OTSU, Japan - Textbooks detailing covert techniques used by ninja -- Japan's feudal mercenaries-- and written pledges on their secret missions were passed down for generations at the home of a ninja descendant in western Japan, according to analysis of ancient documents found there.
Sorry. This article is no longer available.
Sorry, this article was first published more than three months ago and is temporarily unavailable.
Once the upcoming introduction of a paid membership system is fully operational, paid members will have access to all our stories.
Free Membership Provides
Newsletter from Editorial Team and access to archive articles from past three months.
By continuing, you agree to the Terms of Use,
and Privacy Policy.
