Naruto: Getting Stronger by Teaching

"Who would've thought, graduating from a teacher's college but not becoming a teacher, only to end up as a teacher after crossing over?" Hanyu Rei sighed in his mind after sorting through his memories.

He felt like he had an inescapable fate with the word "teacher".

In high school, he was considered a good student in art class, so many classmates consulted him, earning him the nickname "Teacher Rei". Then, during university applications, he slid smoothly into a teachers' college, following the advice of his family to choose a school with a strong education program. During university, he earned another nickname "Teacher Rei" while tutoring his roommates.

To everyone's surprise, when Rei graduated, he rebelled and directly became a civil servant, not pursuing a teaching career.

What he never expected was that on his first day at work, just as he entered the office, in the next instant, he crossed over and became a new teacher at a ninja school.

Now his body's name was Hanyu Rei, still called Rei, just with a different surname.

"Sigh, this is not a safe world. There are too many lunatics, paranoids, and freaks, and they're all so strong." Rei sighed inwardly.

Casually observing the office, it wasn't much different from the school office in his previous life, but the casually placed sharp kunai on the desk told him that this was no longer the peaceful kingdom of his previous life.

What made Rei even more frustrated was that he not only had the identity of a teacher but he was also a ROOT ninja.

The original owner was an orphan nurtured by the ROOT since childhood. The reason he became a teacher at the ninja school was because of Danzo's orders, to observe and record the students of the ninja school, paying attention to any geniuses and talents that might appear.

"Under Danzo's eyes, this isn't a good place..."

As Rei pondered how to survive in this dangerous world, a cold, mechanical voice suddenly echoed in his mind, and a transparent blue panel appeared before his eyes.

[Teacher System Activated. Congratulations, you have successfully become a teacher.]

[Teaching classes will earn you rewards. The more outstanding the students, the higher the rewards.]

[You can take outstanding students as disciples for one-on-one instruction. As a teacher, you will receive rewards as the disciple's strength grows.]

[Note: Mutual consent is required for disciple acceptance; unilateral acceptance is not permitted.]

Rei examined the blue panel. Currently, there were only two options: Personal Profile and Master Disciple. Rei clicked on Personal Profile.

[Name: Hanyu Rei]

[Age: 18]

[Chakra: 4300]

[Skills: Shadow Clone Jutsu, Fire Release: Great Fireball Technique, Fire Release: Phoenix Sage Fire Technique, Body Flicker Technique, Leaf Style Liquid Body Technique]

[Evaluation: Among the elite Chuunin, played a slightly larger role in wars as cannon fodder.]

After reading the somewhat painful evaluation, Rei silently closed the personal profile and clicked on the Master-Disciple option, which appeared blank, likely because he hadn't yet taken on any disciples.

Waiting for the bell to ring for class, Rei remembered his first lesson and started preparing to head toward the classroom.

Although he was a new teacher, there weren't many teachers at the ninja school right now, so Rei also became a homeroom teacher, assigned to a class of freshmen.

Glancing at the class list, Rei recognized several familiar names.

There was Kamizuki Izumo, and also Hagane Kotetsu, the future guardians of Konoha.

When Rei saw the name Uchiha Shisui, his eyes lit up. This one was certainly an extraordinary genius.

(AN: OG Shisui should be younger than Kotetsu according to the real timeline so consider this AU of sort.)

Since rewarding teachers for disciple growth required having talented disciples, Rei adjusted his expression before entering the classroom, wearing a sunny and gentle smile.

The classroom at the ninja school was uniquely designed, perhaps to help students in the back rows see clearly; the height of the seats increased row by row.

Rei's arrival silenced the previously noisy classroom.

After all, they were mostly five or six-year-old children attending school for the first time, and most were both curious and respectful towards ninja teachers.

Of course, there were exceptions, such as a purple-haired girl with a single ponytail sitting in the front row who, upon seeing Rei enter, boldly smirked.

"Big brother, you're so handsome. Are you our teacher?"

Rei smiled and nodded in response, "That's right, pretty little student. I am indeed your homeroom teacher."

"Hehe." The purple-haired girl, pleased with the compliment, instantly felt that this blond male teacher was a good person.

Seeing their interaction, the other students also relaxed a lot. Although it was their first day of school, many had heard their relatives complain about teachers being strict.

Rei quickly walked to the podium and wrote his full name with chalk. Then, he turned around and formally introduced himself:

"My name is Hanyu Rei. From today onwards, I'll be your teacher. I am looking forward to working with all of you."

"All right! Sensei, my name is Mitarashi Anko." The purple-haired girl was the first to respond.

With Anko leading, the others introduced themselves to Rei, and Shisui also responded.

Rei felt a bit disappointed when he sensed the silent system. He had hoped to take Shisui as a disciple through this introduction, as it would also acknowledge him as a teacher, but it seemed the attempt was unsuccessful.

Rei didn't show his inner emotions on his face. After everyone finished introducing themselves, he gestured for silence.

"Before we begin the lesson, I have a question for everyone. Do you know how Konoha came to be?"

The classroom instantly fell silent again. Everyone looked at each other, unsure how to respond.

Shisui, who had received education from his clan, knew a bit, but being a reserved child, he wouldn't answer unless called upon.

"It was built by people!" Anko thought for a moment before answering.

"That's correct, it was built by people. However, what you should know is who exactly built Konoha and why it was established." Rei didn't dismiss Anko's answer but continued from where she left off.

"Before the era of ninja villages, there was constant warfare during the Warring States period. Even children as young as you might have had to pick up weapons and fight in those brutal wars, which could erupt at any moment..."

As Rei spoke of this grim history, his voice grew somber, presenting the harsh reality of the Warring States period to the students.

Perhaps because children in the ninja world mature early or because this was Konoha, many children felt the weight of his words, changing the atmosphere in the classroom.

"At that time, two clans stepped forward: the Senju clan and the Uchiha clan." Rei's tone shifted slightly from solemn to impassioned.

"I know, I know! The First Hokage, Hashirama Senju, was from the Senju clan." As Rei mentioned the Senju clan, the students suddenly felt more engaged. They might not know much about the Warring States period, but they knew about the Senju clan.

Shisui heard everyone focusing on the Senju clan and felt a bit disappointed. No one seemed to notice the Uchiha clan, and he couldn't quite understand why, considering both were founding ninja clans of Konoha.

"For the sake of protecting future generations, so that children won't have to wield weapons and fight, the two clans joined forces to create Konoha. Their efforts attracted more ninja clans, eventually ending the Warring States period, and thus we have our Konoha today.

Wherever the leaves of Konoha dance, the fire of our village continues to burn brightly. This fire will continue to illuminate our village and nurture the budding leaves of the future."

Rei's expression turned somewhat solemn as if he were honoring the ancestors.

He thought Shisui would be interested in a teacher familiar with history and the Will of Fire.

"So that's how Konoha came to be. Next time I pass by the Hokage Rock, I'll definitely pay my respects."

"I want to become a Will of Fire ninja too, to protect Konoha!"

The students before had already imagined their ancestors fighting bloody battles to secure their homeland. Their hearts swelled with passion as they vowed to learn from their ancestors.

Shisui's eyes brightened. He felt that this teacher was indeed special and began to develop more interest in the upcoming ninja school life.

Originally, he had planned to graduate early and assist in the police force, as his elders had told him everything taught at the ninja school. Now, it seemed not entirely accurate.

"So, does everyone know how many chakra natures there are?"

"Five! Water, earth, wind, lightning, and fire." A student from a ninja family quickly answered.

"Not quite. There are seven chakra natures: aside from the five basic natures of water, earth, wind, lightning, and fire, there are also yin and yang, two special nature transformations." Rei smiled and corrected them.

Asking questions and then correcting them could leave a deeper impression on the students.

Immediately after, Rei began to explain the basic concepts of chakra, occasionally throwing in a joke to make the children laugh.

Time flew by quickly, and before they knew it, four periods had passed. When the bell for the end of class rang, Rei paused and smiled, "Class dismissed! Tomorrow, we'll discuss chakra refinement!"

Rei announced the end of the class directly and previewed the topic for the next lesson.

When the students heard Rei say "class dismissed," they were momentarily stunned. They thought they had just started class—how was it already over? Upon careful recollection, they realized they had already gone through four periods.

Thanks to Rei's guidance, their class had been both focused and enjoyable, so they hadn't noticed the passage of time.

"Chakra refinement, I'm so looking forward to it!" Anko couldn't wait for tomorrow after hearing Rei's words. Her family wasn't made up of ninjas, so she hadn't been exposed to this kind of knowledge before.

"Isn't class interesting? My cousin tricked me into thinking school was hard to endure. I'm going to tell Auntie about how he stole money to buy snacks." Hagane Kotetsu had a look of almost being fooled

"Then you could just use that to blackmail your cousin into giving you the snacks," said Kamizuki Izumo, expressing his opinion.

Kotetsu instantly looked enlightened and patted Izumo on the shoulder, exclaiming, "Bro, great idea! If it works, I'll split the snacks with you."

Shisui watched Rei, who was about to leave the classroom, and after a moment's thought, he stood up and followed.

[End of class. Proceeding to evaluation…]

[Evaluation: A]

[Effectively stimulated student responsibility and enthusiasm through the storytelling of ancestral tales. Coherent lesson content with strong interactivity. High student satisfaction.]

[Reward calculation...]

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