A/N: This is a flashback of Naruto's training during the week he was in Uzu.

"Naruto" Normal speech
'Naruto' Normal thought
"Rasengan" Jutsu/Seal

Uzushiogakure
Secret room
Time chamber

Naruto and Jushiro walked into the time chamber and looked around. It is a not very big temple. But it has all the necessary rooms for living. There was also a library that had all Uzumaki scrolls in it.
Outside of the temple, there is a huge square. At the both side of the temple there were two sand watches on each side.

Naruto walked to the square outside the temple then turned to the temple and muttered.
"So this is a time chamber. I never imagined a place like this exist"

"That's right, Naruto. This is a special training place of the leaders of Uzu during the time of wars. In this place, one month here equal a day on the outside. Also you could change the gravity condition here. You doubt need to worry about the food, it will be enough for you in 7 month of training here" said Jushiro and walked closer to Naruto.

"So that's why Uzu has the strength to survive for so long. It's because of this special training place. It's definitely a valuable place. I am honored to be training in a place like this" said Naruto and bowed down his head to Jushiro.

"Alright, Naruto. If you don't mind we should start right away. We only have a week outside after all. And I want to transfers all by knowledge and skills to you" said Jushiro turning to Naruto.
"Hai"

"Ok, let's start with a demonstration of you chakra level. I know as a jinchuuriki you have really a decent amount, but let's see the result" said Jushiro and tell Naruto what to do.

Naruto nodded his head and makes a ram sign then began to mold his chakra. The wind slowly began to pick up in response to his chakra level. Then a wave of chakra began to form around Naruto's body and two wave wrapping his body. The wind began to blow even harsher. After 1 more minute, the chakra around Naruto began to form a tornado and the wind become a little tempest.

Jushiro all the while looking at shock when Naruto's chakra has reached the limit.
"Impossible, his chakra is nearly the level of a Kage-level shinobi already at this age. In the past, I knew a decent amount of jinchuuriki that had a high level of chakra, but this is the first time I see a child has this much chakra. So this is a Sadame no Uzumaki. An Uzumaki that destined to recreate and restore Uzumaki clan to its former glory. If he decided to take a revenge for our clan. Then Konoha, Kumo and Kiri may even be destroyed. And I also not count the fact that his Uzureigan still hadn't reach its final stage" analyzed Jushiro looking at the chakra molding figure of Naruto.

Naruto finished molding chakra and panted heavily. Then he turned Jushiro and asked.
"S-so how is it, Jushiro-sama?"

"Your chakra even at this age already reached Kage-level. That was just incredible. But with a large amount of chakra there will be a disadvantage in controlling it. That's why we will learn to control it slowly" replied Jushiro and explained to Naruto of the disadvantage of controlling chakra.

"So how do you increase the chakra control?" asked Naruto putting his knuckle under his chin.

"Well, the basic exercise and the first stage in controlling chakra is called tree climbing exercise. Like its name you need to climb the tree, but only with you feet. To do that you need to mold a necessary amount of chakra in order to stick to the tree. If you added too many you will be blast from the tree, too little and you won't be able to stick to it. The key to the exercise is to find a balance between them. There are still the water walking exercise and leaf concentration, but that's for later. I think you should start the exercise right away" said Jushiro and the surroundings began to change and the forest began to appear out of nowhere.

Naruto looked at the sudden change in awe. Then he walked to one of the trees and closed his eyes and began to concentrate his chakra to his feet. He snapped open his eyes and began to run up the tree. But he only managed to makes four steps before he was blast back.

"It's harder than I think. And according to the blast I put too many chakra in the feet" analyzed Naruto with narrowed eyes.

With that he concentrates chakra to his feet again and began to climb tree. Meanwhile, Jushiro just watched as Naruto doing the exercise silently. He knew that this exercise will be hard for Naruto to complete due to the amount of chakra he possesses.

Time skip
4 days later in time chamber.

Naruto is still struggle with the exercise and panting heavily. So far, he managed to get only half of the tree. Naruto wiped his sweat from his face away and took a breath then continue the exercise again. Slowly but he began to get a hang of the exercise.

Naruto's progress this time is 4/5 half of the tree. Then he began to fall from the tree to the ground in exhaustion.

"Damn, I was so close" muttered Naruto with one of his eyes close.

Jushiro appeared beside him and catch him before he hit the ground.
"Take a rest for a while. Don't overdo it. We still have 6 month and 3 days" said Jushiro to Naruto.
Naruto nodded his head tiredly and passed out

Time skip

And so Naruto's harsh training began. He and Jushiro worked on chakra control the first month of the training. By the end of the second week of the month, Naruto has mastered the tree climbing exercise. Right after that he began the water walking exercise. It took him about a week, because the principle of the exercise is the same as the tree climbing. The remaining week Naruto sat in lotus position and began his leaf concentration exercise. He took the hang of the exercise very quickly and by the end of the week managed to finish it.

Then come the second month. In this month, he learned all the seals that taught by Jushiro. There are different kinds of seals from exploding tag to creating a barrier. Jushiro also taught him makes the secret seals of Uzumaki clan, the healing seals. They are a very useful seals, because even if the user is not a medic-nin he or she need only to his or her chakra to the seal to transform the chakra to the healing chakra. Jushiro also wanted to tell Naruto about the seals on his stomach. But Naruto declined and replied that he wanted to explore that seals alone, because it's his responsibility. Jushiro shrugged his shoulder at his choice. After that Jushiro and Naruto also began to invent new seals.

At the start of the third month, they decided to train Naruto physically in the increased level of gravity. Naruto sparred with Jushiro every day and after day the gravity is increased. For a normal person, they wouldn't be able to survive this training, but Naruto is not a normal person by any means. Not only he is a jinchuuriki of Kyuubi, but as Sadame no Uzumaki, he also have enhance healing rate even on par with Senju Hashirama. That's the only reason that he could survive this training. During the training, Jushiro also trained Naruto in controlling his emotions, to keep them in check.

During the fourth month, Jushiro began to teach him kenjutsu of Uzumaki clan. The style is utilized the skill, heart, technique and its body at maximum level. The one that managed to completely mastered the unification of those facts above could reach the highest level of kenjutsu, so called Realm of Nothingness. It's a unique state where the swordsman could erase all his KI, his presence even all his emotions. The fearsome point of Uzumaki kenjutsu are the 4 ultimate technique of the style. It consists of 4 techniques that was name after 4 Deity Beast: Seiryuu, Suzaku, Byakko and Genbu. But the one uses those technique also need to pay a heavy cost. Because to use the technique you need to apply your own life force to activate it. As a result the lifespan of the user will be shortening, each time he used those techniques. But to learn those techniques also is not a simple task either. To learn those techniques need goes through the hellish training each day. Or the teacher will need directly infused those techniques in the student's body. But of course the death rate of the second method is far higher than the first. There is also one more far greater technique then the four above though no one has managed to unlock it as to use it need to master all the four techniques state above.

The fifth month began with the training of ninjutsu. Jushiro intend for Naruto to go through the elemental training so he decided to teach Naruto one of Senju Tobirama's kinjutsu called Kage Bunshin no Jutsu (Shadow Clone technique). It was called kinjutsu not because it was dangerous but because of the chakra need to create each clone and also the information gathering ability. But there is also one purpose that the technique has. The wonderful thing of the technique is that each clone is a solid clone of the original, which means when the clones disperse themselves the original will gain all the experience. Jushiro used this fact to train Naruto in elemental training. As for the elemental chakra, Naruto has two elements right now. Fuuton and Katon. The training takes 1 more months, as he is trying to gain the mastery of both elements.

The last month is to combine all the knowledges of the past training and applies them in real battle. Naruto even though still haven't mastered everything that he was taught still managed to use them very effectively in a battle. And so comes the time when Jushiro will disappear from the land of living.

Time skip.

Naruto now wears a white high collar T-shirt with Uzumaki symbol at the back. Around his neck was a long red scarf. He also wears ANBU pants and a shin guard at the ankles. He turned to the nearly disappearing figure of Jushiro and bowed down.

"I thank you very much for what you've done and told me the truth about our clan, Jushiro-sama. I promised that I will try my best and brings the Uzumaki clan back to its former glory" said Naruto.

Jushiro smiled a little and said.
"It's the least I could do for the hope of our clan. I didn't really approve that you decided to take the path of revenge, but I understand why you choose that path. After all, you had witness the death of each person though Uzureigan. But just remember that the revenge won't bring any happiness to anyone. No matter what you do you will always have my blessing. Because we are family and die Uzumaki the family is very important"

Naruto looked down and muttered after hearing what Jushiro said.
"I-I know that the revenge won't be able to bring the dead back to life. But..but even so I won't accept and forgive this world that sacrifice our clan for the sake of their own peace. How many Uzumaki did they sacrifice for the peace that they obtained now? How much blood was splattered for their peace? I won't accept a world like this! This world is not right from the very beginning. And I will be the one to correct it"

Jushiro sighed one last time as his body began to slowly disappear. Then he turned to Naruto and said.
"Then I wish you good luck on your path. But remember if you destroy this works then you need to take the responsibility to recreate it as well. Good bye, Naruto Uzumaki"

With that Uzumaki Jushiro disappeared in a spark of light. Naruto brought his hands to cover hue eyes from the light. And when the light disappeared he looked at the remainder of it and muttered.
"You and the rest of the clan rest in peace now. Just watch from above how I reconstruct this rotten world"
With that said Naruto walked out of the time chamber and walked outside of the secret room. It's time he return to Konoha and slowly to realized his plan into reality.

A/N: Next chapter is a time skip of 5 years and the graduation exam. Naruto will be a deadlast for a reason that will explain in the next chapter. Naruto by that time is already mid-jounin level.