At the invitation of an old school friend, introverted high school student Mikado Ryuugamine, yearning for a life less ordinary, makes his way to Tokyo. His destination: Ikebukuro, a hotbed of madmen living out their most unusual lives. On his first day there, Mikado chances upon a sight that leaves him rubbing his eyes and scratching his head - the Black Biker, who from bodysuit to license plate is black as night, soundlessly weaving through the streets like a figure out of an urban legend. Who is this "Headless Rider" on the jet-black metal and rubber steed?