Togakure Ryu, the hidden door school, is beleived to be the oldest school of ninjutsu still in existence today. It is believed that Togakure ryu was founded by Daisuke Nishina in the 1100s (almost 800 years ago!).
This school is among other things known for its unusual weapons. The arsenal includes hand claws, foot claws, square shuriken, eight-point shuriken and boshuriken.
Makimono, the secret scrolls, are held by Masaaki Hatsumi, who is the 34th soke.