Hey everyone....the beginning will be about the total concentration breathing then we will get to the nutshell/funny part
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"Y/N" tanjiro yelled

"Hmm what's wrong tanji-kun" I asked

"Do you know about this breathing style called hinokami kogura" he asked

"No" I said bluntly

"I do but something inside of me is telling me not to..."

"Ehh I will never find someone who does I'm guessing" tanjiro said

"Oh tanji-kun just because someone doesn't know what it is doesn't mean that it's the end of the world" I said

"Yeah your right surely there will be someone" tanjiro said

"That's the spirit" I said

"TANJIRO!!! TANJIRO" three girls said

"Oh hey naho, kiyu, and sumi" I said

"Hi y/n" they said

"What's wrong" tanjiro asked

"Oh well we wanted to ask if you learned about total concentration breathing" sumi asked

"Huh no" tanjiro said

"Oh I have" I said

"Oh, is that why you beat kanoa before tanjiro" kiyu asked

"Hm maybe" I said

"Wait...whats total concentration breathing" tanjiro asked

"Oh well total concentration breathing is something every hashira and kanoa can do and when you master it you can blow into this" naho said while holding a gourds

"Huh wha...a gourd" tanjiro said

"These are special gourds....they are harder to break, this is what shinobu-sama made kanoa blow into" sumi said

"Oh well can I try" I asked

"Of course" kiyu said
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3rd pov
"You blew into the gourds and they busted in a couple of seconds"
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Your pov

"Wow y/n you busted them on your first try" kiyu said

"Eh y/n can you also teach me" tanjiro said

"...okay" I said

"Why did you go silent" tanjiro asked

"No reason....why" I said

"Y/n.....I known you for so long y/n and sometimes you still scare me......" tanjiro said

"Oh I see" I said with a scary voice and glare
.
..
...
"Well everyone I will be going inside" I said

"O-okay" tanjiro stuttered

".....b-bye" the girls said in unison
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Inside

"Y/n when was the last time you've slept a complete 8 hour's" aoi asked

"Oh 10 days ago" I said

"That's not good for your health, please get some rest" aoi pleaded

"Okay, can I get some right now" I asked

"Yes" aoi said
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3rd pov

-you fell asleep and a strange thing happened
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Y/n pov

"Hm, wow...what a pretty place" I said

"Hi" someone said behind me

"Hm hello~" I said

"How did you get here" I said

"Oh I'm dead" he said bluntly

"Oh are you from the Sengoku era right" I said

"Yes how did you know" he asked

"My father told me about the Sengoku era, and when he told me about that I was so interested on becoming a demon slayer" I said

"Why didn't you" he asked

"I don't know I guess I just lost interest onto following the rules of the demon slayer corps" I answered

"I see" he said

"Yoriichi, may I know yours" he asked

"How could you not know my name" I asked
.
..
...
....
"Because I forgot it...." yoriichi said

"Oh well my name is y/n, are you perhaps the sibling of koku-san" I asked

"Yes how did you know" yoriichi asked

"Because you look almost the same" I answered

"Hm tanjiro looks like me yet were not siblings" yoriichi said

"Yeah and if you were a sibling of tanjiro the kamado family wouldn't be dead" I said

"Hm" I thought

"You look dead inside" I said

"Eh" he said

"Oh it's okay because I am to" I said

"Oh my goodness are you okay" yoriichi asked

"Can't say I am but it's fine" I said

"Hm"

"Yoriichi..."

"Yes"

"Would you like to travel around with me" I asked

"Hm oh are you sure" he asked

"yes I might be able to bring you back alive in the process" I said

"Okay"

-you started to float all of the sudden-

"Huh am I waking up or something?" I said

"Yes see you tomorrow" yoriichi said

"Will demons be able to see you" I asked

"Yes" he said bluntly

"Okay bye chi chi" I said

"Heh bye y/n" I said
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*while you were sleep kokushibo got excited for tomorrow for some reason

*in this au kokushibo regretted what he did to yoriichi after he semi-killed him

*y/n thinks that kokushibo and yoriichi would be so happy to see each other

*when everyone is asleep tanjiro would try and bring up the courage to tell you how he feels about you

*when you are at rehabilitation training nezuko would follow kokushibo around