In Tokyo's downtown district of Ikebukuro, amidst many strange rumors and warnings of gangs and dangerous occupants, one urban legend stands out above the rest - the existence of a headless "Black Rider" who is said to be seen driving a jet-black, soundless motorcycle through the city streets.

Mikado Ryuugamine has always longed for the excitement of the city life, and an invitation from a childhood friend convinces him to move to Tokyo.