What is the story of Pein in Naruto?

Answer 1

Twelve years before the start of the series, a powerful creature known as the Nine-tailed Demon Fox attacked the ninja village Konoha, killing many people. In response, the leader of Konoha- the Fourth Hokage- sacrificed his life to seal the demon inside the newbornNaruto Uzumaki. Konoha, however, regarded Naruto as if he were the demon fox itself and mistreated him throughout most of his childhood. A decree made by the current Kage, the Third Hokage, forbade anyone mention the attack of the demon fox to anyone else. This included Naruto, who was not aware of the demon inside of him. Years later, Naruto is tricked by the renegade ninja Mizuki into stealing a forbidden scroll that would teach him a secret ninja technique, but he is stopped by his teacher, Iruka Umino. When Iruka almost dies while protecting Naruto from Mizuki, who also reveals that he is the container of the Nine-Tailed Fox, Naruto uses the Jutsuhe learned from the scroll that creates multiple clones of himself, Shadow Clone Technique, to defeat Mizuki.

Naruto is assigned alongside Sasuke Uchiha, whom he often competes against, and Sakura Haruno to form a four person team named Team 7 under an experienced and severe sensei named Kakashi Hatake. Like all the ninja teams from every village, Team 7 is charged with completing missions requested by villagers, such as doing chores or being bodyguards. After several missions, most notably their mission to Wave Country as Tazuna the bridge builder's guards, Kakashi allows Team 7 to participate in a ninja exam in which they can advance to a higher rank, and thus, take part in more difficult missions. During the exams, Orochimaru, a criminal at the top of Konoha's most wanted list, attacks Konoha and kills the Third Hokage in an act of revenge. This forces one of the three legendary ninja, Jiraiya to search for his former teammate Tsunade, who has been nominated to become the Fifth Hokage. During the search, it is revealed that Orochimaru desires to acquire Sasuke due to his powerful genetic heritage, the Sharingan. Believing Orochimaru will be able to give him the strength needed to kill his brother Itachi, who destroyed his clan, Sasuke eventually joins him after a humiliating defeat at his brother's hands. Tsunade sends a group of ninja including Naruto to make Sasuke return to Konoha, but Naruto is unable to defeat him and bring him back to the village. Naruto does not give up on Sasuke, however, and he leaves Konoha to train for two-and-a-half years under Jiraiya's tutelage in order to prepare himself for the next time he encounters Sasuke.

After the training period, a criminal organization called Akatsuki attempts to capture the nine powerful tailed beasts that are sealed within people-including the Nine-Tailed Demon Fox sealed inside of Naruto. Several ninjas from Konoha, including Team 7, fight against the Akatsuki members and search for their teammate Sasuke. Although they manage to revive Gaara, the host of the One-Tailed beast and Kazekage (Leader of the Sand Village), Akatsuki is successful in capturing the other seven of the creatures (and thus killing the hosts). In the meantime, Sasuke betrays Orochimaru and faces Itachi to take revenge. After Itachi dies in battle, Sasuke is told by the Akatsuki founder and leader Tobi that Itachi was ordered by Konoha's leadership to destroy his clan. Saddened with this revelation, Sasuke joins forces with Akatsuki to kill Konoha's superiors who orchestrated the Uchihas' elimination.

Meanwhile, as several Akatsuki members are defeated by the Konoha ninjas, their figurehead leader, Pain, invades the village to capture Naruto. However, Naruto defeats him and convinces him to abandon the Akatsuki. With Pain's eventual death, Tobi-disguised as one of Konoha's founding fathers Madara Uchiha-announces that he wants to obtain all nine of the tailed beasts in order to perform an illusion powerful enough to control all of humanity. The leaders of the five ninja villages refuse to aid him, and instead, join forces to confront him and his allies. This results into a fourth ninja world war between the unified armies of the Five Great Countries collectively known as the "Ninja Alliance Army" and Akatsuki's forces.