‘Baccano!’

“Baccano”, which light novelist Narita translates as “stupid commotion”, is Italian for “ruckus”. Each of the stories in the series involves several unrelated plots intersecting and crossing each other as events spiral further and further out of control. Immortal alchemists, mafia operated speakeasies, and many other elements of pulp fiction are mashed together for a world straight out of the movies.

Descriptions taken from AniDB.net