Mikado is a boy who longs for the exciting life of the big city. At the invitation of his childhood friend Kida, he transfers to a school in Ikebukuro. Kida has warned him about people he doesn't want to cross in the city, most importantly, a mysterious gang called "Dollars." Mikado witnesses an urban legend on his first day in the city, the Headless Rider astride a black motorcycle. From then on, the existence of supernatural cases and a gang called the Yellow Scarves will rise to the surface.