The Bujinkan (武人館) is one of the schools famous for teaching Ninjutsu, the Bujinkan in fact contains nine distinct koryuBudo, three of them are indeed Ninjutsu ryuha. It has dojos throughout the world. It is headed and operated by Dr. Masaaki Hatsumi and is one of the X-kan.
... with no husband present, and 42.6% are non-families. 29.5% of all households are made up of individuals and 4.9% have someone living alone who is 65 years of age ...