The Chunin Exams finally begin and the proctor for Round One is none other than Shikamaru!

The genin are unable to figure out the answer and start to panic.

On the night before the Second Exam, the entrants gather in the cafeteria, and a brawl breaks out.

Yamato uses the first Hokage's chakra to suppress the demon fox's chakra and Naruto returns to normal, but with severe injuries. Sakura begins to heal him, but notes that medical ninjutsu has little effect on his wounds. Orochimaru's sword is revealed to have only pierced one of Sai's clones. The real Sai emerges, talks to Orochimaru and gives him a letter from Danzo. Sai then leaves with Orochimaru and Kabuto but Yamato's wood clone stays close on their trail. Naruto comes to his senses and wonders what happened but Sakura decides not to tell him the truth. They reach the meeting spot, picking up the picture book Sai left behind. Yamato infers that Danzo seeks to destroy and remake Konoha by collaborating with Orochimaru.

The temple monks explain that the tombs hold the loyal bodyguards of Fire Country's feudal lord. Naruto observes Sora sparring with other monks and becomes offended upon realizing he is holding back. Naruto challenges Sora, but just as the matter is about to get serious, another monk stops him. Naruto realizes Sora is despised by the other monks as he was himself and wishes to befriend him. Naruto visits Sora again and observes him practicing his wind jutsu in earnest, hoping to get strong enough to avenge his father. They later return to the temple to receive news that another tomb has been robbed.

Furido releases Sora's seal, and tells him the truth: Sora is a pseudo-Jinchuuriki. The chakra that had leaked from the Nine Tailed Fox when it attacked Konoha 15 and a half years ago was harvested and implanted into Sora. Just then, Asuma arrives at the scene with Naruto. Asuma recognizes Furido and it is revealed that he is Kazuma, Sora's father. Yamato, Sakura, Kiba, Lee, Ino, Choji and Shikamaru also turn up. Enraged, Sora wants to destroy everything, and turns into the Three-Tailed form of the Nine-tails. However, Yamato is unable to restrain him, because he does not have the First's necklace on him.

The chakra of the Nine-tails rages out of control within Sora, preventing Naruto and the others from subduing him. Asuma and Kazuma resume their old battle, while Kazuma justifies his actions with his duty as a pawn to the "King" of the Fire Country. Naruto is repeatedly knocked down in his attempts to restrain Sora, and the chakra seeps into him and transforms him as well. Yamato is unable to suppress the Nine-tails' chakra in both Jinchūriki, being prevented by an unknown outside force. Sora's fourth tail emerges, causing the Nine-tails's Cloak to envelop his body. He temporarily gains his own consciousness when he witnesses Naruto stab himself in the leg and successfully prevent the original Nine-tails' Cloak from emerging.

The struggle between Naruto and Sora continues. Asuma and Kazuma fight. Sai arrives, having snuck out of hospital, and binds Kazuma with an ink snake. Kazuma breaks out of Sai's jutsu and charges Asuma, but is killed. Naruto eventually reaches Sora, who manages to release the Nine Tails's chakra. Sora then leaves the village to travel the world. Asuma and Shikamaru play shogi and discuss who the king of Konoha is. Elsewhere, two Akatsuki members, Hidan and Kakuzu, appear chasing the Two Tails Jinchūriki.

Kabuto comments that Naruto's state is a consequence of his desperation to bring back Sasuke. Sakura begins to cry and approaches Naruto but is injured when his attention turns to her. Yamato uses the mokuton jutsu to bind Naruto before he does any more harm. Kabuto heals Sakura, reasoning that the Konoha ninja are not Orochimaru's enemies because they are also fighting Akatsuki. Yamato uses the abilities of the 1st Hokage to forcibly return Naruto to his normal state. Meanwhile Sai confronts Orochimaru with a message from Danzo. Orochimaru responds by piercing Sai with Kusanagi.

Sai receives a chilling glare from Sasuke's Sharingan that frightens him. Sai gives Orochimaru a bundle with information about Konoha's ANBU. Yamato gives Sakura and Naruto seeds with his chakra that enables him to track them inside the lair, and reveals that he was able to track Sai because he put a seed in Sai's clothing and food during the visit to the hot springs. Kabuto locks Sai in a room, and the boy summons a bingo book from scrolls he carries. Yamato uses a jutsu to open a tunnel into Orochimaru's hideout, and he, Naruto and Sakura travel to Sai's room undetected.

Yamato and the team enter Sai's room and confront him while Kabuto makes his way there as well. Sai tells Team Kakashi that not only was he to help with Konoha's destruction but also act as a spy against Orochimaru. Yamato reveals the secret of "Root"- its members were trained like Kirigakure's students in that they had to kill their friends so as to eliminate their emotions. Sakura returns Sai's book to him, remarking that he still has emotions because he treasures it. Sai then tells the group about his bond with his brother. Finally the team decides what to do about Sai's betrayal outside the lair. In doing so, Naruto tells the group about his own bonds and about how far he's willing to go to bring Sasuke back.

Kabuto fights Team Kakashi and frees Sai. However, Sai, who intends to learn more about his bond with his brother through Naruto's bond with Sasuke, betrays him. Captured, Kabuto gives a vague description of Sasuke's location to the team. Leaving Yamato's wood clone to watch over Kabuto, Team Kakashi enters Orochimaru's hideout and splits up to find Sasuke.

Asuma apologizes at the grave of the Third Hokage for not understanding his advice concerning what the "king" of the Fire Country is. At the hospital, Naruto and Sai recover, despite Naruto's desire to resume his training. Tsunade receives a report from Kakashi that Akatsuki is on the move. Elsewhere, Yugito Nii, the Two Tails Jinchūriki, struggles against Hidan and Kakuzu and unleashes the Two Tails, but is defeated and captured. Hidan and Kakuzu then turn their attention to the Fire Country for their next target.

The second stage of Naruto's training continues, while Tsunade sends out twenty teams composed of four ninja each to deal with the Akatsuki members in the Fire Country. Shikamaru leaves with Asuma, Izumo and Kotetsu, whereas Ino and Choji leave with Raido and Aoba. After putting in considerable effort, Naruto clears the second stage of his training, but collapses from hunger and exhaustion almost immediately afterward.

Team Kakashi begins facing off against the enemy shinobi. Yamato eludes his opponent, Fudo, by faking his death. Sora, unwilling to look for Naruto, goes off on his own. Back in Konoha, Danzo reveals that he is aware that he is being watched by Tsunade's ANBU. Naruto fights Fūka, whose kiss is fatal and shows her ability to use earth, fire, water and lightning jutsus. Sai manages to escape from his attacker, Fuen, and later saves Sakura from an enormous spider, becoming injured in the process. Sora then hits upon the enemy leader, Furido, and it is revealed that he was the group's target.

Furido taunts Sora until Sora unleashes his true powers, before informing Sora that he is planning to use the four corpses to save the Land of Fire. Naruto continues his fight with F?ka and learns that she can use all five elements. F?ka manages to kiss Naruto and begins draining his chakra. Realizing that Naruto is in trouble from extra-sensory perception, Sora rushes to rescue him. Sakura, Sai and Yamato arrive to help but are trapped by Fudo and Fuen. F?ka drains Naruto's chakra until she begins drawing on the Nine-tails's, which is too unnatural for her to successfully absorb. The enemy team retreats when Chiriku brings reinforcements.

Danzou is brought in for questioning after being caught meeting with a young Rain ninja. Sora confronts Asuma, and Asuma admits to having killed Kazuma. He attacks Asuma, his arm once again assuming a demonic form. Afterward, Naruto gets injured while shielding Sora from the attacks of an unknown individual, presumably from Root. Furido then approaches Sora, telling him to kill both Asuma and the Hokage to avenge his father. Later on, Naruto catches Sora going after Tsunade. Sora retreats as Shizune and a few other ninja arrive, but Naruto pursues him. At that moment, a mysterious lightning storm strikes, cutting off power to the entire village.

With Konoha in complete darkness, the village struggles to defend against the four attackers who have sealed the entire village behind a barrier. The entire village is in a state of emergency. Asuma, commanded by Tsunade to follow Sora and Naruto, finally catches up to them. Asuma realizes that the four invaders plan to annihilate the entire village using the lightning powers of the corpses that they stole. The revelation shocks Sora. As Asuma leaves to help hold off the attackers, he instructs Naruto to continue pursuing Sora.

Konoha's ninja fight off the revived zombie members of the Kohaku clan. The four Guardian Ninjas, Seito, Tōu, Nauma and Kitane, are also revived. Asuma realizes that they are planning to use Limelight, a jutsu in which the four create a lightning blast powerful enough to destroy Konoha. Asuma sends Sakura and Yamato after the other three while he remains behind to battle Kitane, but Fuen tackles Sakura and Fudo fights Yamato. Meanwhile, Naruto catches up to Sora, but Sora runs off in search of Furido. Naruto tries to pursue him, but is assailed by Fuuka. Soon after, Sora reaches Furido, who admits that he had planned to destroy Konoha.

Naruto deduces that Fuuka's secret consists of switching bodies to use each corresponding element and that her hair preserves her youth and body. Naruto damages her hair and it takes a life of its own dispensing the body, but Naruto finally kills it with a Rasengan. Meanwhile, Asuma manages to break free of the electric barrier, catch up with Kitane and defeat him in a short fight. Realizing that Kitane is no more, and that his three other companions were killed, Furido causes the 3 other ninja guardians to disappear. But Furido has a back up plan, Sora.

Team Kakashi returns to the Hidden Leaf Village after completing their mission. As Naruto thinks back to the talk he had with Itachi, he's summoned by Tsunade, where he discovers shocking news regarding Jiraiya.

Naruto, in the four-tailed state, begins attacking Orochimaru with incredible force, devastating the surrounding landscape and preventing Sai and Yamato's wood clone from approaching him. The majority of Orochimaru's attacks prove to be ineffective, but Naruto also fails to kill Orochimaru as he regenerates from any injuries he sustains. Meanwhile, Kabuto advances toward Sakura and Yamato, deducing that Sasori has died. Orochimaru finally manages to strike Naruto with a sword blade from his mouth, and Sakura reacts in horror when she sees Naruto's four-tailed state.

Naruto finally makes sense of the destruction he witnessed around him earlier. Yamato tells Naruto not to rely on the demon because Naruto is strong enough to withstand the demon's terrible chakra. Sai discovers the loss of his book while resting. Team Kakashi browse Sai's book, and they notice that the book (which can be read from both ends) contains different paths of two boys who meet in the middle. Each page has the boys fighting someone new, each time collecting the opponent's armor and weapons into the next page. The pages where the two boys would meet are unfinished. Orochimaru's group reach their base, not realizing that Yamato's wood clone trailed them there. Sai gets a glimpse of Sasuke's silhouette and eyes and discovers that he is the man Naruto and Sakura are looking for.

Orochimaru and Kabuto convince Sasuke to withdraw with them, and Naruto weeps over his failure to return Sasuke to the village, but Sakura reassures him that they will bring Sasuke back together. Naruto's team reports to Tsunade about the results of the mission, and Tsunade is greatly angered over Danzo's scheme, particularly his leaking classified information to further it. Sai asks Danzo to allow him to remain with Team Kakashi, and Danzo reluctantly agrees. Sai goes on a mission with his team, having come to see them as his friends.

Naruto and his clones continue to work on chakra nature manipulation by slicing leaves. After some struggling, Naruto approaches Asuma, who is also a wind type, for advice, after which Asuma gives Naruto's clone a few pointers. Naruto is subsequently able to slice a leaf in half. Asuma and Yamato head out with their teams on new missions. It is revealed that Asuma is the Third Hokage's son and that he is in a relationship with Kurenai. Meanwhile, on a hill overlooking a burnt village, four cloaked figures discuss the awakening of the Fire Country by eliminating the Leaf Village.