Reborn in demon slayer as an Uchiha

Nichirin

"Breath in deeply in letting the airflow through your lungs breath in ..., breathe out rinse in repeat, "Rengoku told me

"Neet why did I not know of this before"I spoke to no one in particular
"You never really get tired, you train a lot without running out of breath your breathing is always constant in you always learning new tricks the more day pass," said Rengoku while looking at me

"Heh not my fault I'm physically stronger than you "I looked at him and said
"I wasn't not blaming you in the slightest, to say the least I'm impressed with your ability to have such incredible stamina, "he said while walking away
"Wait where are you going if I may ask "I said
"I'm not gonna stay still in let get any stronger than me I'm the big brother in it's my job to protect you not the other way around," he said while fully getting out of my viewing distance

I just looked at him as he disappears, and then I sat down and meditated for a bit good news as long as I don't meditate for too long HE won't appear, so after meditating for like 30min I got up in did the exercises over in over again till I could do it on command I wonder if there a way to keep it on at all time that's to be great for me.

I went to look for my blade sheath, and I found it under my bed. I took it in and started to swing. I stopped by midnight, I felt like I could go on forever. If I ever run out of stamina in a fight it is either I fight someone so much stronger than me that I take too much damage in get wore out pretty easily or two some messed up bs but hey the chances of that happening are pretty low plus I have chakra so hey that a plus for me.

Time-skip to a week
After a week of waiting someone came to the house, he was here to give me and Rengoku our sword, dad wasn't there he left 2days earlier in some mission.
A masked men knock on the door.
I open it "oh it you come in do you want some tea while you stay"I said to him
"No I'm just here to give Atoru in kyojuro (A/N Rengoku is his family name )
"That's me in kyojuro is already inside so come in"
He remove his sandal in enter the house he sit down in he said

"WHO getting there blade first"he said
"I'm go first if that ok with you " i said
"No problem with me you can go"he said
I raised my hand to grab the sword by the hilt and raised it, it started to change color from silver color to a dark red sword with a dragon-like hilt(A/n I'm not good at describing stuff as any human could tell)

"Nice a dark red blade like the last one that I was using it pretty neat it look amazing kyojuro it now your turn "i said
"You got a nice sword now it my turn"Kyojuro said as he slowly took the second sword red flame pattern appears along its blade as the blade turn red

"My job here is done is was a pleasure to meet your all "the man said before he left
'I thought they were all crazy huh I must have not watched any clips of it online'
After me in Rengoku went out see Senjuro training outside but failing miserably to-swing a sword but when he saw us he said"I'm so embarrassed you two are strong enough to become demon slayer but I can't even swing a sword properly "he said looking down
"Don't be embarrassed be proud of yourself because you worked so hard "said Rengoku with a smile on his face
"Thanks, you, " Senjuro said smiling and in tears
"Your the man of the house while we are gone do your best okay"Rengoku said
"Ok no one will get in without my permission, "he said smiling
"It time for my first mission see you in Atoru later"he said while walking off
"I'm gonna work really hard to be just like you"
Senjuro said
Rengoku shock stop for a bit smile in left
'did he get some flash back or something is that why he stop'I thought to myself
"Now let me help you with that cramped hand I'm healed for you" i said as my hand glow a very smile green
"See your bruise are gone"i said smiling
"Thank you with this I can continue to train my hardest " said Senjuro
A crow flew by in yelled out "Atoru must go to the Miwauchi village ."
"Guess destiny call me see you later little brother"i said
"Bye Atoru"he said
I smiled and left