The only legitimate ninjutsu school are the organizations that were passed down from Takamatsu Toshitsugu. The 3 organizations are the
Bujinkan ,
Genbukan or the
Jinenkan all other organizations especially the so called Koga style are fakes. Historically there was no Koga ryu. Koga was a prefecture of Japan that did have many ninja clan but, there was no tradition called Koga Ryu. There is a very good instructor in SD by the name of Dan Weidman his email is
danw@viser.net.
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David Dow
Bujinkan Anko Dojo
"That is why I repeat over and over the need to throw away the forms.
But for too many people, they do not understand
no matter how many times they hear this."
Soke Hatsumi, Understand Good Play