There’s a school of ninja.

It is said that the beginning of the ninja was the skill acquired by a mountain priest who went on a rough journey on Mount Togakushi around 678.
A faction of gyolees who believe in “Dakiniten, the devil of India,” holed up in Mount Iinawa and using the mountain as their dojo, created a magic known as the “Iinawa-no-Ho”.
In around 940, a lord of the Shigeno clan, who was appointed as the county chief and guardian of Iga and Kouga, was enshrined at the shrine as the founder of the Kouga and Iga schools. In 1184, Togakushi-ryu Ninjutsu was invented by Daisuke Nishina.
As time went on, many schools branched out across the country, and the number of schools is said to be 72, 75, and 82.

Main School
Nakagawa School in Aomori Prefecture, Haguro School in Yamagata Prefecture, Uesugi School, Keiji School in Niigata Prefecture, Fukuchi School, Matsumoto School in Tochigi Prefecture, Akutagawa School, Aoki School, Togaku School, Ito School in Nagano Prefecture, Koyo School, Takeda School, Matsuda School, Oshiko School, Oshiko School, Oshikou School in Yamanashi Prefecture, Hojo School in Kanagawa Prefecture, Akiba School, Ichizen School in Aichi Prefecture, Yoshitsune School in Fukui Prefecture, Rikoku School, Tsuji-Icumu School, Hattori School, Taki School, Yoshimori School, Uchikawa School, Takino School, Sawa School, Iga School, Koga School in Shiga Prefecture, Asuka School, Shugo School, Kyushu School, Gamo School, Kusunoki School, Natori School, Shinnusu School, Zoga School, Negai School, Kishu School in Wakayama Prefecture, Bizen School in Okayama Prefecture, Fukushima School in Hiroshima Prefecture.

The majority of the schools are said to have been split from the Iga and Koga schools.

Zhaoban Shimizu “Togakushi ninja” – Togakushi Nationalities Museum – Togakushi Zhaoban – “History of the ninja” – Kadokawa Sensho