Senju Tobirama's head grew three times bigger.

This Senju Tobirama refers specifically to Senju Tobirama, the director of Konoha Observatory and a member of the Ninja World Alliance Committee.

Since the unification of the ninja world, the membership of the Alliance Committee has continued to increase, and now it has expanded to twenty-three people. If calculated based on the previous villages, each village will probably have two to three seats.

Small villages such as Takigakure, Yukigakure, and Kusagakure have joined together in twos and threes, and each has one or two seats in the federation. The remaining seats belong to the daimyo of the five major countries, shrines and temples, and wealthy representatives of major chambers of commerce.

After all, ninjas are only a small group of people living in this world, and there are many more civilians, nobles, etc.

As the leader of the first Ninja Alliance, Uchiha Obito has a heavy workload, but fortunately, as a Wood Release holder, he is energetic, and his Multiple Shadow Clone Technique is enough to handle all kinds of meetings and document revisions.

According to the suggestion made by Izawa Sugi before, the term of office of the leader of the alliance is five years, and one person can only serve two terms. So even though many ninja villages have resentment towards Uchiha Obito - it's this bastard who came to our village and released the tailed beast - but considering Uchiha Obito's strength, work ability and term of office, everyone still tends to recognize Uchiha Obito as the leader.

Since Uchiha Obito was doing well, Uchiha Madara was old and too lazy to think about the interests of the ninja clan. His attention naturally fell on the exploration of the starry sky.

The observatory was mainly responsible for studying the science and ninjutsu of the starry sky, so Uchiha Madara had more opportunities to meet Senju Tobirama, the director of the observatory.

The two of them knew each other in childhood. Although they fought each other to death for the first thirty to fifty years, they have cooperated well in the last ten years or so. The past grievances and hatreds have gradually faded away with time.

It just so happened that Uchiha Madara was very interested in the sea of ​​stars that Izawa Sugi mentioned, and Senju Tobirama also had a secret dissatisfaction and regret about the kid who secretly attacked him during the election. So the two of them hit it off and teamed up with Uchiha Obito to track down Izawa Sugi.

What's the result?

They were completely defeated!

The two old veterans who had been powerful in the ninja world for their entire lives were easily tricked by Izawa Sugi, and each of them took a baby home, which made Uchiha Obito have enough of the joke.

Uchiha Madara carried his infant brother back to his clan land, happily enjoying the days of taking care of his brother, but Senju Tobirama's life was not so good. When Senju Hashirama came to Konoha Village and learned about the unification of the ninja world, he was like a husky out of a cage, completely impatient and wanted to wander around the village, trying to understand everything about the current ninja world.

At the beginning, Tobirama Senju was full of brother-control feelings. He took his brother to travel all over Konoha Village and planned to take Hashirama baby to visit other villages such as Kirei-nin. However, on the evening of the third day, after finding Hashirama baby and Tsunade who had gambled away his pay card in the Konoha casino, Tobirama Senju could no longer laugh. He almost overturned the casino with water jutsu.

Senju Hashirama proudly said to Senju Tobirama: "I only gambled away one-third of it! Tsuna lost two-thirds!"

Senju Tobirama couldn't help but pat his brother on the head: "What is there to be proud of, bastard!"

"It was you who said, Tobirama, that I should enjoy a happy childhood and do what I want..."

"That's no reason for you to gamble away all my money!"

Senju Hashirama shrugged his shoulders. He had heard from his future granddaughter, Tsuna, that his cheap younger brother not only had money in his payroll card, but he was also an expert in arranging base station arrays in the entire ninja world. He got a share of the money earned from the operation of each base station. How could his younger brother be short of money?

"Tobirama is so stingy. I only gambled away 300,000 ryo."

This amount of money was an astronomical figure in the Warring States Period, but after observing Konoha's mission assignments, Hashirama Senju realized that 300,000 ryo was just two B-level missions.

Senju Tobirama angrily scolded: "You bet on the big or small and you can lose 300,000 ryo and still think it's reasonable?!"

Isn't betting on the size of a bet just a basic entry-level game that tests one's eyesight and hearing? Tsunade loses every time he bets, so even if Hashirama Senju's luck is bad, it can't be worse than Tsunade's, right?

And the reason why Senju Tobirama was angry was not that his brother spent his money, but that his brother used the money to gamble, almost giving it to the casino for free. Even if Senju Hashirama used the money to eat and drink lavishly, Senju Tobirama could pretend not to see it.

Senju Hashirama muttered something in a low voice, then smiled and said, "Okay, Tobirama, I'm sorry, I just haven't played for a long time, and my hands are a little itchy." He made a pitiful expression, "You know, at home, my dad doesn't let me play this."

After hearing this, Senju Tobirama felt softened. Yes, his father Furuka would definitely not agree to let his eldest son gamble. After discovering his son's bad habits, he would hardly leave any money for Hashirama.

"Come to think of it, I haven't seen Madara and Izuna in the past few days."

Hashirama Senju did not forget that Izuna from the neighboring Uchiha clan was also in this world, and they would definitely go back together in the future, otherwise his friend Madara would be furious.

"The Senju and Uchiha have joined forces here. Can I go to the Uchiha territory to play with them?"

Senju Hashirama looked at Senju Tobirama with bright eyes. This was almost impossible in the Warring States Period, but it should be okay here, right?

Senju Tobirama hesitated for a moment but nodded in agreement: "I'll say hello to Fire Core and we'll go with the transformation technique."

If an ordinary village ninja wants to go to the Uchiha clan's territory to find a companion, he only needs to register with the Uchiha clan member guarding the gate of the clan's territory. If Senju Tobirama goes there directly, it will easily alarm the Uchiha clan leader and elders, so it is more convenient to use transformation technique.

Senju Hashirama excitedly pulled his brother, who had become smaller, to the gate of the Uchiha clan. After registering, he finally stepped into the Uchiha clan's territory.

The layout of the Uchiha clan is similar to that of the entire village, except that there are Uchiha fans painted on the walls, and people coming and going are all wearing Uchiha clan uniforms.

Senju Hashirama looked around and whispered to his brother, "Won't the people in the village enter the Uchiha clan's territory?"

Senju Tobirama looked at Senju Hashirama speechlessly: "Aren't you and I the same?"

As they were talking, a chubby little boy from the Akimichi family and an Uchiha boy walked out of the clan territory together.

Senju Hashirama did not go over, but stood on the side of the road and looked with his head tilted.

The Uchiha and Akimichi noticed them, and probably considering that this was the Uchiha clan's territory, although the two felt that each other was a little strange, they still nodded to the Senju brothers and continued walking forward.

"That's Jing's son." Senju Tobirama retracted his gaze, "The other one should be Qufeng's son. Jing and Qufeng are teammates, so it's normal for their children to know each other."

"That's great..." Senju Hashirama's face showed envy, "Because I trained with Madara, my father even put me in solitary confinement."

He raised his hands and patted his face, his expression becoming serious, "I'm going to work hard!"

Senju Tobirama remained silent.

He didn't know what to say. Intellectually, he hoped that his elder brother could be happy, without having to think about these complicated things too early, and without having to endure anything anymore, but that was just the kind of person Hashirama Senju was.

"I want to be free to make friends with anyone!" Senju Hashirama clenched his fists, "I have to get stronger quickly!"

At least you have to gain the right to speak with Qianshou first.

——This is what Hashirama Senju thought when he heard Tsuna describe how Uchiha Obito controlled the tailed beast to knock out several ninja villages.

Senju Tobirama sighed in his heart.

The ninja's pursuit of becoming stronger is almost engraved in their bones. Well, since the eldest brother is so motivated, then the study and examinations can be arranged. This is what he asked for.

Senju Tobirama smiled gently.

The two brothers arrived at the place where Uchiha Madara lived. Since they had called in advance, Senju Tobirama pushed the door open and walked in directly. Senju Hashirama curiously poked his head in, "Madara! Izuna! We are here!"

Senju Hashirama sensed that Uchiha Madara and Uchiha Izuna should be in the small courtyard behind the house. He ran barefoot on the corridor, but when he saw Uchiha Madara and Uchiha Izuna, his pupils trembled!

Senju Tobirama, who was following behind, said helplessly: "Brother, slow down... um..."

Senju Tobirama looked at the fatter Uchiha Izuna in disbelief, "Madara, are you feeding pigs?!"

In just a few days, Uchiha Izuna turned into a little fat man like a balloon!!

Uchiha Izuna was eating green dumplings like a hamster. When he heard what Senju Tobirama said, he got angry: "You are the pig!"

Uchiha Madara sat cross-legged on the side with a mysterious smile on his face. He watched Izuna's cheeks bulging with food, and the more he watched, the happier he became.

"Don't worry about him. Eat more."

Senju Hashirama nodded in agreement: "Indeed, we should eat more. These past few days, Tsuna has taken me to eat a lot of delicious food, all of which I have never had before. I won't be able to eat them when I go back."

Senju Hashirama ate more than Uchiha Izuna these days, but his body's digestion and chakra refining abilities were stronger than Uchiha Izuna's, and everything he ate was converted into nutrients and turned into muscles and chakra, so he looked the same as before.

The ninja's chakra is refined from the combination of physical energy and spiritual energy. If the physical foundation is good and the mental strength is strong, the refined chakra will naturally increase.

And don’t think that Uchiha Izuna has become a little fat boy because of eating too much. After a few days of high-intensity training, he will be as thin as a bean sprout again.

Uchiha Izuna glanced at Senju Hashirama in surprise. It seemed that the eldest brother of the neighboring rival family was not that annoying.

Then the child smiled proudly at Senju Tobirama.

Senju Tobirama curled the corner of his mouth. He didn't care about the childish dispute of "Your brother also helps me"!

...No! He cares!

So Senju Tobirama said in a gloomy tone: "Ball, big brother just said that he wants to work hard to become stronger. You don't want Izuna to be too weak, right? It's time for tutoring!"

Uchiha Madara looked at Senju Tobirama with a rare teasing look: "Didn't you say that you would let Hashirama play for a few more days?"

But the next second he also agreed with Senju Tobirama's suggestion, "It's time to let them know more about current ninjutsu."

Ninjutsu is constantly improving and developing. During the Warring States Period, due to the control and fortification of the major families, except for families like the Uchiha who have the ability to copy the Sharingan and have a large reserve of ninjutsu, even the Thousand Hands' ninjutsu is a bit crude.

But after the establishment of the ninja village, the ninjas of each family needed to cooperate with each other, and the ninjutsu of each family naturally spread out. As more people learned it, more people improved the ninjutsu and combined it with their own ninjutsu to carry out secondary development of ninjutsu.

Tobirama Senju explained to his brother and former enemy: "Perhaps the high-end ninjutsu is not as good as the previous secret ninjutsu, but the number and application range of low-end ninjutsu have more than doubled compared to the Warring States period."

For example, the Three Body Techniques, the Untying Technique, the Immobilization Technique, etc. taught in the Ninja School. These techniques do not require high chakras, which makes it convenient for Hashirama Senju and Uchiha Izuna to learn quickly.

"Especially mathematics." Senju Tobirama looked at Uchiha Izuna proudly, with an expression that said, "If you don't study mathematics well, you will never be able to go back!"

Uchiha Madara thought about his experience with the Flying Thunder Formation Technique and hesitated: "Just let Hashirama learn it, right? If he learns it, Shan will also learn it, and we can set up a formation to send them back."

In order to bury Uchiha Izuna with math papers, Tobirama Senju did not hesitate to make fun of himself: "Are you sure? Have you forgotten how Izuna was injured?"

Uchiha Izuna died from the Flying Thunder God Technique!

Uchiha Madara looked at Senju Tobirama speechlessly: "...I think you want to embarrass Izuna."

Don't think he doesn't know how painful it was for Uchiha Obito to learn the Flying Thunder God Technique. Uchiha Obito wanted to die even though he had enough talent in space-time ninjutsu. What about Izuna...

"I'm doing this for his own good." Senju Tobirama said seriously, hinting at Uchiha Madara, "Because of this technique, you didn't kill me in the past few times. Don't you want Izuna to learn this escape technique as well?"

Uchiha Madara: "..."

Okay, now do more math papers, and you will have one more life in the critical moment. This choice is not difficult to make.

So Uchiha Madara told his little brother: "Learn well from Tobirama."

Uchiha Izuna: "..."

His expression was slightly distorted. Ahhh, this dead face is still so disgusting!

——Senju Tobirama! You are indeed my lifelong enemy, just wait for me! I can't beat this big one, can I turn around and beat the small one?

Senju Hashirama watched his brother and Madara discuss this scene, and he was excited and full of hope for the future: "I really hope that Tobirama who stayed in the Warring States Period can get along well with Madara."

Uchiha Izuna was very angry. If it were in the past, he would definitely refute Senju Hashirama loudly. How could his brother Madara get along well with such a dead-faced guy like Senju Tobirama?

But after living in this place called Konoha Village for a few days and seeing the bustling village scene, Uchiha Izuna couldn't help but feel a little longing. The children in this village were all playing happily, and no one went out on a mission early. Their biggest worries were who the girl they liked smiled at, and who they lost the ninja game again today.

Moreover, it seems that the relationship between Madara-kun and the wrinkled-faced Tobirama is good. Maybe... maybe in the future the Senju and Uchiha will really unite again to establish the Konoha Village?

But the Senju are his enemies. They killed many Uchiha clan members. Two of his three brothers died at the hands of the Senju. Whenever his father mentions the Senju, he will glare at him with his Sharingan. Is this really okay?

The little Uchiha Izuna slowed down his eating of the green dumpling. He moved his lips and couldn't help asking the wrinkled-faced Senju Tobirama: "Hey, do you really want to teach me? Aren't you afraid that I will kill you when I get back?"

Senju Tobirama was discussing the teaching content with Uchiha Madara. Hearing Uchiha Izuna's words, Senju Tobirama said with a strange expression: "No way? You don't think no one taught me when I was a child, do you?"

He said modestly: "Although Shan is under the name of Banhe, he is actually the child I raised."

"He will teach me all the ninjutsu he knows. Izuna, no matter how hard you try, you will still be beaten by me when you go back."

Uchiha Izuna: "..."

Ahhhh, that rubbish Senju Tobirama! What Senju and Uchiha alliance? Bullshit! With him around, it's impossible in this lifetime! I'll kill this bastard when I get back!

Besides, that kid named Asuga has Sharingan, and he is obviously an Uchiha, but it turned out to be a Senju!

Uchiha Izuna glared at Senju Hashirama fiercely: "You are going too far, Senju Hashirama! I will remember this!"

Senju Hashirama: “…”

He fell into extreme depression and despair.

Oh, he doesn't even know Yang Release, let alone using Yin-Yang Release with Madara to create offspring. How could he be going too far?

Upon learning that Hashirama Senju and Izuna Uchiha were about to plunge into the bitter sea of ​​Flying Thunder God Technique, Uchiha Obito generously contributed all the materials and papers he had used to learn the Flying Thunder God Technique.

"I'm telling you, there is a shortcut to learning this technique!"

Uchiha Obito smiled and shared his experience with Senju Hashirama and Uchiha Izuna, "First, you must master the technique of Flying Thunder God, then perceive space, and finally have strong control over space."

Senju Hashirama thought for a moment: "Shan also said that to learn this technique, one must have the talent to perceive space, but what is spatial control?"

Uchiha Obito: "It's just blurred vision."

Uchiha Izuna understood immediately: "This is the same principle as the Uchiha family's shurikens throwing. If you want to throw the shurikens to every corner, you need to calculate the spatial trajectory."

"That's right! The Uchiha family's secret technique can assist in learning the Flying Thunder God Technique."

Uchiha Obito urged the two of them, "Go find Madara and let Madara use illusions on you. Experience the feeling of Flying Thunder God in the illusion first, which can enhance your perception of spatial positioning."

Uchiha Izuna immediately went to find Uchiha Madara excitedly, but Senju Hashirama's expression was a little subtle.

If he remembered correctly, Asan seemed to have mentioned that Madara wouldn't know this technique, right?

This was indeed the case. Facing his brother Izuna who looked at him with admiration, Uchiha Madara curled his lips, flattened his sleeves, stood up, and pulled out a sickle: "Wait a moment, I'll go beat up Obito first."

Looking at Uchiha Obito who was sometimes hollowed and sometimes hit on the training ground, and then looking at Uchiha Madara who was furious, Uchiha Izuna was very surprised: "Brother Madara doesn't know this technique?"

Senju Tobirama said complacently: "Yes, this is a technique to test one's intelligence. The fact that Uchiha Madara can't learn it shows that he..."

Before he could utter the word "stupid", a light blue Susanoo sword came smashing down. Tobirama Senju rolled his eyes, used Flying Thunder God, grabbed the baby Hashirama and the baby Izuna and left the spot.

"…which shows that he has no spatial talent."

Senju Tobirama modified his wording, Uchiha Madara glared at Senju Tobirama with anger, and retracted Susanoo.

Uchiha Obito was lying on the ground in a spread-eagle position, seemingly having been beaten badly.

"Get up! Stop pretending, I didn't hit you at all!"

Uchiha Obito's ability to transform into a hollow form is superb. If he were to attack in this training state, even Uchiha Madara would find it difficult to catch Uchiha Obito.

Senju Hashirama recalled the scroll that Shan had shown him before, and couldn't help but ask Senju Tobirama: "The scroll you showed us seems to be different from the scroll Shan showed me."

Uchiha Madara: "Indeed, they are different. He showed you the Flying Thunder Array Technique, and Tobirama taught you the basic Flying Thunder God Technique."

"The Flying Thunder Array is a technique used to transport people and objects, while the Flying Thunder God Technique can be used to fight and escape. It is more convenient and easier to use than the Flying Thunder Array Technique, but also more difficult to learn."

Senju Tobirama followed up by saying, "Yes, although Madara doesn't know Flying Thunder God, he can use the Flying Thunder Array to launch a compound ninjutsu. To be more precise, he has developed a super S-class fire ninjutsu that combines fire ninjutsu and Flying Thunder Array, which is powerful enough to destroy the world."

So, following the Flying Thunder Array Technique, Senju Tobirama explained to the two of them the basic principles and effects of the chakra network and the basic materials needed to construct a chakra network.

Senju Hashirama was fascinated by what he heard.

Tobirama and Madara actually captured the nine tailed beasts as chakra power, built base stations all over the world, used the planetary belt and the moon as the carrier of the operation, and built a large chakra network that can be transmitted to any place in the world at will...

At this moment, a strong desire called ambition ignited in the heart of Hashirama Senju.

He also wants to do this, he must do this. His brother and Madara can do it, why can't he?

Uchiha Izuna didn't think too much about it. When he heard that his brother had developed the Fire Release Ninjutsu, he immediately asked excitedly, "Can I learn it?"

Uchiha Madara touched his brother's head and said softly, "Okay, I'll teach you."

Uchiha Izuna glanced at Senju Tobirama proudly again: "This is Madara-kun's technique, even that Asuga wouldn't know it!"

Senju Tobirama snorted and said with equal pride: "Bara gave him all of your Uchiha fans, so of course he knows all of the Uchiha techniques."

Uchiha Izuna looked at his brother in shock. Uchiha Madara pinched his brother's cheek in amusement and glared at Senju Tobirama as a warning: "Shan is a descendant of the Six Paths. He also knows the Uzumaki technique. He is a very powerful guy."

Senju Hashirama asked curiously, "What technique do you think he will teach Tobirama?"

Senju Tobirama thought for a moment and said uncertainly, "There must be a Flying Thunder God, right?"

This is a technique he developed, you should be able to learn it right away!

What is the reality?

By the small river of Nanga River, Izawa Sugi, Senju Tobirama and Uchiha Madara gathered together and started a small class to learn ninjutsu.

Baby Tobirama and Baby Madara were sitting three meters apart, and Izawa Sugi was standing in the middle with a serious look on his face.

"This is a technique that all ninjas in Konoha must learn. Look carefully, this is how you make the hand seals."

Izawa Sugi slowed down the seal-making speed so that Uchiha Madara and Senju Tobirama could see the sequence of seal-making clearly, and then said: "Diffuse the chakra throughout the body, imagine the target in your mind, and then release it all at once."

"Konoha's Secret Art: Harem Technique——!"

The Naruko girls who look like Naruto are posing and flirting, with a soft white light protecting them.

Senju Tobirama: "..."

Uchiha Madara: "..."

Senju Butsuma and Uchiha Tajima, who were hiding in the dark just in case, both had nosebleeds, and Langxiong fled the scene.

Izawa Sugi put away his ninjutsu without a care in the world, and said proudly: "See, neither of your fathers can match this move! This is a strong control ninjutsu, it's super useful!"