NAGANO--Hand-copied versions of part of “Bansenshukai,” one of the three major ninjutsu (ninja art) strategy books, were recently discovered at the Sanada Treasures Museum here, leading ...

But as the posters for Teenage Mutant Ninja Turtles promised, “This ain’t no cartoon.” The Teenage Mutant Ninja Turtles movie ...

In this latest instance, researchers discovered the first known copy of a legendary ninja training manual, making it an unprecedented find. The book on ninja secrets and techniques ...