Tanjiro Kamado x Fem!reader

Part 1

Hey. I'm (y/n)! I am a 15 year old girl that lives in japan in a small town. I've been doing Karate since I was 4 years old, but I never really understood why. You see, along my family line each generation has became a demon slayer. I bet you've already guessed that it's my turn now, huh? Welp, you're definitely right, I have to give you that. But the thing is..

I.
Am.
Terrified.

And when I say terrified, like, my heart is literally beating out of my chest of the thought of even touching a demon. Scary, right? I would refuse to become one, which I did like a million times. My brother has been begging for years, but I just won't budge. I tell him Asuno can become one and not me, right? That's not how it works, though. She's only 6. I'm 15. That's a huge age gap if you ask him.

My parents?
They moved to America to get some business done. They're mad strong, so they moved there. Why, you ask? Well, the demon race has gone up drastically over there. They're currently training I've heard. I hope they're safe, I haven't seen them for years. I miss them a lot.

My sister is actually adopted. About 4 years ago, we found her laying near a forest wounded and unconscious. We guessed a demon did the job, I mean, it would be pretty rare if it wasn't. We took her in safely, hoping she wasn't dead. Thank god she wasn't.

And my brother?
He's probably gotta be the most protective person I've ever met. It's kinda annoying, honestly.
Anyways—

Hiroto called to me from the other room.
"Hey (y/n)! I'm going to get some work done, master needs me again today, okay?"

"Okay! Stay safe!"

Who is "master" you may ask?
He's the person who has been training my brother. He wants to become a demon slayer, but he can't because he's too weak at the moment. He wants me to join because of my karate skills, I might actually be able to join the corps with the strength I have now. Except for the fact that I'm terrified, duh.

"Asuno! Can you set up Karate for me real quick? I'm about to do it."

She rolled her eyes. "Fineeee, but only if I can do it with you, pleaseeeeee?—"

You sighed. "Fine, but just this once. You might hurt yourself, and I don't want that." She cheered. "Yes! Thank you, (n/n)!"

You did Karate and taught your little sister everything you knew. It took a couple of hours, but it paid off. You and Asuno were panting like crazy, until you realized something. Your heart skipped a beat.

"Hey Asuno."

"Yeah?"

"..shouldn't Hiroto be home by now?"

"Yeah, I've noticed that too.."

You did know that sometimes your brother was late, but this time was different. Even if he was just a little bit late, he still would've been home by now. At the moment, it is 7:40 pm. He left at 12:00 pm, and should've came back home at 4:00 pm. That's what made you and Asuno worry like hell.

"Hey (n/n), do you think we should check on him?... I'm getting very worried." She looked at the ground, and her eyes started to water.

"Yeah, we should. Stay behind me though, you don't know the dangers that could be out there. Especially with all the demons lurking around, y'know."

"O-okay!"

"Let's change out of our karate clothing, first. Haha."

(This was the kimono you wore, it doesn't have to be if you don't want it to though-)
(Also the art isn't mine)

"Alright, lets go!"

——-

It was about a 20 minute walk, you couldn't get there any faster though because your brother took your bike. Your (h/l) hair flowed as you walked past the cherry blossom trees, very beautiful I must say.

As you were about to reach your destination, you saw a trail of... blood?

TCh, nah, maybe someone had some raspberry juice or something. ...I hope.

As you got closer, your heart started to thump even more. Surely, nothing bad could've happened, right? After all, your brother is very defensive. He's able to protect himself.

You got lost in these good thoughts until Asuno gasped in fear. She covered her mouth in shock, and started to cry.

"W-what? Asuno why are crying so much? You look like you've seen a ghost."

She slowly trembled her hand up, and pointed in front of her.
"Hiro-hiro..to.."
She said his name in sniffles. It was hard to tell what she was saying.

You finally looked in front of you to see a complete nightmare that changed your life forever.

You gasped and fell to the floor. You couldn't believe your eyes. "Wh-why..?"

Your brother was slaughtered.
He was obviously dead. He wasn't moving. He wasn't breathing. Nothing.

You ran up to his corpse and cried. You cried so much. This was the role model you had your entire life. You could hardly breathe.

"Asuno we have to go now."

"W-wha-"
You cut her off

"RIGHT NOW OR WE'LL BE NEXT!!"

You quickly picked her up and carried her on your back, and ran as fast as you possibly were capable of. It was so hard to breathe, because you were crying so much. Asuno tucked her head in your back and sobbed.

You didn't know where you were going. As long as you were safe. You did recall that your house was in a very protected place, so you tried to find it. Finally, you made it! You were panting like crazy, and so was Asuno. You guys comforted each other all noon, until night hit.

At this moment. This hour. This day. This month. This second. You decided to make the decision that..

"I'm going to become a demon slayer."