 This story had many inspirations, such as the Japanese manga series "Lone Wolf and Cub", the American gangster John Patrick Looney, and various gangster films such as "The Godfather" and "The St. Valentine's Day Massacre".This story was the basis for the 2002 film of the same name.This three-part miniseries of graphic novels was written after the original story, but deals with events within the same timeframe.