Entering the vibrant chaos of Ikebukuro, 15-year-old Mikado Ryuugamine discovers a world beyond his online chats—a realm where a headless biker, the 'Black Rider,' enforces its version of justice. Amidst warring color gangs like the mysterious Dollars, Mikado is drawn into a web of urban legends, supernatural encounters, and intricately woven conspiracies. As he immerses himself in this perilous but intriguing landscape, Mikado realizes that Ikebukuro might hold the key to his true place in the world.