Ninja literature

Ninjutsu's roots are going deep into Japan's history, and are directly related to its warriors history, clans fight, social segregation and military conditions. Many of the Ninjutsu schools were founded by formal samurais, willing to follow a different path, with a different understanding of the man, nature and fight techniques relation. With influences coming from the continent (chinese military, warrior monks, political refugees), from China or Coreea, the first art's methods were created as a new concept of life, including religious practices, mind and body fortification techniques, nature understanding methods, and more. Uh, I read the books first and I come back to smash your face. Please, wait for me muthafucka.