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

Ninja Academy, second year, the second semester has begun.

Lin Chuan was quite excited today. He got up very early, ate breakfast, and went to school.

After all, it had been more than half a year since he had seen those adorable classmates who would cry for a long time if they were pinched even once, and he really missed them.

When he arrived in the classroom, everyone's attention was drawn to him. Even the girls ignored Sasuke and stared at him intently.

"Oh my god, Lin Chuan is in class?"

"Am I dreaming? Lin Chuan really came to class..."

"Lin Chuan?" Sasuke saw Lin Chuan appear and his fists clenched involuntarily, then he quickly relaxed them. Even if Lin Chuan appeared, it was meaningless now.

"Lin Chuan, you're back?" Naruto was most excited to see Lin Chuan. He didn't expect Lin Chuan to come back and shouted out loud.

"This guy's back, and he's become interesting again," Shikamaru couldn't help but laugh when he saw Lin Chuan, who had gotten quite tanned. Now he could finally ask his dad where Lin Chuan had been.

Lin Chuan returned to his seat, and everyone looked at him with surprise, curiosity, and doubt, wondering where he had been all this time.

However, all eyes turned to Iruka after he entered the classroom, and the class began.

As the morning classes began, Lin Chuan also started refining his chakra. This was his daily routine without fail. Even during the two months he trained with Maruboshi Kosuke, he would refine his chakra every morning and take the opportunity to organize his gains during that time.

[Kunai throws, 722,300 times]

[E-rank Ninjutsu, Transformation Technique, 1370 uses]

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

[Rank E Ninjutsu, Substitution Jutsu, 1660 uses]

[D-rank ninjutsu, Body Flicker Technique, 1990 times]

[C-rank Ninjutsu, Water Release: Water Clone, 525 times]

[C-rank Ninjutsu, Water Release: Water Chaos Wave, 400 times]

[Rank B Ninjutsu, Water Release: Water Wall, 42 times]

[Rank B Ninjutsu, Water Release: Water Dragon Bullet, 55 times]

[Rank B Ninjutsu, Shadow Clone Technique, 124 times]

[Rank B Ninjutsu, Water Release: Heaven's Cry, 36 times]

[C-rank Ninjutsu, Water Release: Water Prison Technique, 28 uses]

[Rank A Konoha-style swordsmanship, Crescent Moon Dance, 13 times]

Three months have passed since then. I've used Kunai Throwing, Instantaneous Movement Technique, and Water Prison Technique a lot, mostly during the half-month I spent in the Forest of Death.

Later, he went out to train with Maruboshi Kosuke, and spent more than two months learning the Konoha-ryu swordsmanship, the Crescent Moon Dance.

That's right, the sword technique he learned wasn't Konoha Ryuu, because it's an S-rank sword technique, a composite sword technique that combines illusion and swordsmanship. He has no foundation in illusion techniques, so he simply can't learn this technique.

Maruboshi Kosuke, as a second choice, taught him the Crescent Moon Dance and told him that there was a top-tier derivative sword technique of this move, also S-rank, called Secret Sword Moon Shadow.

The Dance of the Crescent Moon is based on coordinated attacks using shadow clones, launching surprise attacks from three directions (left, top, and right), emphasizing combined attacks and strikes from blind spots.

Secret Sword: Moon Shadow emphasizes using extreme speed and afterimages to confuse the enemy. The user teleports and rushes in like a "moon shadow," killing with a single blow. It focuses on high-speed single-target slashes and is similar to Shisui's Instantaneous Movement Technique, but a lower-end version.

His biggest gain this time was not this sword technique, but that Maruboshi Kosuke helped him make up for his shortcomings in taijutsu, swordsmanship, and combat experience, so that, apart from the amount of chakra and the size of his body, he could now rival a true Chunin.

There are also two ninjutsu brought from Root: Water Release: Heaven's Cry and Water Release: Water Prison. In addition, there are the ANBU uniform, ANBU ninja tools, armor and short swords. All of these were obtained from Root. All the suffering was worth it.

The ninjutsu he has learned so far is enough for him to become a Chunin. He just needs to calm down and slowly refine his skills. Once he graduates from the Ninja Academy, he will naturally have the chakra reserves of a Chunin.

However, he hadn't forgotten that Maruboshi Kosuke still had two A-rank ninjutsu and one S-rank sword technique he hadn't learned. He would spend two or three years learning them before graduating, and he was determined to learn all of Maruboshi Kosuke's ninjutsu.

The morning classes ended quickly, and it was lunchtime. He handed Naruto his lunch again, and while Naruto ate, he started asking him all sorts of questions, inquiring about where he had been all this time.

He didn't mention the training and tasks at the root, but said that he went out to cultivate with his teacher. Then he talked about some interesting things that happened during the cultivation. The lunch break passed quickly, and it was time for the afternoon physical education class.

He didn't skip PE class this time. After all, he hadn't seen Naruto and the others for a long time. Even if he wanted to skip class, there was no need to rush. He could adjust to school life first.

This afternoon in PE class, Iruka only had everyone run one kilometer, and then they played ninja games or other small games like ball games.

Lin Chuan wasn't particularly interested in this, and just sat with Naruto and the others chatting and bragging.

Suddenly, out of the corner of his eye, he noticed that a child was actually skipping school by climbing over the wall. Usually, only this child liked to climb over the wall, but now there was another one. How interesting.

"I'm going to the restroom," Lin Chuan said goodbye to Naruto and the others, indicating that he needed to go to the restroom. He then quietly went back to the classroom, grabbed his schoolbag, climbed over the wall, and left the ninja academy, chasing after the children who had just left.

He knew who the child who had just left was. Now that child was all alone except for his older brother, his enemy, it was the perfect time for him to bully his younger brother.

Following Uchiha Sasuke into the forest, they arrived at the riverbank. There, he saw Sasuke throwing stones into the water and went directly to the other side to mock him, "Yo, long time no see, Sasuke..."

"If you laugh again, I'll tear your mouth apart!" Sasuke was in a bad mood, and seeing this annoying guy again, he couldn't help but shout angrily.

"Come on if you dare, you defeated opponent," Lin Chuan wanted to provoke Sasuke. That was his original purpose; otherwise, how could he beat up his brat?

"Damn it," Sasuke thought, as he heard about his defeated opponent. Unpleasant memories of the past flooded back. His father's coldness and ruthlessness, his father who only cared about the family's honor, how he didn't want to see him. He had never received his father's approval. But his parents were no longer with him.

All the grievances welled up in his heart instantly, and fueled by anger, he jumped over the river and punched Lin Chuan in the face, but instead of punching, he splashed water.

boom--

The instant Lin Chuan's water clone was destroyed, he rushed out of the bushes and delivered a side kick. Sasuke was sent flying backward, crashing into a tree trunk with a loud bang. The impact was quite severe.

Then he raised his hand, took out a kunai, and threw it at Sasuke.

Sasuke was stunned as he stared at the kunai piercing his heart. He instinctively rolled away to dodge, knowing that he would die if he didn't. He never expected his opponent to actually try to kill him.

Just as Sasuke was rolling over, he saw a foot kicking at him, sending him flying. He only had time to raise his hand to block before he was sent flying backward as well.

Before he could even stand up, a foot landed on his chest, and a mocking voice rang out again: "Are you really an Uchiha? Or are you a fake Uchiha? Such a weak Uchiha..."

"Damn it," Sasuke reached out and pulled out a kunai, aiming it at Lin Chuan's calf.

As Lin Chuan jumped up, he threw a kunai at Sasuke on the ground. Sasuke dodged it again and charged at Lin Chuan.

The word "weak" stung Sasuke's nerves once again. He wanted to kill this guy, but things didn't go as planned. Sasuke was no match for Lin Chuan. Lin Chuan beat Sasuke, who hadn't opened his eyes, as easily as playing with him.

bang bang bang-

Sasuke kept charging forward, only to be kicked away repeatedly. After more than ten times, Sasuke could no longer hold on, his anger dissipated, and he collapsed to the ground, panting heavily. He simply couldn't get up.

"Oh, you can't handle this? Isn't the Uchiha supposed to be a genius? How come you're out of breath after just a few steps?" Lin Chuan walked over again, looking at Sasuke on the ground and continuing to mock him. He couldn't give this brat a good look.

This time, Sasuke didn't get up. He just turned his face away from Lin Chuan. Even if Lin Chuan wanted to kill him, he didn't care. He didn't want to resist anymore. He didn't care about the glory of the Uchiha either, because the Uchiha was gone.

Seeing that Sasuke had stopped resisting, Lin Chuan felt it was about time. He put away his smile and asked Sasuke, "I heard that your brother killed the Uchiha clan. That's really impressive..."

Upon hearing the murderer's name again, Sasuke wanted to get up and attack Lin Chuan, but he was in pain all over and didn't have the strength to get up. He could only glare at Lin Chuan, not understanding why Lin Chuan did this.

"Do you know that? You're too weak. You can't even beat me. How are you going to avenge your family, avenge your mother...?"

"Yes, I'm too weak. How can I take revenge?" Sasuke couldn't help but cry when he thought of this. He cried when he saw his brother kill their parents, and he hadn't cried since then.

But he was too weak. Because he was too weak, he cried, pathetically, for his own weakness.

"You don't know how strong your brother is, do you? Your brother is a Jonin, a genius Jonin of our Konoha Village. Your brother graduated from the Ninja Academy at the age of seven with the reputation of a genius, and passed the Chunin Exams on his own at the age of ten, becoming one of the youngest Chunin in Konoha history. Now he has become a Jonin."

"You should know that Iruka-sensei is only a Chunin, while your brother is a Jonin. You're just a student at the Ninja Academy. Do you understand the difference now? You'll never get your revenge in this lifetime..."

"No, I want to become stronger, I want revenge, I can become a Jonin too!" Sasuke roared angrily upon hearing these words, glaring at Lin Chuan.

"Impossible. You can't even beat me, yet you want revenge?" Lin Chuan mocked without reservation. Sasuke was lacking in motivation at this moment. "Your brother graduated from the Ninja Academy at our age, and you're not even a genin."

"I will defeat you," Sasuke knew his weakness. He was indeed no match for Lin Chuan right now. Ever since they started school, he had always been the one being suppressed by the other. But how could he possibly admit defeat?

"Alright, I'll wait until you defeat me," Lin Chuan finally laughed when he heard Sasuke say that, and stretched out his palm towards Sasuke who was lying on the ground.

"Hmph," Sasuke did not refuse Lin Chuan's kindness. He reached out and took Lin Chuan's hand to get up, intending to go home and change his clothes.

"Let's go, I'll treat you to Ichiraku Ramen," Lin Chuan said, retracting the kunai he had just used to attack. He had already left Root, and now he had to buy all the kunai.

"You'd be so kind?" Sasuke was still somewhat incredulous. Lin Chuan, who had just mocked him, acted ruthlessly, and even planned to kill him, was actually treating him to Ichiraku Ramen.

"Don't think so badly of people. We're classmates after all," Lin Chuan said with a smile, waving to signal the other person to follow him. The two of them headed to Ichiraku Ramen together.

The Anbu members who witnessed this scene were amazed. They never expected that Lin Chuan would actually subdue Sasuke, persuade him, and help him out of his depression and confusion. He really knew how to enlighten people.

"Captain, Itachi's younger brother has made a new friend." The Anbu members looked at Kakashi wearing the fox mask. Now, Kakashi is the only one in Konoha who still has the Sharingan. They have already guessed who Kakashi will be mentoring after leaving the Anbu.

"Shut up, it's mission time now, follow them," Kakashi sensed that the team members were a bit relaxed, and that they would go back to continue their extra training after the mission was over.

……

At Ichiraku Ramen, the ramen shop owner, Uncle Teuchi, already knows Lin Chuan because Lin Chuan often comes here with Naruto to eat ramen. Last time, on Naruto's birthday, Lin Chuan even treated Naruto to ramen.

"Hey, Ogawa, it's your treat again today," said Teuchi, who was making two bowls of ramen, one for Rin and one for Sasuke.

"Yes, I'm treating my new friend to ramen. Uncle Hand-Strike, please add extra noodles. I've been training a lot lately and I'm starving," Lin Chuan said with a grin, putting his arm around Sasuke's shoulder. However, Sasuke was still a little reserved and couldn't quite get used to this overly friendly friend.

"Okay, please wait a moment," Tate quickly brought over two bowls of ramen with char siu along with his daughter.

"Eat quickly, it won't taste good if it gets cold," Lin Chuan said, not caring about anything else when he saw the ramen being served. He picked up his chopsticks and started eating, as he still had training to do later.

Sasuke was slightly taken aback when he saw how unseemly Lin Chuan was eating. It was as if he was meeting this person for the first time. He was completely different from his previous behavior. No wonder he could play with Naruto and the others.

Since it was his friend's treat, he picked up his chopsticks and started eating noodles, wolfing them down as well, because he hadn't had such a satisfying meal in a long time.

Lin Chuan caught a glimpse of Sasuke eating noodles out of the corner of his eye. Sasuke had accepted his kindness, so things would be much easier from here on out.

As the reincarnation of Indra, Sasuke could not possibly be inferior to any Uchiha, including his brother, Itachi Uchiha.

Itachi Uchiha was just older, and both of them were geniuses. Moreover, Itachi had the guidance of a genius like Shisui from a young age, while Sasuke lost his family at a young age. So Sasuke was actually wasting his talent when he was young.

If Sasuke makes good use of those six years at the Ninja Academy, he could easily become a Chunin before graduating and a Special Jonin after awakening his Sharingan. He could even give Orochimaru a surprise. The only question is what Sasuke will choose after the Chunin Exams.

But then he wouldn't be able to beat Sasuke, because his limit is only that of a special Jonin, and his chakra reserves are a weakness that prevents him from becoming stronger.

"Are you full? If you are, let's go home." Lin Chuan put down his chopsticks and patted his stomach with satisfaction. The ramen here was a bit expensive, but the portions were large and filling, which was really great.

"I'm full," Sasuke put down his chopsticks. Hearing that he was going home, he realized that no one was home anymore, as he had moved out and was now living alone.

"Alright, see you tomorrow," Lin Chuan jumped off the stool and headed towards his home. He knew that the Anbu were monitoring Sasuke at this time, but what did it matter? He was still just a child!

"See you tomorrow," Sasuke said as he arrived outside Ichiraku Ramen, watching Lin Chuan's disappearing figure. He suddenly laughed, thinking to himself, "He really is a weirdo. It feels good to have friends..."