He added that the forms of these primitive tools suggest that they may have been the prototypes of shuriken and other weapons used by the feudal-era undercover agents. Yuji Yamada, a ninja expert ...

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 ...