It All Started Here
There exists the three hidden ninja villages throughtout the world of "Era of the Shinobi". Konohagakure, Kirigakure and Sunagakure no Sato. There also is the Seinaru Kenouhou, a faction formed by the deadly samurais and priests(priestess), who in the Iron Temple co-live and train.
This affected thousands of lives living in the said Ninja Villages. Some perished, some survived and lived to tell the tale.