I don't know but I found this video of this guy using Japanese Buttfuck Energy™ to block attacks and fuck people up.
http://www.youtube.com/watch?v=tib2Urowsdc
spoiler (click to show/hide)
http://www.youtube.com/watch?v=bQeUkUO5ZPo
And Yakuza are so big that they advertise freely on billboards in japan so he might be part of them. Might be killing the guy who burned his rice last night and all his family. Might.