The series ran for thirteen volumes, published by ASCII Media Works under their Dengeki Bunko imprint.
It was also released as the character song of Masaomi Kida from Durarara!! in the first DVD.
An example of an information broker in contemporary fiction would be DC Comics' superheroine, the Oracle, Edward G. Robinson's character Sol in the film Soylent Green, the Shadow Broker in the video game series Mass Effect, Nicholas Wayne, Rachel, Elean Duga, Gustav St. Germain, Carol, and the President of the Daily Days newspaper company in Baccano!, or Izaya Orihara in the anime Durarara!!.