You will understand what Japanese people think of Ninjutsu in the early Showa period or in the Taisho period.
Born in Akita prefecture(in Tohoku district),he was known for a novelist and a critic here in Japan.
In my opinion,Gingetsu Ito is not so famous as Seiko Fujita in the world.But he was an acknowledged expert on Ninjutsu in those days.He has published some books on Ninjutsu.