The largest population of Japanese people outside of Japan is actually located in Brazil. São Paolo, to be exact. Of the roughly twelve million people who live there, more than a million and a half of them are Japanese or of Japanese descent; the legacy of a bilateral agreement between the two nations to promote migration in the late 1910s. This is, in a word, fascinating.
Yakuza Princess is set in this diaspora, the story of an orphaned girl with no knowledge of her past who was secreted away after her family was massacred. Now, of course, she is going to find out, and vengeance will be hers. Eventually.