violent street confrontations. Various opponents seek him out, asking if he is "Kamui," but they appear to be demanding something far more significant than his name. These fighters represent two opposing factions—the Dragons of Heaven and the Dragons of Earth—each seeking to recruit him to their cause. By piecing together clues regarding the apocalyptic "promised day," Kamui realizes that he holds the world's fate in his hands. Depending on which group of Dragons he allies with, he can choose either to save the world—or end it.