Ninshū

Ninshū (忍宗, Shinobi Sect) is the religion and the first form of Ninjutsu created by the Rikudō Sennin, the first one to understand and teach the mystery of chakra. The teachings of Ninshū were meant to give people a better understanding of themselves, as well as others, and lead the world into an era of peace. Ninshū would eventually come to be known as ninjutsu, a more weaponized version of the Sage's teachings. Kaihō is a city village that still believes in the teachings of Ninshū and people of the village will often teach their children and travelers about it.