Reborn in Naruto world with demon slayer powers

Yoriichi prepared everything for the first day, he wore clothes the same as in the demon slayer, a red haori with black hakama pants over an orange kimono, hanafuda earrings and Japanese sandals with wooden and an iron sword on the waist, his hair tied on the back.

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Entering the class I saw a few of my classmates there were only 3 civilians this year who got in without anything special, my tsugikuni clan has a special jutsu and it is the sun fire and the special trait 'sun mark' It is the hottest flame but it takes a lot of chakra of the user so even the smallest flames have to be used with caution. I sat down on the bench and waited for the teacher to enter the class.

I prepared for no reason, even if I had everything for the academy, I needed nothing as all I got taught in the academy was basic language and numbers. After the first class, I started sleeping and no one could stop me! Some civilian students were taken to the training ground for chakra activation, the first day was all about book study, I thought of being smart and going to the library to learn some jutsu or anything that might be useful.

I was only allowed to see the F and E rank jutsu, "damn" it was all scrolls and I could barely see the end of the bookshelf it was quite dark and gloomy for a library, I looked through the scrolls and found some sealing and genjutsu and basic body training, chakra training, chakra nature change and other basic methods, I read through them and thought of trying it in the training ground.

I tried to first form ripples in water as water is the easy thing to start with in chakra control. Fire burns, air can cut, lightning can penetrate, and I don't want to dirty my clothes with soil in the academy, so I started with moving water, I'm not strong enough to move water to damage or even wet the clothes so I started with water.

I tried moving to water but nothing worked for an hour then it suddenly clicked that I may not have the basic chakra control for that, so I thought of walking on water, I was capable of walking on walls and trees before the academy started. I added some chakra on the feet stepped on water and tried to find the right output so my foot doesn't sink. Doing it with hand signs and doing it with free hands is completely different. It requires accurate control but as I was about to step on the water I held back. "Am I becoming dumb or something? Why am I trying water walking?" I scooped out a little water and tried to feel the water with chakra and it happened, I can move water! very little but it was possible to change shape, I tried every type of shape. it was difficult and not every shape worked.

I used a water-breathing style and held my wooden sword! I tried feeling the same thing when I was moving water, my water breathing was limited to 5 hours only because of the help of chakra, and it became difficult to even breathe later. I have not yet tried my sword style or practised taijutsu, I would be using basic of all demon slayer sword styles for kenjutsu but for taijutsu, I have been thinking a lot, in my previous life I had trained in karate for 3 years, but didn't get any improvement except body improvement and flexibility, trained (spared) in a Chinese kungfu (wing-chun) with my gym trainer which was better than karate, I also learned basic boxing with him.

I would incorporate it in Chinese kung fu as it was more lethal than any of the fighting styles which I know. I can also learn and add a few more things if needed. Water is most easiest and the best breathing style which can be used even in taijutsu if implemented correctly, the strongest fighter said 'Be water my friend' If I knew 'Jeet Kune Do' I would never think of any other martial arts. Maybe I can develop 'Jeet Kune Do' with the help of Guy and Rock Lee!? 

I used water breathing and practised water style the whole day and practised the sword. my hand and was injured a little during practice which chakra can solve anyway.

Water breathing style description:

First Form - Water Surface Slash

A powerful concentrated slash

Second Form - Water Wheel

A spinning vertical sword slash in midair. It was improved by Tanjiro by incorporating a horizontal sword slash

Third Form - Flowing Dance

The user moves and bends their body like a dancer while attacking with their sword in one fluid motion

Fourth Form - Striking Tide

A move similar to the first one with multiple consecutive slices. It was improved by Tanjiro by unleashing more strikes with greater accuracy

Fifth Form - Blessed Rain After the Drought

A painless attack meant to decapitate enemies, giving them a graceful death

Sixth Form - Whirlpool

A twirling strike where the user spins their entire body like a whirlpool. It was improved by Tanjiro by combining the movements of Flowing Dance with this technique

Seventh Form - Drop Ripple Thrust

A quick and accurate stab meant to slow down the momentum of anyone or anything. It was improved by Tanjiro by tilting the angle of the stab and completely halting said momentum

Eighth Form - Waterfall Basin

A downward slash that is more effective with the appropriate momentum

Ninth Form - Splashing Water Flow, Turbulent

A footwork technique that allows users to land and launch off surfaces without taking too much time or effort

Tenth Form - Constant Flux

A continuous flowing attack that becomes deadlier by generating more speed and momentum

Eleventh Form - Dead Calm

The user becomes calm as water while countering any attack with incredible speed and finesse

Next chapter - Practicing water breathing.