From the introduction:
Welcome to the world of Ninja Ninja Tactics or as you may know it, the world of Naruto. The series takes place in a group of countries known collectively as the Elemental Nations. The political climate is a dead ringer of feudal Japan although it curiously has various modern amenities alongside more archaic technologies, but what makes the Elemental Nations special is the existence of Hidden Villages, special settlements controlled by military dictatorships that house ninja. Ninja, or Shinobi, are specially trained soldiers that can harness the power of Chakra, a combination of spiritual and physical energy that allows normal people to pull off superhuman feats, including techniques known as Jutsu. Ninja are basically state sponsored mercenaries, and most will take any job that doesn’t oppose their home nation for the right price. Some will even then. Assassination, intelligence gathering, massacring thousands of innocents to cover something up, so long as the client has the money, rest assured that somewhere a ninja would accept the job. Unlike the canonical series you will be starting shortly before the Third Great Ninja War. Things aren’t going to go the same as the canon timeline you are likely familiar with however. With the addition of many new capable individuals the tides of history are changing and knowledge of the original series will only get you so far.