Deadly Weapons Of Koga Ninja written by Toshitora Yamashiro. You will learn Kenjitsu Tetsu Bishi, Kusari Gama and 15 more art forms of the Ninja. The foreward is particularily interesting by the author and for those interested in Ninjutsu this is a great read for sure. Each weapon is well explained and teaches a great deal about how it is used.