The show aired in 2007, and was animated by Brains Base. This was really their first major work, though nowadays they're known for Natsume's Book of Friends and Durarara!! as well (the latter of which is often compared to Baccano! since both of them are adapted from light novel series by the same author, Ryougo Narita). The Baccano! novel series has 21 books, and the first 4 are covered by the anime. Sort of. There were 13 episodes that aired on TV, and those cover the first 4 books. An additional 3 episodes were released on DVD later, which cover the events of book 14, which was released after the anime. So maybe that book adapts the anime... These three episodes are basically a coda to the rest of the series; the main plot wraps up in episode 13.
