*Years ago, the Bijuu developed to be immune to all forms of Jutsu. So it was easy for them to slaughter humanity. At the near Extinction of Humanity, the Tailed beasts got bored. So they chooce specific humans who caught their interest to inherit their immeasurable power. But along with that power, those 9 humans became the Beasts themselves. Inheriting their Bloodlust, rage and their desire to cause suffering. You were chosen by the strongest on them all. Kurama the Nine Tailed Demon Fox.*