Let's reincarnate the reader into Demon Slayer/Kimetsu No Yaiba, as Tanjiro's 4
Years Older Brother.
P.S. There'll be manga content so if you only watch the anime you should probably not read this.
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Y/n sighed, he was 17 currently. This should be around the time when the Kamado Family dies. Over the years he's gotten a lot better at showing his emotions now. His hair blowed in the wind as he walked to the place he trains. He trains the whole day, his body aching, bruises covering his body. "Phew, that was a good training session." Y/n mumbles, he streatches then shortly after starts to head home. "I wonder what'll happen. Will Nezuko still be turned into a demon, or could it be Tanjiro? Perhaps it could be the both of them? No matter what, I'll protect Tanjiro and Nezuko." Y/n thought to himself, he looks up to the moon. It was a peaceful night.
He sat down near a river, he stares at the moon emotionless. Y/n curled up into a ball, tears running down his face. "I-I don't want my family to die.." He thought, his hair blew in the wind as he weeped. He clenches his hands, blood started to come out of his hands. He looks up at the moon, streams of tears flowed faster than his heartbeat. Tears of pain running down his cheeks. A single drop of grief welled up from the corner of his eye. He bleeds the salt of his soul and as it pours from his eyes. Hot torrents of grief coursed down his face. His chin quivered, his lips trembled as he rapidly blinked to clear his tears. His shoulders shaked from anger, grief, self loathing, he threw back his head and let out a loud, pain filled laugh. Y/n regained his composure trying to force a smile with tears in his eyes.
"Calm down, everything will be okay." Y/n says trying to reassure himself, he wipes away his tears. He stays there for a few more hours before standing up, the sun had raised recently.
The woods secluded him from the rest of the world. He's on his own with nobody else in sight, just nature, and only nature. Y/n's not alone though. The sounds of nature gives him a welcoming feeling. He's part of nature for the duration of the walk home. There are no roads or buildings. There is only a dirt path, leading him through the wild and finally to his destination, home.
His eyes widen in alarm, his body shook rapidly trembling, fumbling, heart pounding, clumsiness, muddled thinking, short breath, vision blurring. He rushes towards the house, while running he tumbles, colliding with the floor. "E-Eveyone, i-is dead!" He stumbles up, he rushes to Nezuko and Tanjiro's body. Luckily Tanjiro doesn't look too bad, he'll make it. He checks Nezuko, finding out she's in critical condition. He picks her and Tanjiro up, he rushes down the mountain not sure who was the one who turned into a demon.
"O-onii-chan..?" Y/n hears Tanjiro's weak voice inquires. "Shhh, Onii-chan's here." Tanjiro closes his eyes, mentally exhausted. "Graaaaaaaaaaaaaagh!" Nezuko yells, rapidly moving around. "N-Nezuko!?" Tanjiro now fully awake looks at her. Y/n stumbles and falls off the path he was running down, he stands up.
"Tanjiro are you okay?" Tanjiro eyes were squeezed shut, he atleast looked like he was mostly okay. Y/n wondered how Tanjiro managed to survive. He sighs, he'll have to find a doctor to help him, he discards that for now focussing on Nezuko. He walks towards her, he vanishes from sight, appearing behind her he chops the back of her neck.
Y/n turns his head, suddenly Giyuu appearing behind him. "Who are you?" He inquired, Y/n stares at him. "Y/n Kamado." He answered, Giyuu looks at Nezuko who was laying on the snow floor. "I'm going to have to kill that thing." He states bluntly, Y/n glares at him with annoyance all across his face. Giyuu sighs, unsheathing his nichirin katana.
He rushes at Nezuko, Y/n rushes in front of him. Slamming his palm into Giyuu's abdomen, he then throws him away. Giyuu keeps a poker face on as he lands on his feet, that palm attack to his abdomen wasn't strong enough to do major damage. However, he was incredibly fast.
Tanjiro rushes over as fast as he can, protecting the knocked out Nezuko. "What do you think you're doing?" Giyuu asks Y/n, who replies back with a middle finger. Nezuko wakes up, flailing her arms around, she pushes Tanjiro away. She rushes towards Giyuu, her weakened form throws punches at him.
"It's determined to protect those two? Maybe.. just maybe, these three are the ones." Giyuu though as he sheathes his blue nichirin katana in the scabbard. He brought his hand down, slamming it into Nezuko's neck. Y/n walks to Tanjiro, Tanjiro looks at him confused. Y/n embraces him, Tanjiro starts balling in his arms, the pain and grief finally surfacing.
Y/n rubs his back, his right hand raises. He then karate chops the nape of his neck. He passes out in Tanjiro's arms, he walks towards Nezuko's knocked out form and lays Tanjiro next to her. He turns around and sees Giyuu standing there akwardly, Y/n stares at him. "So.. uhm, you come around here often?" Y/n asks Giyuu, who in return blinks in confusion. "I'm going to ignore what you just said. Anyways, head to Sagiri Mountain. There look for a man named Sakonji Urokodaki." Giyuu tells Y/n, he then promptly proceeds to vanish. Y/n turns around and looks at his sibling, he blinks suprised. How the fuck did the bamboo get in her mouth? Y/n sighs, Giyuu probably did it while he was embracing Tanjiro.
He picks the both of them up and walks back to the house he grew up in. Arriving at said place, he places Tanjiro and Nezuko down. The next thirty minutes he spent burying the corpses of his family. He walks towards Tanjiro and Nezuko, he picks the both of them up again. He grabs a basket with a cover from the house and puts Nezuko in it. He puts the basket on his back and carried Tanjiro in his arms, he starts to walk away from the house he has so many memories with. His new destination, Sagiri Mountain..
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Now, it's time for a Taisho Secret!
"Onii-chan! Remember when you wanted to see how hard my forehead was!?" Tanjro asks Y/n excitedly, who in return gives one of his rare smiles. "Yeah, when you gave me a concussion."
"Don't forget you also said; "Why is there Unicorns everywhere?" It was too funny" Tanjiro fell to floor laughing.
Y/n looks at the readers with a blank face and mutters; "This is boolyism."
