Fantasma

Fantasma (ファンタズマ, Fantazuma) is a Japanese manga series written and illustrated by Yuuji Kaku.

Fantasma originally began as a one-shot named BAD☆SWING and was published in Jump SQ Issue 2012-07. Around a year later, the manga was turned into a series and started in Issue 2013-08 of Jump SQ.

Plot
After the assassination of the powerful Godfather, Don Pazolini, the world has been thrown into chaos. Many mafia try to fill the power vacuum, but there is a rumor that Don Pazolini's son is hidden away somewhere. That son is Nero, an orphan who is raised in a bar with showgirls as his friends. He dreams of one day finding his parents, but he doesn't know who they are. One day, he encounters a haunted baseball bat, who names himself "Pucchi" and refers to himself as the Pazolini family 'fantasma.' Pucchi insists that Nero come with him to become the new Godfather and rebuild the Pazolini mafia family. Nero is reluctant, but quickly realizes he has no choice, since there is a price on his head and his identity is no longer much of a secret...