Durarara!! (デュラララ!!, Dyurarara!!^?) is a Japanese light novel series written by Ryohgo Narita, with illustrations by Suzuhito Yasuda. As of July 2009, six volumes have been published by ASCII Media Works under their Dengeki Bunko imprint. A manga adaptation by Akiyo Satorigi started serialization in the shōnen manga magazine Monthly GFantasy on April 18, 2009. An anime adaptation began airing in Japan in January 2010.^[1] The series is about a Dullahan working as an underworld courier in Ikebukuro, an internet-based anonymous gang called Dollars, and the chaos that unfolds around the most dangerous people in Ikebukuro.
Plot
Mikado Ryūgamine is a young man who longs for the exciting life of
the big city. At the invitation of his childhood friend Masaomi, he
transfers to a school in Ikebukuro. Masaomi warns him about people he
doesn't want to cross in the city: a violent man dressed like a
bartender, an information merchant, and a mysterious gang called
"Dollars". And to top it off, Mikado witnesses an urban legend on his
first day in the city: the "Black Rider".
from wiki

I'm watching this also. It's very interesting and is done by the same people that did Baccano!