1 Season - 12 Episodes.
A Killing begins with a Killing. Revenge initiates new vengeance. A tale of vengeance and sorrow begins now. The year is 1920, five years after the passage of the National Prohibition Act in Lorel, New York. Avilo, the main character, arrives to join the Vampiro family mafia undercover in order to exact revenge on the killers who murdered his parents and brother in this mafia.
Here is the youtube link to watch the trailer.
If it fascinates you, please refer to my first article of amazing anime streaming sites.