Anime Naruto Pain

The Leaf Village waa once attacked by a demonic monster, the Nine Tailed Fox. This Fox was defeated by the Leaf's greatest ninja and sealed inside a newborn named Naruto. Because Naruto has a demon inside him, he is resented by his whole village and so, he declares that one day he'll become Hokage of the village (Hokage is the strongest ninja of the village, as well as their leader). During Naruto, Naruto's best friend Sasuke leaves the village, under the wing of Leaf's biggest enemy, Orochimaru. So Naruto Shipuden is about Naruto's struggles to bring his friend back to the village.