Let me explain; I decided to do a role/personality swap with most of the main cast of Demon Slayer. There will be common things (Demon Tanjiro and Slayer Nezuko) and not so common (Coward Kanao and emotionless Zenitsu). Now, why I am doing this? Simple, too much coffee and Monster energy drink. With that said, enjoy.

Chapter 1: The Kamado Siblings

"Nezuko, are you sure you can go? I think I can manage." Nezuko smiled at her older brother as she stumbled with the coal.

"I am sure Brother. Your arm is still broken after all. Also, take this as a small vacation." She said and Tanjiro smiled.

"Just, take care. Good luck!"

Nezuko waved at her family as she descended the mountain.

XxXxXxXxX

Nezuko run down the mountain towards the village, Tanjiro limping on her back as she prayed to any deity hearing.

"Just hang on a bit more Brother! You'll be fine!" She screamead as Tanjiro finger twitched giving her hope "Brother! Can you- AH!"

She stumbled and Tanjiro fell some feet away from her, and he slowly started to twitch "Ne...zuko..."

Nezuko crawled to him "Brother, don't worry! We'll find the doctor and he will heal you!"

Tanjiro lifted his head, his eyes with slits "I'm... hungry..." He then jumped at her, clawed hands aiming at her.

Nezuko managed to dodge as Tanjiro fell face first into the snow and looked at her with tears in his eyes. "Nezuko... leave... run..."

Nezuko covered her mouth as tears started to form on her eyes "Brother... I can't leave you..."

"I... can't control myself... I am so hungry..."

Nezuko crawled slowly to him and saw a shine coming from behind her brother.

She quickly grabbed him by his haori and pulled him away before the blade could cut Tanjiro's head, her hair being cut by the slash.

"Impressive! But why did you do that young lady!"

Nezuko looked at the man with a flame pattern haori, blonde hair with red marks and wielding a sword.

"B-Because he is my brother!" She said as Tanjiro grabbed his head in pain.

The man nodded "I see! I can already see the flame in your heart! The flame to protect those close to you! But sadly, that thing is not your brother anymore!"

In a blink, he grabbed Tanjiro and held his sword to his neck "And it is my duty to kill demons!"

Nezuko looked in horror as Tanjiro trashed in his hold, looking more and more feral than before. "W-Wait! Isn't there a cure! Anything!"

The man closed his eyes, still smiling "I admire the love you have for him, but no. Once turned into a demon, the best thing is to slay him to preserve his memory."

"But-"

"But nothing! If you wish, I will help you prepare the burial and-"

He tilted his head as Nezuko threw a rock at him. "L-Leave us alone!" She kept throwing rocks and he kept tilting his head. "He hasn't done anything wrong! You are not giving him a chance to defend himself!"

Tanjiro looked at Nezuko and stopped trashing around "Nezuko..."

The man looked perplexed at the demon, before he was headbutted and lost the grip on him. Tanjiro rushed to Nezuko and the man cursed.

"No!"

And was surprised to see that Tanjiro hugged Nezuko tightly. "Everything will be fine... I just know it..."

"Brother..." She hugged him as she started to cry.

"Amazing! A demon that can control his urges! And talk!" The man said "Do you have names I can call you!?"

Tanjiro gulped and nodded "My name is Tanjiro and she is my little sister Nezuko. And you are?"

The man nodded and sheated his sword "My name is Kyojuro Rengoku, Flame Pillar of the Demon Slayer corps!" He looked at Nezuko "And Nezuko, may I ask you something?"

Nezuko nodded "What are you? A small flame or an intense explosion?"

Nezuko looked at him. It was a... weird question. A small flame... that sounds weak while an intense explosion sounds violent.

"I am neither." She said and Rengoku smiled.

"Excellent. Then let's go!" He exclaimed and both siblings looked confused.

"Go where Mr. Rengoku?" Tanjiro asked and Rengoku smiled.

"I decided I will train Nezuko and made her my Tsuguko! And we will find a cure for an innocent demon like you!"

XxXxXxXxX

Nezuko panted as she strikes the dummy again with a wooden sword, the sun hitting her skin, feeling like she couldn't give more.

Senjuro, Rengoku's little brother, cheered her as he and Rengoku watched. He was so excited to teach his Flame Breathing to someone. He even called Mitsuri to come and help him teach her.

He looked up, remembering a request from Tanjiro;

"Rengoku-San... do you know something of the Dance of the Fire God?"

That was a week ago, and every night since that day, Tanjiro had danced outside, not even noticing how he was being watched.

Once Mitsuri arrived, two things happened; first, she declared herself as the new older sister of the Kamado's.

"They are so cute! And the love as siblings they share makes me want to help them more! Are you two hungry? Don't worry! Nee-San will make a big meal for you!"

The second, her interest in helping Tanjiro.

"I'm sorry Tanjiro-kun, but I don't know anything of the Dance of the Fire God. But! Had you heard of Capoeira?"

While Nezuko practiced the Flame Breathing Form, Tanjiro mastered the martial art known as Capoeira, a martial art that mixes fighting with dancing.

Two years passed, and Rengoku allowed Nezuko to take the Final Selection. Mitsuri cried as she watched her 'little sister' ready to become a demon slayer. Tanjiro hugged his sister, his hair longer compared to her own.

"Nezuko, I have a gift for you. Close your eyes." Nezuko complied and after some seconds, she felt a pinch on her right earlobe. "Okay, open them." She opened her eyes and saw that now Tanjiro only had one Hanafuda earring.

Her hand went towards her right ear, and felt it. Her brother earring. "Brother..."

Tanjiro smiled at her "That way, we will always be together, no matter where we stand."

Mitsuri squealed at that act of sibling love and Rengoku smile widened "Now Nezuko my girl! Go and make us proud! We will wait for you!"

Next Chapter: The Coward Looking for Love