EDIT

You and tanjiro had made it back to the dorms after you gave everyone there gifts

it was already late

and tomorrow wasn't a school day so you all would try to think of ways to get back home

You all where demon slayers and you had a job and that is to kill demons and protect people

11:58 pm

You and tanjiro where at the rooftop of the dorms after sneaking out

"I heard from the teachers there were a couple of student who can make machines do you think they can make something to go to our timelime or our world?"

You asked tanjiro

"Hmm I'm not sure but we should ask them" he said

"Tanjiro we need to get out of this place as soon as possible we have very important jobs we can't just leave behind, you have Nezuko who you need to turn back into human we should be working hard on figuring out a way to get back home" you said in a soft voice

"Tomorrow we can head back into the city to hang out again if you want we can relax and think of ways to get back home" you finished saying

"Don't lie tanjiro you want to go back home you have Nezuko waiting for you, I may have no one there waiting for me but I have a job I must do I won't ever forgive myself for letting him die tanjiro"

Flashback

Y/n and her brother Karma were running fast threw the woods as it was raining hard

"Karma come on you have to keep running! You are a pillar you can't die so easily!" You shouted as you your hair was all over the place

Karma fell over and you caught him your eyes widened as you saw a huge gash on his side

"I'm sorry y/n I love you please be happy, demon blood has already gone into my cut I'm sorry promise me you'll be the new (breath name) pillar!"

He shouted as he was transforming into a demon which caused you to jump up

"I promise you I'll avenge you brother! "

You not knowing tanjiro was there after he heard yelling you slashed off your brothers head shouted

After you grab his haori and cried on the wet floor

The reason you all called him karma was because anytime someone could hurt him they would get karma in a instant

You had passed out on the floor with all your damage from the demon

"I can't breathe someone help.."

Was the last this you had said

tanjiro Had thought you were close to dying so he carried you on his back running back to the butterfly estate

"Shinobu help!"

Flashback over

"Tanjiro I will never forgive myself for killing him nor do I even deserve to be a pillar but yet hear I am" you told him with an empty laugh as tears rolled down your face

"Well I'm going inside see you tomorrow morning for us to go out into town k?"

You gave him a kiss on the cheek and a hug

"Thank you for being here for me.."

and with that you left to bed as he stayed on the roof for a while the kiss to the cheek replaying in his head