Twelve years before the events at the focus of the series, the Nine-Tailed Demon Fox attacked the ninja village Konohagakure. Powerful enough to raise tsunamis and flatten mountains with a swish of one of its tails, it raised chaos and slaughtered many people, until the leader of Konohagakure – the Fourth Hokage – sacrificed his own life to seal the demon inside Naruto when he was a newborn. The Fourth Hokage, who was celebrated as a hero for sealing the demon fox away, wanted Naruto to be respected in a similar light by being the containment vessel for the demon fox.
Konohagakure, however, shunned him, regarding Naruto as if he were the demon fox itself and mistreated him throughout most of his childhood. A decree made by the Third Hokage forbade anyone to discuss or mention the attack of the demon fox to anyone, even their own children. However, this did not stop them from treating him like an outcast and as a result he grew up an orphan without friends, family, or acknowledgment. He could not force people to befriend him, so he sought acknowledgment and attention the only way he knew – through pranks and mischief.