it is bujinkan,i received my black belt back in 1996.but i have studied many systems before and after, so i don't consider myself a pure bujinkan guy.in the first video,i explain my martial art background http://www.youtube.com/watch?v=mjH248B8LKk&feature=c4-overview&list=UUGC4xThGxe-kEx1JXUs9TcA