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

Since learning Maruboshi Kosuke's two simplified versions of Water Release ninjutsu...

Lin Chuan returned to his monotonous and tedious truancy routine. After three months of continuous practice, he mastered the simplified hand seals for the Water Array Wall and Water Dragon Bullet.

Compared to the original Water Dragon Bullet with 44 seals, which required him to form seals for at least ten seconds to release the Water Dragon Bullet, the simplified version allows him to form two seals per second and release the Water Dragon Bullet in three seconds.

The Water Barrier Technique is even faster, capable of being released in a second. However, his chakra is somewhat insufficient, so he can only choose one B-rank ninjutsu to use: the Water Barrier Technique or the Water Dragon Bullet.

[Kunai throws, 722,300 times]

[E-rank Ninjutsu, Transformation Technique, 1360 uses]

[E-rank ninjutsu, Shadow Clone Technique, 1250 uses]

[Rank E Ninjutsu, Substitution Jutsu, 1660 uses]

[D-rank ninjutsu, Body Flicker Technique, 1700 times]

[C-rank Ninjutsu, Water Release: Water Clone, 500 times]

[C-rank Ninjutsu, Water Release: Water Chaos Wave, 370 times]

[Rank B Ninjutsu, Water Release: Water Wall, 35 times]

[Rank B Ninjutsu, Water Release: Water Dragon Bullet, 52 times]

[Rank B Ninjutsu, Shadow Clone Technique, 0 times]

The above are the results of his ninjutsu training recorded in his notebook. Because the Water Dragon Bullet was related to his apprenticeship plan, he used it more than ten times to prevent things from falling apart during the apprenticeship process. However, he finally managed to complete the apprenticeship smoothly.

After mastering these two water-style ninjutsu, he wanted to learn other ninjutsu from Maruboshi Kosuke, but every time his father brought back news, it was Maruboshi Kosuke who was on a mission.

Damn it! Ever since he finished learning Water Wall and Water Dragon Bullet, Maruhoshi Kosuke seems to have had no rest. He's been working tirelessly on missions, making it difficult to even see him. He can't go to the other person's house to find him either, as that would disturb his rest.

It's June now, and there's still a month until summer vacation in July, so he decided to go find his adoptive father and learn the Shadow Clone Technique that he's always longed for.

It's not that he likes to be greedy or not strive for excellence; it's that he always brings his memories with him when he travels through time. If he doesn't take advantage of this peaceful period to learn more ninjutsu, he won't have such a good learning opportunity when he travels through time again.

No one would think he could use this body to complete Naruto. His body's talent is only that of a Chunin. Don't be fooled by his current bravery and progress; it's all thanks to relentlessly squeezing out his potential. If he continues to train without regard for the cost, the hidden injuries left by the training will prevent this body from living past thirty.

Talent determines a ninja's ceiling. No matter how hard he tries, this body can't become a Jonin. Training like Guy and Rock Lee might make it possible to become a Jonin, but it's completely unnecessary because he can restart.

In this world that values ​​bloodlines, restarting is the fastest shortcut for him to become stronger. There's no need for him to abandon the essentials and become some kind of hardworking genius. He wasn't a genius to begin with, but the accumulation of experience through repeated transmigrations will allow him to become one.

Furthermore, even a Jonin cannot complete the Naruto series. No one really believes that the ninja world is full of kind-hearted people. Without chakra and sufficient strength, he wouldn't even survive a single episode. If it weren't for the fact that he had a way out, he would have been killed by a samurai with a sword in the very first episode.

To roam freely in this ninja world, you need at least Kage-level strength. To become Hokage, you need at least Super Kage-level strength, otherwise you'll be doomed if you encounter Otsutsuki.

He was well aware of the limits of this body. He had learned the Second Hokage's simplified version of Water Release ninjutsu and could barely reach the threshold of Special Jonin, but that was already his limit.

Once he reaches the limits of this body, he will leave the Naruto world he has traveled to this time and start the next Naruto travel, where he will only be stronger than this time.

Composing himself, he sat in the last row of the classroom and began his chakra refinement for the day. He needed to reach the Chunin level by graduation, which was fundamental for him to compete with those geniuses. He had to stick to it and not slack off.

Before leaving at noon, Iruka reminded all the students present that there would be a battle training session in the afternoon, and everyone should not be absent.

When talking about ninja battle training, he looked at Lin Chuan. This kid always skips class, and he wondered if he could keep his opponent in this ninja battle.

Noticing Iruka's gaze, Shikamaru glanced at Lin Chuan, this freak, out of the corner of his eye. His lips twitched slightly involuntarily. He already knew that Lin Chuan had learned B-rank ninjutsu, and he was afraid that no one in this class could beat Lin Chuan in a ninja battle.

Then, he noticed the eager Uchiha and couldn't help but feel sorry for Sasuke. Sasuke was definitely going to get a good beating that afternoon, provided he didn't skip class.

……

The afternoon arrived quickly...

All the students gathered on the playground, and when Teacher Iruka called roll, he paid special attention to whether Lin Chuan was there.

Seeing that Lin Chuan was still there, he breathed a sigh of relief. After reading Lin Chuan's name one last time, he took out another battle training form and prepared to conduct ninja battles according to the names.

Sasuke, however, couldn't sit still any longer. He interrupted Iruka's call of names, pointed directly at Lin Chuan, and shouted, "Iruka, I want to fight him..."

"Sasuke, you should call him teacher at school," Iruka said helplessly, rubbing his forehead. Sasuke didn't even acknowledge him as his teacher, only staring at Lin Chuan.

"I want to fight him," Sasuke repeated his words again, not wanting to say it a third time.

"Alright, the matchup has been changed. The first match will be between Uchiha Sasuke and Chiba Rinkawa," Iruka finally announced the two names. He was worried that Sasuke might attack his classmate because of his deep-seated obsession, which would require calling his parents again.

"Tsk, Erzhuzi thinks he's all that again. Is it because he learned the Great Fireball Technique?" Lin Chuan sighed helplessly. Erzhuzi really doesn't learn from his mistakes. Hasn't the other side realized the gap between them yet?

Now, aside from his chakra reserves, he has reached the level of a genin, making him someone that current ninja academy students can't possibly mess with.

If he remembered correctly, when Sasuke was seven years old, which was the start of the second semester, the night of the Uchiha clan massacre would arrive. At that time, Sasuke, without family or anyone to guide him, would be no match for him.

It wasn't until the Chunin Exams, after learning Kakashi's Lightning Blade, that Sasuke reached Chunin level. He was able to eat Sasuke for six years, how awesome!

"Battle begin..." Iruka saw the two standing in the middle of the playground and was about to shout "Battle begin!" when he saw Sasuke rush out and it was too late to stop him.

"Go Sasuke! Go Sasuke!"

Before the battle even started, the female fans outside the arena began cheering for Sasuke. Sakura and Ino were the most enthusiastic, competing to see who could shout the loudest.

"This time... I... will definitely defeat you!" Sasuke, with unwavering determination, drew a kunai from his ninja tool pouch and charged at Lin Chuan. The kunai gleamed with a cold light, and it looked like he was going to kill him with one blow!

Lin Chuan was somewhat helpless about this. If he had known it would be this troublesome, he would have skipped class. Facing Sasuke who was rushing towards him, he pulled out four shuriken from his ninja tool bag and threw them at Sasuke.

ding ding ding-

All four shuriken were dodged or deflected by the charging Sasuke, making a crisp sound. Just when Sasuke thought Lin Chuan was powerless to resist and would be captured,

Lin Chuan raised his hand and yanked the steel wire in his hand, causing the four shuriken to fly back and attack Sasuke's back.

"What?" Sasuke instantly noticed the shuriken flying back and immediately used the Substitution Jutsu to dodge it. There were wooden substitutes for students to practice on in the playground.

Tap tap tap tap—

All four shuriken hit the substitute wood, but Lin Chuan pulled his arm again, and Sasuke, who had just left the substitute, was bound to the substitute wood by four almost invisible threads, tied tightly.

Because Sasuke knocked away four shuriken, the moment he passed through the middle of the shuriken, he had already entered the steel cable's encirclement.

Sasuke, who used a substitute to escape, didn't get out of the steel cable's encirclement. The steel cable's encirclement also covered the substitute wooden figure in the playground.

Lin Chuan couldn't possibly have missed this; the moment he threw out the kunai, he was waiting for Sasuke to walk right into his trap.

"Damn it, I still have the Great Fireball Jutsu to use, how can I fall here?" Sasuke struggled desperately, trying to break free of the steel cables binding his hands and feet.

But Lin Chuan would never give Sasuke that chance. Seeing Sasuke struggling so desperately, he guessed that the other party must have a backup plan, but there was no chance to use it.

He raised his hand and pulled again, sending the wooden figure and the bound Sasuke flying towards him. He also rushed towards Sasuke, and the moment they met, he kicked out with a side kick, sending Sasuke flying.

Rumbling--

Sasuke flew backward and crashed straight into a pile of substitute wood, where he collapsed unconscious.

Sasuke ultimately failed to unleash the Great Fireball Jutsu, and Lin Chuan didn't use Water Release either. It was just children playing around; using ninjutsu would be going too far. Besides, using ninjutsu to fight Sasuke would mean all his hard training was for nothing.

After becoming an apprentice of Kosuke Maruboshi, he added physical training to his training, not just running, but also hitting the sandbag, and he also had to practice his fist and foot skills.

Otherwise, just knowing ninjutsu but not being able to fight wouldn't make one a ninja. Otherwise, his side kick just now wouldn't have been so smooth. He learned the power generation technique from Lee.

Xiao Li learned the power generation techniques that he summarized through countless trials and errors. After Xiao Li graduates and becomes Kai's apprentice, he might even get some physical training opportunities. This is the benefit of having a wide circle of friends.

"Sasuke, how are you? Are you alright?" Sakura and Ino saw Sasuke fly out and immediately rushed into the pile of wood to search for him.

In the end, it was Iruka who dragged Sasuke out. Looking at Sasuke, who was covered in dust and dirt, the girls surrounded him, asking questions and offering comfort, but Sasuke just kept his head down and remained silent.

"You guys are so annoying," Sasuke suddenly growled, slowly standing up from the ground. He didn't look at the group of chattering girls, but walked towards the classroom with his head down. No matter how the girls behind him shouted, no matter how Iruka shouted, he didn't turn around.

"This kid has too much pride," Iruka sighed helplessly, no longer paying attention to Sasuke who was leaving, thinking it would be good for Sasuke to be alone for a while.

Then, looking at the victorious Lin Chuan, without even mentioning the Seal of Reconciliation, he announced, "In the first training match, Chiba Lin Chuan wins..."

"Lin Chuan is so annoying! Why did he have to defeat Sasuke? Couldn't he have just let Sasuke win...?"

"Yeah, can't we just let Sasuke win this once? Let's all just ignore him..."

"Okay, I won't play with him anymore..."

"Tsk, kids are just kids after all," Lin Chuan said helplessly as he turned to leave. He had naturally heard the girls chirping crickets, but as an adult, he didn't care about such things. The inner strength of an adult was something these kids couldn't compare to.

There aren't many things that can drive an adult to a breakdown, at least not these kids. Threats like refusing to play with you won't work either.

After leaving the playground, he skipped class again. The training tasks that followed were very intense, and he had to learn physical training, including hitting the sandbag and shadow clone techniques.

He stopped all other ninjutsu training except for the Body Flicker Technique, and used all his chakra to learn the Shadow Clone Technique, hoping to master this cheat-like technique as soon as possible.

Of course, even if he learned it, he wouldn't use it to cheat, since chakra is limited and can't be used for anything if it's divided equally.

However, the Shadow Clone Technique must be learned. The main body can perform some physical training, while the Shadow Clone Technique can perform some kunai throwing and ninjutsu training. Once the Shadow Clone Technique's chakra is exhausted and the memories return to the main body, the training is considered complete. If there is still chakra left, a ninjutsu can be selected from the ninjutsu to continue practicing.

This way, he would have two people to train with, which would be perfect for dealing with his increasing training volume during this period...

In the morning, I refine chakra until I reach my physical limit.

In the afternoon, I throw kunai (a type of Japanese sword) at a moving target 300 times daily, and jog 5 kilometers with a 4-kilogram weight on my legs. [The weight is increased by 2 kilograms every six months.] [Physical training is added, including hitting the sandbag.]

In the evening, I would jog five kilometers with four kilograms of weight on my legs, practice the Body Flicker Technique once a day, and use the Shadow Clone Technique once a day. If I had extra chakra, I would choose a Water Release ninjutsu to practice each day.

This is his new training plan, which is quite intense overall. Once he has mastered the sandbag training, he will need to find opponents for sparring practice, as well as rock climbing, one-handed rock climbing, and other training. The road to training is long and arduous!

Putting down his training logbook, he began another monotonous day, starting with refining chakra...

……

A month passed quickly, and the hot month of July arrived. Summer vacation began, and it was time to play in the water again.

As usual, Lin Chuan was training by the river in his backyard. Naruto, Lee, Shikamaru, Choji and others would come over from time to time. Even Kiba Inuzuka and Shino Aburame came over.

Kiba Inuzuka came with Choji and Shikamaru, and Shino Aburame came here to find bugs. These guys didn't come here to train; they came here to play in the water.

Only Lin Chuan and Xiao Li were training by the river. Xiao Li was the only one who was training all the time. As for the others who were not training, they were assigned to fishing and hunting for wild game.

It wasn't until the afternoon training ended that everyone gathered for a meal. There were seven of them in total, and they all enjoyed the meal together.

Since becoming friends with Lin Chuan, Naruto has experienced the happiest time of his life. Because of Lin Chuan's acceptance, others are not so resistant to Naruto and all treat him as a friend.

As his first friend, Naruto looked at Lin Chuan with genuine joy, and as his second friend, Shikamaru and Choji, he was also happy to have met them.

And then there's Lee, Kiba Inuzuka, and Shino Aburame, who will all be his new friends. He's happier than ever before, and he no longer has the idea of ​​causing trouble at the Hokage Rock. He just wants to play around with his friends, and that makes him very happy.