Reborn as Naruto's older brother

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I have now made up my mind. I will NOT do harem in this world!!!! Full stop! This world is to be used to the maximum for my progression! Harem can be made in other worlds. But here I've decided only to pump! Why did I decide that? Because Itachi, the fucking genius, is getting stronger so damn fast! And I'm thinking about hot chicks! Yeah, I got conceited thinking I'm better than Itachi. When he wasn't training, he was outclassed by one or two. And when he started, he was almost on top of me! Of course, I'll beat him now, but if things keep going like this, he'll beat me like Chunin Genin in a year. Well, that's possible. But I don't even want to think about that! So we'll have to step it up. I've already mastered shurikenjutsu to the point where I can redirect one with the other. So I can redirect the trajectory of one kunai or shuriken about 10 times at most. And even without Sharingan! You can develop your vision and reaction without it. But it will take much longer and be much weaker than Sharingan. That's what my father told me. He has a cheater's reaction! I think he can even rival Fugaku with his eyesight on. And Minato knows he has Mangekyo. He and Fugaku are friends almost as much as Naruto and Sasuke were after the War. So he knows a lot of his secrets. And the fact that Minato has Mangekyo-level reactions is also understandable. He trained it to use his main trick, the Thunder God. After all, to quickly orientate yourself when you're literally in a different place in a split second, you need to react as fast as the Uchiha's eyes do. And the anime showed how quickly he adapts. The same fight with the future Raikage and Bi showed how fast he reacts.

So, my father's been training my reactions. He had already shown me the Thunder God technique and was using it to train me. With Kenjutsu, it was much more complicated. Neither of my parents wielded a blade, only a kunai. I wanted to ask Fugaku for a lesson, but I quickly dismissed the idea. He's the head of the clan, and he already has a son to train and a pregnant wife to take care of. So I decided to leave that for the future. Other than that, I've pumped up my control a lot. I can start learning techniques now. And my mum understood that. She then gave me a scroll from the family vault and started teaching me the reincarnation technique. By the way, our family had a vault of knowledge. There's a hell of a lot more scrolls in there! And all of it was supposed to be given to Naruto in canon. Hiruzen, the bastard, took all the family's knowledge from the kid. There's even a Thunder God technique and a bunch of Fuinjutsu-based techniques! Of course, mum's an Uzumaki and dad's a Biju! The Thunder God Technique is also a Fuin-based technique. And the Third One took it all for himself! You bastard!!! I'll kill that bastard!!! As soon as I get the chance! In the meantime, we'll learn everything we can. Mum showed me all the basic techniques I can learn. And pointed out the section in the vault that has scrolls on those techniques. She's also teaching me Fuinjutsu. It turned out to be VERY difficult to learn! Learning-writing Fuin is like learning drafting, maths and programming combined! I was really shitty at it at first!

That's what I thought. But I was doing better than when my dad started Fuin by himself. Then again, my mum said it was because I was more Uzumaki than Namikaze. But I still think I'm doing badly. And I'm about 7-8 months away from having Naruto, which is not good at all. I can't even learn one hundredth of Fuin's knowledge like that. That's not all of it. Mum got it from Mito Uzumaki, wife of the First Hokage, Hashirama Senju. And she said that the clan itself, at the time of her greatness, had much more knowledge. And she was only able to master a fraction of it. But there are still scrolls in that direction in the vault, so I can probably continue learning on my own later. And when I have enough opportunities, I'll find the rest of the lost knowledge as well. By the way, the department I was allowed to study also included the Shadow Cloning technique. I don't understand why, since it's a forbidden technique of the Second. Although, the Thunder God is also one of those, so it could be considered my father's personal collection. There were also elemental techniques in there. My affinity went up quite a bit, and my basic elements are Fire and Wind. So once I'm done with the basic academy techniques and shadow clones, I'll start using fire and wind elemental techniques. By the way, raising the affinity with the elements was surprisingly easy. It takes more understanding of the element. I learnt it the hard way. I burned myself. And I noticed I had a higher affinity for fire. It worked differently with wind. I couldn't just stand in the wind and get a higher affinity with it. So I decided to do it in a different way. I started converting chakra into air. This succeeded with great difficulty. At first, I literally spent hours huffing and puffing at it, to no avail. Then I tried to create a gust of wind right away. And then it started to work. At first it looked like I wasn't releasing wind, just chakra, but then it started to look like little gusts of wind. That's how my affinity for it was rising. I wanted to swing lightning too, but after my first attempt..... to stick my finger in the socket, my mum told me off. After that, I decided I'd concentrate on my core elements for now. As I got older, the affinity itself picked up, but very slowly.

So, within a month I had mastered the reincarnation and cloning techniques. But I only had 10 clones, which is not a small number, but Naruto in the canon could summon a thousand, so I want to increase the number of my clones. I've always been interested in interacting with a clone, by the way. And the first day I was able to summon clones, I tried to talk to them. I even wondered why they all followed the orders of the original, and I wanted to get a feel for how the clone experience would translate to me.

- So, dear clones, who are you? И... -but I was not allowed to continue.

- Wait! One of the clones interrupted me. Why is he the only one? I don't know! The others were silent, as if they knew what he was going to say, and agreed in advance. Firstly, we are you. We have no differences. Character, behaviour, memories and so on and so forth. Secondly, we also have nothing extra. One of your assumptions was that we were from other worlds, or clones, but we seem to be just copies of you. Like when you copy a folder or pictures or something. Thirdly, the reason we obey your orders is because we need to. Because even though I feel like I'm a clone, at the same time I know I'm the same original. Fourthly, I do even disgusting work for the same reason. Because I need to. Now, there's something I need to check.-and after folding the seal, the clone dispelled. I got the clone's full memory and also its thoughts and sensations of reality. And then, after a few seconds, the other clone started talking, thinking rather than telling.

- So, just like the original, the other clones get the full range of feelings experienced by the clone. Accordingly, there's no reason to make the clone do the work you don't want to do. Because you're going to get the same feelings anyway. Hmm, how about this?" and closing his fist, the clone punched another clone standing next to him. It dissipated, and the clone continued. "The pain, although it's felt, is not the same as if the original me had been hit. That's why Naruto didn't feel his clones' pain when he dispelled. I know that the clone was dispelled by a punch, but the punch didn't hurt the body and was only manifested by the knowledge that the clone had been hit. Fifthly, after dispelling clones, it's like they merge with everyone else, so it's silly to fight for independence, because we all don't feel dead or disappeared after merging.

It's like that. I didn't talk to the clones any further, because it was useless. They responded as I expect them to, and it was no different than just talking to myself. If a clone were to exist longer, it would already be a normal dialogue. So I just sent them off to train. They, by the way, were fine with me not training myself at all. Most likely because they knew what I would be doing. Namely, nothing. I needed to see what kind of experience the clones were giving me. After a few days of doing nothing, I realised that training with clones was much more effective. Well, I already knew that. From there, my progress became faster. Now my maximum is 45 clones, and after that I run out of chakra. Still, my reserve is very large and I can afford it. After that, I trained illusory clones. And it was worse. It took longer to master the illusionary clone technique. Well, that's if you add up my and the clones' training time. Otherwise, it took about a week. By the way, I only used 20 clones for training, because after training and dispelling forty clones, I was too exhausted. 20 was the most optimal number. But for combat, you can use the whole number. They'll disperse quickly anyway. Well, the illusory clones were more difficult because I have to control them all! So I can only hold ten at the most right now. They take less chakra, so I can create more than a hundred of them in total, and that's the limit of my reserve, but they'll be immobile, or at most, they'll perform the simplest of actions. But the technique itself is very useful. A dojutsu wielder can figure out who's real and who's illusory, or just a smart guy who can see the footprints and dust under the opponent's feet. I also experimented with reincarnation techniques. The conclusion was simple, Einstein was right, imagination is more important than knowledge. The better you imagine the person you want to reincarnate, the better the technique. Once reincarnated, the look is solidified. But a bump, cut, or other injury or a trivial chakra dissipation will disrupt the technique and you will revert to your original appearance. There are limits to height. You can reincarnate into a person bigger or smaller than you by 2-3 times, but that's the limit. It's because of the limitation in the amount of chakra. So you can't reincarnate as Biju. That makes sense, though. If it were possible, a single Genin would destroy the entire village just by taking on the form of a Tailed Tiger and smashing everything around him. I have more reserve, but I can't become a giant. By the way, my chakra reserve, thanks to training, has also increased, as well as my life points. But my mana didn't change much. I didn't have any skills, but all the chakra-based techniques I learnt were added to the techniques section. It mentions the amount of chakra required for the technique, a description of the technique, and the level. I'm still at a beginner level, but it won't be hard to level up. These are all my achievements. I trained every day, in my spare time doing Fuinjutsu and studying shinobi history. Mum didn't go on missions and helped me a lot. It was about half a year until Naruto was born. And then...

***

I watched my father, remembering to keep an eye on each kunai scattered around the range. Then folding the seals...

- Shadow Cloning Technique!" I shouted, and twenty of my copies appeared around me. My father only smirked and stood in a stance, ready. Each of my clones lunged at Minato, trying to hurt him in some way. But Father kept moving around the range, dispelling my clones one by one. I watched him and waited for the right moment. It finally came. There were still 5 clones left, and when my father dispelled one of them and disappeared, I threw some shurikens at the place where one of his kunai was lying. As I expected, he moved to that spot and in the blink of an eye repelled each of the shurikens I threw. But during this time, one of the clones had crept up behind him and was one step away from piercing him with his kunai. When the kunai in his hand touched my father's jonin waistcoat, he threw the kunai in his hand upwards and moved towards him, dispelling my clone. Next he dispelled the others as well, after which we clashed in Taijutsu. He parried all of my attacks, while I countered with more and more attacks. And when I seemed to see a gap in his defence and wanted to strike as hard as I could, he parried that too, and then sent me flying with a single blow. I hit a tree and slid down. My father walked over to me and smiled, holding out his hand to me. I wanted to reach out my hand in return, but suddenly there was a creepy YAKI from behind my father's back! Father noticed it too, and sweat dripped from his forehead.

- Minato, I told you to go easy on Menma. Aren't you getting a little carried away? Do you like hitting your weak son so much? Do you want to DIE?!!!" said Kushina, standing behind Minato, in a low, grave voice. Her eyes were gloomy, and her hair, like a fox's tails, was fluttering in different directions, radiating bloodlust!!!!

- It's not like that, darling! W-we were just training.

- JUST TRAINING?! YOU ALMOST KILLED YOUR SON WITH JUST TRAINING. HE'S ONLY FIVE YEARS OLD!!!! HE HASN'T EVEN BEEN TO THE ACADEMY YET. AND YOU'RE GIVING HIM A FULL SPARRING SESSION?!?!!!! WHAT IF HE BROKE SOMETHING?!!!! WHAT IF HE GOT A CONCUSSION?!?!??? you would have to answer for that with your head, do you understand me?!!!!- holding Minato by the scruff of the neck with one hand and beating him half to death with the other, Kushina shouted...(-gulp)...and Kushina is still scary!!!! For the umpteenth time, I assure myself that it's absolutely forbidden to hurt her! She's pregnant and still beating Minato like a snotty Genin. Is Father fainting, or is he faking it? But I'd better get out of here so I don't get in the hot seat. So I left my father to my mother's tears.- I'm sorry, father, but you can't change mother's mind in this state," I shouted, causing Minato to sigh. He was faking it, you bastard! I decided to take a walk around Konoha. People treated me with respect, as the Hokage's son, but I was disgusted by it. Behind my back they called me a spoilt brat who got everything at the expense of the Fourth. Some children, seeing the reaction of their parents, came up to me later, thinking that I was weak and achieved everything at the expense of my father's position. I didn't want to get involved with them at all, but when they started a fight, I'd break the nose of the main one and the others would run away. It's strange that when they're kids, they do that already. But it just goes to show how ugly people are sometimes. Of course, not everyone did it. Most people just didn't pay attention. But there were freaks like that. After the walk, I went to Hokage Mountain. I liked the view from here. I especially liked sitting on my father's head. As it started to get dark, I noticed a dim glow on the Second's face. I was surprised, and waited for the Shinobi to come to see what it was. But no one showed up. It was very strange, because from the main "Hokage Tower" you could easily see that light. I walked over and realised that the light was coming from the eye of the 'Second'. I slowly reached in there and examined a rusty.... key? It was stuck in the pupil of the statue. I picked it up and the light faded. A notification window popped up in front of me.

Congratulations!

You have found the dungeon key.

Dungeon key: "Fenrir."

Activate the key and follow the red arrow, which will lead you to the dungeon.

Key validity time: 23:59:59

After reading the scattered notification, I nearly fell off the statue. No, I did fall off. But this is the Shinobi world! Dropping below the level of the statue, I took the kunai and stuck it into the mountain. Slowly slowing down, he stopped at the foot and jumped down the mountain. Yeah, Itachi used to do similar feints when he was my age. Just to test his will to live, and me by accident, but also EPIC!!!! Well, now let's deal with the key. A brown, even rust coloured, long key, almost as long as my hand. Quite a nice shape.

- And how do you activate it? I got silence. I guess I was told I had to figure it out for myself.

- Activation!

-...

- Activate!

-...

- Command: Activate!

-...

- Open sesame!

-...

- Ahalay Mahalay!!!

-...

10 minutes later

- and threw the key into the wall. And it... ACTIVATED! There was a red arrow pointing north away from me. I walked up to the key and... I wanted to bang my head against the wall! THERE WAS A BUTTON!!! THERE WAS A BUTTON ON THE END OF THAT KEY!!!! And I was screaming like an idiot here trying to guess the word-activator!!!!

- Why aren't little things like that mentioned in the system!!!! Ha-ah, okay! It's no big deal! - I must have thrown the key like a kunai out of habit and it stuck in with the front end where the button was. As soon as I pressed the button again, the arrow disappeared. I pressed it again, it reappeared. Right, the button activates the key. We're done with that. Now the other thing. Activating the key again, I walked in the direction the arrow was pointing. I reached the forest and in the centre of it I came across a large tree. It was two metres thick, and the height... I don't know! It doesn't matter! The important thing is what to do with it. Apparently, this is the entrance to the dungeon. I took out the key and saw the door lock in the tree trunk, thought a bit and put the key... no, not in the door lock, but in my inventory. If I go now, I won't be able to use the main feature of the dungeon, namely stopping time in reality. I should stock up on food and scrolls from the vault and some other things for convenience and training. So, let's go home. Already at home, just about to start everything, I saw my parents at the table. My dad was reading the newspaper and my mum was setting the table.

- Oh! Son, you're here? Sit down at the table, we'll have dinner. - said the father, not removing the newspaper from his face. Is he hiding the bruises on his face?

- First take a bath, you look dirty. Did you work out again tonight?

- No, I fell off Hokage Mountain. But nothing happened." Mum gave me an unhappy look, but then said with a sigh.

- Heh heh, okay. Don't do that again. And go wash up quickly, the food will get cold. - I quickly washed up, changed my clothes and sat down at the table. I think I'll go to the dungeon tomorrow. It's pretty late tonight. And I need to enjoy the evening. I'm not sure how much time I'll spend in the dungeon. Given that it's my first dungeon, I can't stay there for long, but finding keys is a rare event, and I haven't come across any quests yet. I think I'll stay there until I've fully mastered what I'm learning now. And I should start learning Rasengan. I think my dad made a scroll of it too and put it in the vault.....

- Bon appetit!

***

I loaded up the food for the year, I've been putting it there every chance I get for the last two years, just in case. Even Mum's soup is still warm. Then I went through the vault and got all the scrolls I needed. I put some of the furniture from my room in there. I took all the shurikens, kunai and blaster tags I had. Filled up on my mum's chakro paper to make blast tags. Took a few sets of change of clothes. Went out and bought water and non-water balloons, just like in the anime. Got a few hundred litres of water in containers too, stocked up like food. That's it! I hope I haven't forgotten anything. Well, let's say goodbye to Mum and get going!

***

When I got to the Dungeon entrance in the evening, I saw Maito Gai there. Damn it! Only an hour left before the key expires! I've been preparing all day and I'm only here now, and he's training! And it's not like he's jogging or anything. He's doing push-ups! How is that possible?! Today! Right here! He's gonna be here for over an hour just doing push-ups. He doesn't do push-ups like people do. He's been doing a thousand push-ups a day. No, he did them during the academy, but now he's a chunin and he does them a lot more! Fuck!!! That's disgusting! Ha-ah, okay, let's calm down. We have to distract him somehow. Maybe some meat? No! He may be an animal, but he's not that feral! Then what? Hmm, the only way I can think of is...

- Maito-san?

- 1056, 1057, 1058, 1059...

- Um, Maito-san.

- 1060! 1061, 1062, 1063...

-MAITO GAI, DAMN YOU!!!!

- А?! What? A boy? Sorry, I couldn't hear you. What do you want? Are you lost?

- No, Maito-san, Kakashi-san asked me to call you. He said he's having an endurance contest and you need to come right away! - and he ran off without a second thought! Okay, I have to get into the dungeon before someone else shows up. And when I put the key in the door lock on the tree....

- Wait, boy! Where is he? Where's Kakashi?" I opened the door in a panic and stepped through it, ignoring the transparent energy film.

I felt like I was walking through water and accidentally fell in. When I looked up, I saw a face. A dog's face! And from the menacing look on her face, I knew she wasn't a good dog. Not a good dog at all! She came at me in a second, and I dodged it and climbed up a tree. It was a tall tree, so I wasn't worried about my safety. Now, let's have a closer look at the dog. Hmm, the very first thing I noticed was the inscription on this dog's head. Junior Wolf of Fenrir, grade 1. Danger: Low What surprised me was that it was a Wolf, not a dog! No difference, though. Well, the wolf itself was quite large. I think he's taller than me even just standing on his paws! The colour of his fur is red, as are his eyes. He looks very fierce. The lower fangs are very pronounced. They're like metal. And while I was thinking about it, a red bell flashed in the corner of my vision. It's an alert from the System. Before, alerts just appeared in front of my eyes, and I thought that if it suddenly appeared in battle, I'm fucked! So was able to find such a function in the settings. So when I clicked on this bell, I saw the notification window in front of me, which made me want to jump for joy!!!!

Congratulations!

Obtained passive skill: Observation Level 1.

Observation: You thought you wouldn't have it? How without it, the ability, thanks to which, you can understand whether to run away or not! The skill reveals a certain amount of information about the target. The higher the level, the more it shows.

Attention! If the target of the skill is much stronger than you, the skill will not work.

Finally! I have a skill! I was beginning to worry I had a faulty system. Now, let's find out how it works. And I looked at the wolf.

Name: Junior Wolf of Fenrir.

Level: 1

Race: Demonic Wolf

Danger: Low

Characteristics:

Strength: 89

Speed: 120

Dexterity: 107

Intelligence: 10

Spirit: 50

Stamina: 96

Features: Demon

Hmm, characteristics and features appeared, and I already knew the rest. In terms of characteristics, he is inferior to me, though not by much. But we're the same level. Hmm, but I was born level one, and the characteristics were increasing. I guess it doesn't depend on the level that much. I wonder what I'll get for leveling up, though. I haven't tried killing animals in my world yet, but I think I could level up from them too. Now, let's see if I get a level for killing a mob of my level. I grabbed my kunai and jumped at the Wolf. He couldn't kill it right away. He first grabbed the kunai with his fangs and wanted to attack me with a claw, but I managed to jump back, then he threw the kunai out of his mouth and headed towards me. Taking two kunai, I jumped towards him and stabbed him in the eyes with a sharp movement. He roared and ran past me. From there, I just dodged and pelted him with iron. After five shurikens, the Wolf fell down and writhing in pain, then stopped moving.

You killed the Younger Wolf Fenrir.

Soul Crystal 1 obtained.

Hmm, looks like I won't get a level for killing one of my own level. Then let's kill a few more and see how many I need to kill. I can already feel two more Wolves watching me. But what's the Soul Crystal? I seem to get it automatically, but I don't see any crystal. I discovered it in my inventory. When I pulled it out, the dogs... ahem..... the wolves that had been watching me went berserk. I think they were attracted to this thing. Looks like a small, light, violet-coloured Crystal. Okay, we'll figure it out later. Right now, we need to kill these wolves. Let's take turns killing them, so we don't mix up the exact right number of mobs of my level to kill. I wanted to test my naked strength, so in a leap I just kicked one wolf from the side. It flew at its kin, who was running right next to it, and knocked it down as well. That's cool! It's not like I trained for nothing! Even though the wolf didn't die, it flew about three metres away! When they ran at me again, it was clear that the kicked wolf had taken damage. It was now clearly running slower than the other one. When it appeared, I clamped the kunai in its teeth with one hand and stabbed it in the throat with the other. Next, I ran to the other wolf myself and jumped in mid-air, somersaulting the wolf into the ground with my foot. He died quickly, too. And I got their soul crystals.

Level up!

I only leveled up after the last wolf died. So you can consider that's how many you need per level. After getting a level, I got the characterisation points. There were 10 of them and I added all of them to perception. The rest of the characteristics more or less can be pumped, but the perception grows slowly. Whether it's the smell of blood or something else, I could already feel 12 wolves around me. I think it was the smell that brought them here. Now I more or less know the difficulty of these mobs. So let's try something.

- Shadow Cloning Technique!

And ten clones appeared next to me. In a few minutes all the wolves were killed and I got 2 levels and therefore 20 characterisation points. Luckily, even if the mobs are killed by my clones, I still get experience from them. I now have 13 soul crystals. Well, it seems after leveling up, I need a lot more experience points to level up again. That was expected. The number of experience points needed grows exponentially. When I reach a high level, it will be harder to level up. Then it's probably not worth it to use experience points on characteristics that I can pump without them. So 10 to intelligence and 10 to spirit. Hmm, the sudden increase in intelligence makes me feel really smart. Same with perception. But spirit. We'll find out when we feel the lust for killing Kushina again. Now let's look at the entrance to the dungeon. When I opened it, I saw Maito Gai in the distance. He wasn't moving. The world has really stopped after all. Then I should kill all the mobs here and catch the boss. Closing the door, I turned back around. And then...

- Mass Shadow Cloning Technique!

Fifty clones appeared all around. Yes, there are more of them. Still, the reserve also increases as you level up. Then all the clones, and me too, scattered into the forest. And after a couple of minutes, I started receiving Soul Crystals. There were a few higher level Wolves in the forest and some of my clones started to disappear. There were some level 10 wolves there as well. Bigger in size and with higher stats. First I started making traps for them. Nothing fancy, just digging holes and putting Soul Crystal in them. These wolves were crazy about them. So when a wolf fell into a trap, I just attacked it with iron. After collecting the kunai and shuriken back up, and so on a few times.

My level grew very quickly and I was getting stronger. The number of clones increased, and my perception with intelligence and spirit also increased. Next, I started making more complex traps. They caught wolves even stronger than me. The weaker ones I killed myself, and with the help of clones only the stronger ones. One time I went out to fight a wolf that was two and a half times my level, of course, leaving my clones with me. But I wanted to do the fight myself, so they stayed out of it until it was necessary. The fight lasted about ten minutes, but I still won. But that wasn't surprising. Although his level was high, but his stats were only one and a half times mine. It was the same with the other high level ones, but it was easier to make traps for them or kill them with a group of clones than going one on one. Still, these ones were just big and strong. You could take them down in a group, but that wouldn't really work with the shinobi from the original world. You have to go one-on-one with them, or use clones as support, because clones alone are no match for them. So I still managed to kill all the mobs, except for the Boss. It took about ten days to do all this.

The boss was at the biggest tree in the forest and wouldn't leave, he was level thirty. I, on the other hand, was now level 16. The first levels, up to about level 10, I was easily defeated because I was initially stronger than them. After that, it got harder. The Fenrir (boss) was about four metres tall. His characteristics were about three times more than mine. But since he still wouldn't move away from the tree, I just decided to leave the clone guarding him here and went to the opposite side of the tree. There I set up a proper camp and started training.