To my knowledge Seiko Fujita was considered the last ninja of the ancient koga-ryu art. But he never taught ninjutsu to anyone.
So he let the Koga-Ryu art die with him. When he suddenly died.(Which there are different perspectives on how he died)
[Please don’t post opinions in serious threads, this is your thread. Stay here. ]
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[Reposted because it’s factual, not opinion]
Opinion
a personal belief or judgment that is not founded on proof or certainty;