Naruto: I start with one door, and I can open it infinitely.

The next day, Lin Chuan went to school as usual, and no Uchiha came to find him, nor did any of the younger ones come to beat him up.

This is a ninja academy, not a dark forest where big fish eat little fish. The Uchiha aren't shameless enough to send a Jonin to bully them.

He went to school as usual this morning, skipped school as usual this afternoon, and went home as usual after saying goodbye to Naruto after school...

Little did he know that after Sarutobi Old Man learned from Iruka last night that Lin Chuan had been taking good care of Naruto at school, he couldn't help but laugh, thinking to himself that Lin Chuan was an interesting little guy.

Then, this afternoon, Sarutobi Noboru went to Lin Chuan's house, met Lin Chuan's parents, and offered his condolences to Lin Chuan's father, who had retired due to injury.

When Lin Chuan arrived home, it was just as his adoptive father was seeing off a guest. He saw Sarutobi Old Man, dressed in casual clothes, looking like a kind and amiable old grandfather next door, with Nara Shikaku by his side. He was a little surprised that Sarutobi Old Man had arrived so quickly; he thought he would have to wait ten days or half a month!

"Xiao Chuan is back! Quickly greet Grandpa Hokage and Uncle Shikaku!" Lin Chuan's father, still beaming with excitement, pulled Lin Chuan up to introduce Hiruzen Sarutobi and Shikaku Nara.

"Grandpa Hokage, Uncle Shikaku," Lin Chuan's mind was in a mess, and he didn't have time to think much before calling him by his adoptive father's name. The Hokage was the top leader of Konoha, and Shikaku was also a member of Konoha's decision-making body, so he dared not be negligent.

"Haha, Ogawa's grown taller! I was still breastfeeding when I held you," Hiruzen Sarutobi casually rattled off his platitudes, something like, "I held you when you were little, you were chubby back then, and I even bought you candy." It was all too easy for a seasoned politician...

"This? Really?" Lin Chuan's father was a little confused by what Sarutobi Hiruzen said. The Hokage, such a big figure, really held his son, Xiao Chuan, when he was a child. How come he didn't remember?

"That old pervert, did he peep on other people breastfeeding their babies?" Lin Chuan knew in his heart that Sarutobi was talking nonsense. This man had wrinkles all over his face and didn't blush at all when he lied.

"Haha, then we won't bother you any longer. We'll be going now," Hiruzen Sarutobi said with a smile, turning and leaving. He led Nara Shikaku away from the village on the edge of Konoha before asking Shikaku, "Shikaku, how's the child?"

"He has talent and is willing to work hard, so he's worth nurturing," Shikaku knew what Hiruzen Sarutobi wanted to hear, so he directly said something nice. After all, that kid was Shikamaru's classmate, and it seemed like they had a good relationship.

"Hehe," Hiruzen Sarutobi could tell that Shikaku was being perfunctory; they were both shrewd people, but that wasn't what he was worried about.

The two remained silent for the rest of the journey, returning to the Hokage's office to continue processing the unfinished documents from the day...

……

With Hiruzen Sarutobi gone, the Lin family started their meal. They had planned to invite Hiruzen Sarutobi and Hiruzen to the meal, but both of them were very busy and would never eat at an ordinary person's home.

At the dinner table, Lin Chuan finally asked the question that had been bothering him, "Dad, what's the Hokage doing at our house...?"

"It's because of the disability compensation. They even asked me if I needed a job, saying I could work in the mission department," Lin Chuan's father said, grinning from ear to ear even while eating.

Having retired for many years due to injury, he thought the Hokage had forgotten him and only gave him some disability allowance each month. Who would have thought that the Third Hokage would personally come to visit him? For an ordinary Chunin like him, it was truly an overwhelming honor.

"Tsk, I think his real intention is not what he seems, but rather that he's after me." Lin Chuan shoveled rice into his mouth, realizing Hiruzen Sarutobi's intentions. He wanted to invest in the young genius in advance and keep an eye on him to provide protection, since the young genius had just offended the Uchiha.

Otherwise, Sarutobi wouldn't have timed it so perfectly, waiting until he was almost home before taking his leave, so that he could see that the other party had come to visit. He really knew how to scheme; he even used his sensory ninjutsu on elementary school students.

Of course, he didn't dislike this at all; on the contrary, he was happy to see it happen. He even found his cheap father an easy clerical job, so that he wouldn't have to go to the front lines to fight and kill, and could still support the family.

Moreover, Sarutobi Hiroto did it very cleverly. He didn't invest in himself in advance, but started with his parents and subtly influenced himself, making him feel good about the Konoha leadership and thus develop the Will of Fire.

If they were native Konoha children, they would definitely be influenced by Sarutobi's kindness and would definitely think that the Third Hokage was a great person. When the children grow up, they will definitely support the Third Hokage.

Even if the Third Hokage dies, he can still support the Hokage lineage, thus stabilizing a genius and preventing him from causing damage to the village. Orochimaru is a prime example of this.

As the Hokage of a village, he knows exactly which geniuses are in the village, so it's understandable that Sarutobi Hiroto did what he did.

If he can continue to be a genius, I reckon Sarutobi has already planned out how to lead a team of Jonin. Such a genius should definitely be included in the Hokage lineage as a master and disciple, so that the position of Hokage can be passed down from generation to generation.

Judging by actions rather than intentions, Sarutobi Noboru's tactic of winning people over is quite skillful...

As the saying goes, it's not hard to understand a person; you have to look at what they do, not what they say.

Even if someone is a hypocrite, as long as they can pretend for a lifetime, aren't they still a true gentleman?

As expected of a seasoned politician, Sarutobi Noboru did nothing wrong. He couldn't refuse this favor, nor could he refuse it; on the contrary, he needed it.

Fortunately, his moral standards are relatively flexible. Being grateful to Sarutobi now doesn't prevent him from killing Sarutobi later. He can also occasionally not eat beef.

Even after his reputation as a little genius spread, he could still use Sarutobi Hiroto as a shield; otherwise, if that old scoundrel Danzo took him, he would have nowhere to cry.

Sarutobi is at least reasonable in his actions, though he is somewhat pedantic, indecisive, and a compromiser. As for Danzo, that old scoundrel, he's a complete scoundrel, a rat in the gutter, with more schemes and tricks than eyes on his arm. He can't beat Danzo now, but he'll get rid of that old scoundrel Danzo sooner or later.

With Sarutobi Noboru's attention on him, he can train with peace of mind now, without worrying about that old bastard Danzo. But this isn't a long-term solution. Sarutobi Noboru is only a limited safeguard; he still needs a teacher who can protect him...

……

After the holiday —

"Phew, it's so damn cold..."

Lin Chuan exhaled hot breaths continuously. During his winter vacation, he could only jog with weights in his backyard to begin his day's training.

After finishing his five-kilometer jog, he returned to his own roof to replenish his water. The reason why today's jog was a bit difficult was because he increased the weight on his legs, from two kilograms to four kilograms.

Even though it's only an increase of two kilograms, he hasn't gotten used to it after two days. He can only adapt to the weight as quickly as possible. He plans to continue increasing the weight by two kilograms every six months, which is his training plan.

He had already met Xiao Li by this time. He was undeniably a training freak, so dedicated to physical training that he would sometimes fall asleep in the forest when he was too tired.

Of course, he can't compare to this guy because his talent is rather mediocre. His talent in ninjutsu and taijutsu is only average, while his genjutsu is somewhat weaker.

But that's okay. Most people are indifferent to genjutsu, which requires precise control of chakra. People with talent like Sakura can learn genjutsu much faster.

Since his ninjutsu skills are quite good, there's no need for him to obsess over taijutsu. Besides, his goal is ninjutsu, and he has the advantage of starting over. Learning ninjutsu is the most worthwhile thing for him because he can take the memories with him.

Each time he restarts a game, as long as he solves the problems of chakra quantity and chakra control, he can instantly master ninjutsu and use it, instead of waiting until his body reaches adulthood to unleash it like taijutsu.

After four months of training during his first semester in first grade, his progress remained consistently steady, all of which was clearly recorded in his notebook.

[Kunai throws, 722,300 times]

[E-rank Ninjutsu, Transformation Technique, 1350 uses]

[E-rank ninjutsu, Shadow Clone Technique, 1230 uses]

[Rank E Ninjutsu, Substitution Jutsu, 1630 uses]

[D-rank ninjutsu, Body Flicker Technique, 1560 times]

[C-rank ninjutsu, Water Release: Water Clone Technique, 370 uses]

[C-rank Ninjutsu, Water Release: Water Chaos Wave, 230 times]

My kunai throwing accuracy is close to 200,000 times. I also use the basic Three Body Technique, but only a few times, mostly during combat training. I'm too lazy to keep track of it.

He continues to improve his Body Flicker Technique, now focusing on finer control to make it faster, farther, and less energy-consuming, in order to increase its usage frequency.

The two C-rank Water Release ninjutsu techniques trained over the past six months have been successfully used two to three hundred times each. The direction of ninjutsu training going forward will remain focused on faster release, greater power, and less energy consumption.

Unfortunately, he still hadn't learned Shadow Clone Jutsu this semester. He only remembered when he was bored that Konohamaru also didn't know Shadow Clone Jutsu when he graduated, which shows that Shadow Clone Jutsu is quite difficult to learn, after all, it is a B-rank ninjutsu.

Chakra quantity and chakra control are both indispensable. Fortunately, he has already learned to climb trees and walk on water, so he has no problem controlling chakra. He just needs to learn the hand seals and practice a lot.

After putting down his notebook and resting for a while, he sat cross-legged under the eaves, ready to begin his chakra refining for the day. He spent several hours refining chakra every day, which were also the most tedious hours.

Although his body couldn't move, his mind was still thinking. Ever since Sarutobi Noboru came to his house a few months ago, he had been thinking about finding a teacher to protect him.

Since I am a Water Release ninja, I definitely need to find a teacher who knows Water Release, and also a teacher who can protect me, is easy to approach, and is not afraid of that cunning Danzo. My choices can only keep narrowing down.

This has resulted in him not finding a suitable Water Release teacher to this day. If we're talking about the most skilled Water Release ninja in Konoha, it would naturally be Tobirama Senju, whom we met the first time the gates were opened. But Tobirama Senju of this era is already dead.

Kakashi does know Water Release, although it's just a copied Water Release ninjutsu. But Kakashi is currently an Anbu ninja, so it's obvious he won't take me as a disciple.

The gatekeeper of Konoha, Izumo Kamizuki, can also use Water Release, but this guy is only at the level of a Chunin and is just a gatekeeper. He wouldn't dare to resist Danzo. Finding him as a teacher would only harm him.

After much thought, he realized that there were only a few ninjas who could protect him, and only those of the generation of Sarutobi Nobunaga could do so. Even the heads of the major ninja clans almost couldn't protect their own sons.

He searched for a teacher among the ninjas of Sarutobi's generation, but found that Sarutobi would not accept him as a disciple, nor would Mitokado Homura or Utatane Koharu, and the Sannin had already left the village many years ago, so that was also impossible.

But there was another person he thought was feasible: a contemporary of Sarutobi Ryouto, a disciple of Tobirama Senju, and a fellow disciple of Sarutobi Ryouto. This person was none other than Maruboshi Kosuke, nicknamed the "Eternal Genin."

He met this genin who came to receive the mission when he went to the mission department of the Hokage Building to find his adoptive father. His eyes lit up and that's how he came up with the idea of ​​a Water Release teacher.

Although Maruboshi Kosuke couldn't protect him, the old man's favor was very useful. Sarutobi Old Man, whom ordinary ninjas rarely encountered, was a comradeship forged in life-or-death battles between these two.

As long as he can become Maruboshi Kosuke's apprentice, it won't matter if Danzo has his eye on him. Although Maruboshi Kosuke can't defeat Danzo, Sarutobi Noboru can keep Danzo completely under his control.

Having decided to become Maruboshi Kosuke's apprentice, he had already been preparing for it when he met Maruboshi Kosuke.

To become an apprentice of this Water Release master, a disciple of the Second Hokage, he must possess impressive ninjutsu and demonstrate his genius; otherwise, why would the other party accept him as a disciple?

Therefore, after mastering Water Clone and Water Chaos, he went to his cheap father to demonstrate that he had learned these two water-style ninjutsu. When he asked to learn new ninjutsu, his cheap father taught him two more water-style ninjutsu.

These were exactly the two water-style ninjutsu techniques he needed to learn from his master: Water Release: Water Wall and Water Release: Water Dragon Bullet.

The Water Formation Wall, a B-rank ninjutsu, was alright. It only had five hand seals, which he had already memorized and used several times. However, each time he used the Water Formation Wall, it would drain most of his chakra, so he dared not use it at all.

He was completely stumped by the Water Dragon Bullet. The ninjutsu with forty-four hand seals was indeed well-deserved of its reputation. He immediately cursed that even dogs wouldn't learn it, but after cursing, he picked it up again and slowly memorized the hand seal sequence.

To become Maruboshi Kosuke's apprentice, he endured the forty-four seals of the Water Dragon Bullet; after all, he was a ninja.

It took him more than a month to memorize just these forty-four marks. It wasn't that he had a bad memory, but that he memorized them silently during class time, which took him more than a month of morning classes.

During this time, he also used a water dragon bomb once, summoning a water dragon by the river, which directly washed away the second training tree and broke it in half. He dragged the trunk home to use as a kunai target.

When he saw the tree trunk snapped, he was immediately astonished. B-rank ninjutsu was indeed different from C-rank. The first tree took half a year to break with water turbulence, while the second tree was broken with just one water dragon bullet.

It's no wonder it's a B-rank ninjutsu; the Water Dragon Bullet is amazing. If a B-rank ninjutsu has such power, I wonder what kind of power A-rank and S-rank ninjutsu must have.

Unfortunately, his chakra reserves are too low. Even if this body reaches the limit of chakra reserves and learns A-rank ninjutsu, his chakra will be completely drained after using A-rank ninjutsu twice. Using A-rank ninjutsu a third time will cause him to faint or even die.

Even B-rank ninjutsu shouldn't be used too often, let alone A-rank ninjutsu. He immediately suppressed the agitation in his heart.

The most urgent task now is to learn the Water Wall and Water Dragon Bullet techniques, and then become an apprentice of Maruboshi Kosuke to learn the simplified hand seals.

Considering that Maruboshi Kosuke is an approachable genin, we can find a time to have my adoptive father invite Maruboshi Kosuke to our home as a guest, and then take the opportunity to have him become my apprentice.