Reborn in demon slayer as an Uchiha

Cold

Last time in i was reborn in demon slayer as an Uchiha

"You sure about that"Kanae said not fully believing me.

"No, I just have something on my mind" I explained

"What is it unless you don't want to talk about it then it's fine, "Shinobu said softly

"It is a long story"I reply

"We are great listeners," Kanae said softly

I trusted them, I usually try to carry all the burden by myself but because I didn't want to hurt them again, I decided to just tell everything that I found in that cave, and all the implication that come with it.

They listen to me talk for half an hour about everything, and on what were my thought during all of it, I didn't leave any detail out because I will feel horrible if they died because I was too stubborn to tell them a piece of information that would have saved their life and instead tried to play a hero.

Now we continue where we left off

I woke up the next day feeling refreshed and energized from yesterday, I was in a better mood than I was yesterday, and I now realized that just thinking about it will not fix my problem so instead, I'm going to train myself to the limit.

I will also have to use a lot of shadow clones which means a lot of mental drain for me, but as long as I am not releasing like 100 shadow clones a second, I should be fine.

'I might need to create a lot of sealing jutsu from the note my ancestor left behind and if I add my own notes into it, then I can make a lot of useful and deadly seals, all I need is to use my imagination and the little knowledge I have left from Earth' I thought while scratching my head

"Why can't I catch a break every time I think I'm ready, something bad happens that makes me realize I'm far from ready, it's as if the world itself doesn't want me to rest before I kill this monster" I mutter out while groaning

'Now that I think about it, every time I'm weakened in some way, may it be mentally or physically, I either get jumped by the strongest demons or the demon king himself is rushing at me from the bottom of a mountain, the fuck kind of luck is that,' I thought while getting out of bed

After getting out of bed, I walked around only wearing my underwear before getting out of the room, I walked toward the kitchen before making breakfast.

I made something with enough calories to start up the day, I made some for myself and some for Kanae and Shinobu even if they were asleep right now, and because I made some seals that help keep the food warm for a while before it cooled down, the food would still be hot by the time they woke up.

I put the food on a plate before walking with it toward my room, I reached it pretty quickly considering the distance between the kitchen and the sleeping area is not that much, I slide the door open with one of my hands while balancing the plates on my other hand.

I enter the room before walking toward the feet of the bed and putting the food on a small table near the bed.

When I was done with that I walked back outside and slide the door closed behind me.

I walked toward the bathroom before stopping myself from going any further."I'm going to exercise which means. I'm going to sweat a lot, so why not take a shower after I'm done"I mutter to myself before I walk outside

"Time to refine everything, i already know, and one of the basics is breathing efficiently, the other is swordsmanship, so I have an idea on how to improve both, "I said

Considering I already live on a mountain I could climb to the peak of the mountain because the higher up I go, the harder it gets to breathe normally.

"So that's why they built it on a mountain,"I said finally realizing why my ancestor loved to build their stuff on mountains

"I will have less oxygen, but that just means that mistakes are costly and that will force my body to adapt, I should also try something new considering most of this is for me to boost my lunges capacity to a new level, I should also get some of the jars that Kanae gave me to practice total concentration breathing the first time we met, "I said thinking over my plan

"Then let's do this, "I said walking toward the top of the mountain, I walk and walked but from what i saw i was not getting any closer to the top, the air density was also decreasing causing me to take the shorter but more efficient way to breathe.

Eventually, I reached the top of the mountain, it was freezing cold, and considering that I was wearing nothing except my boxer, The first that came to mind was to heat myself up with fire chakra, it would have been simple and easy but I'm not here to train my control over my chakra, I'm here to get better at breathing, Yes I said it, I'm here to get better at breathing.

"If I remember correctly back where I'm from, there is a breathing technique to help you from the cold, if I remember correctly someone climbs mount Everest with only shorts and some socks, so i think I can do it, "I said before noticing a lake that weirdly hadn't frozen over{A/N I did the research and yes someone actually did it, and also yes there is breathing that help you against the cold and the man name is Wim Hof,}

"This lake is giving me ideas on how to improve while I'm up here, but for now let's get exhausted, "I said as I immediately started to do physical exercises in the freezing cold, my only goal for today was to maintain my breathing in the freezing cold, keep myself warm and to push my body to always breath properly even if I'm half dead.

A/N I toyed around with the idea of writing their reaction to what he said but that will be giving away too much info