Youth

[Rei's POV]

"How many more rounds are left Gai sensei?" I croaked out while almost fainting due to the exertion of speaking itself.

"Ha-Ha my youthful student, don't be looking so glum now we still have 10 more rounds to cover, after which we have to cover 5 more rounds sprinting with our hands." exclaimed the devil youthfully.

Yup, that's me.

You must be wondering how I got myself into this situation.

Well, in order to make sense of this situation we first must look back into the past around 2 months ago.

2 months ago is exactly the time when I cracked Total Concentration Breathing. 

The consequences of using such a technique however caused my body to become agitated and increased my KI's output. 

This led to me outgrowing my father's training as he was a Genjutsu specialist and was training me in taijutsu forms that were compatible with the physique of the Kurama clan.

The problem however is the fact that while innate deficiency of the Kurama clan's history of weaker bodies is now not a problem for me. It also makes me incompatible with the clan's taijutsu training as it has been specialized for a weaker body.

However, after the first month of training with the technique, my body grew much more than expected which rendered my compatibility with the clan taijutsu obsolete.

So I did what any sane Naruto reader would do when they are in need of taijutsu guidance.

I Jumped the Green Beast of Konoha.

No, literally I shunshinned into him by mistake. 

Now how the hell was I even able to shunshin into someone by mistake while actively having a thought stream present on my surroundings at all times?

Well, the reason for that to happen is when an unidentified object is moving so fast that my senses literally can't keep up so I don't even realize the fact that there may be an obstruction present at my landing spot.

After the initial impact which caused my soul to almost yet again leave its body. After 15 minutes of Mystical Plam jutsu usage, it was smooth sailing to convince Gai Sensei to train me in taijutsu by utilizing his guilt of crashing into me (Honestly I am pretty sure he was not expecting a literal toddler to be able to shunshin at such speeds which caused the crash) as my trump card.

I am pretty sure I did not need that as the way his smile lit up his face could have probably outshined the sun itself.

Now the results of my nativity into selling my soul to this training devil caused me to reach total breathing constant in a literal month. 

How? Well when this madman realized that I was able to use medical jutsu to speed up my recovery phase and when he realized my "unusual vitality" he devised a physique-strengthening program. 

Said program consisted of a full body resistance and inbuilt gravity seal along with the body flicker jutsu.

Now I must say Gai is an absolute devilish genius when it comes to cooking up tailored training plans. Why devilish, because he completely forgets about ethics and the limits of the psyche of the human mind. 

No, I am not exaggerating, I literally had to put my thought streams on rotation as they were quite literally on the verge of dissipating when put through the wringer. 

What exactly was this little plan of his?

I basically had to shunshin on precise points while the resistance seal kept alternating its resistance erratically while having the gravity seal that optimally places weight throughout my body on the maximum amount it can handle. 

Now this might not seem like a lot but the thing is that shunshinning also places pressure on your body. It feels like you are vacuuming yourself to the point where you are flickering too. 

This along with alternating resistance and an immense load on your body all while having to use Total concentration breathing is quite literally a form of torture.

Honestly, this training was so brutal that I ended up asking if this regime could end up stunting my muscles and Gai was baffled asking where I even thought about such an Idea.

So it turns out possessing chakra makes it so that as long as you heal properly it does not matter how harsh the training is at a young age. Well of course it should not be at the level of bleeding and breaking bones amount of harshness but weight training at my age would have no negative impacts on my body due to chakra.

Now why did I go along with this form of torture? No, I am not a masochist, the training with Gai makes your gains gain gains.

I kid you not dude is like the Ultimate personal trainer. if you have the willpower and average body potential, this man can limit break your potential and forge your body into a devastating weapon.

Anyway, after reaching Total Concentration Constant my body had an insane transformation.

Not just using Total concentration breathing makes me feel like I am on the greatest sugar rush of my life. The world image quality quite literally scales up and my perception of time scales down. I feel like I was in the matrix going through Neo's perception of Bullet time.

However, it is basically how one would feel with chakra reinforcement or the average perception of a chuinin ninja. 

When put that way it feels pretty underwhelming doesn't it?

Now the thing is that this little "buff" not only improves Ki reserves over time which increases chakra, but it can also be stacked with chakra reinforcement.

The first time I tried reinforcing myself with chakra while using total concentration breathing I almost blew up due to the fact that my ki and chakra were in flux.

Nothing more thought streams can't handle.

Now when I succeeded in my dual buff mode I realized I just hit Jonin-level physical strength... for a grand total of a minute afterwhich I passed out, Deja Vu right there am I right? 

Now Total Concentration Breathing - Constant made that the new normal. After achieving Constant a month in Gai training plan, after Constant following the training plan in a span of a week, my base stats climbed to Jonin. 

What The FUCK

They really were not kidding when they said the difference between normal demon slayers and Hashiras was immense.

I need to remind you all that I was still 5 and a little more than half years old. 

I am not even at my body's maturation age and its strength has reached jonin level. 

This is not peak shinobi human strength anymore. This enhancement makes the superhuman soldier look like a joke. 

I am pretty sure Constant breathing quite literally broke my genetic limit and made me a monster in human form. However, I must say I am pretty sure I reached the limit of my growth for my current age.

Sure while Constant broke my genetic limit, it still has its limitations as I am pretty sure I have reached maximum ki generation output. Well constant output. I am pretty sure when I create a breathing style I will be able to overdraft more but for now I have reached my limit.

Now If I require more physical strength I just need to look into more efficient chakra reinforcement. 

Now Gai noticed my absurd leap in strength and was quite shell-shocked. Now if it was any other person they might try to extract the cause of such a leap in strength. What Gai did on the other hand was first check up my body in case I damaged myself somehow. After that, he proceeded to adjust the training plan in order to focus on stamina training. 

No questions whatsoever. 

Well works for me. 

Anyway currently for the past month post-constant I have followed Gai's endurance routine.

After completing the final handstand circuit Gai took me to training ground 11.

"Alright Rei, my initial plan was to strengthen your physique for the first 6 months of our workout together. But seeing as you have completely blown away my expectations with your burning youth I have decided that we should get started on teaching you my signature taijutsu style- Stong fist" 

And just like that another ring of hell was revealed.

I should have become a genjutsu specialist like Dad told me to.

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Water Stream Rock Smashing Fist as main fist taijutsu tech

-Yes

-No

-Other

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