For quite some time I wanted to write a crossover story on 'Naruto' and 'Demon Slayer', two of my favourite anime series. "Shinobi Who Slays" is a reflection of my long-time wish.

Note: I don't own 'Naruto' or 'Demon Slayer'. They solely belong to their respective creators. I do, however, own the plot and OCs.

Synopsis: Naruto Uzumaki, the Seventh Hokage, Child Of Prophecy, Hero of the Fourth Great Ninja World War died and thought that he would meet his father, mother and beloved teacher in the pure world. He did find a mother along with a lot of siblings. He also managed to get himself a teacher. However, he was not Naruto Uzumaki anymore. He was Kamado Tanjiro, a thirteen year old boy living with his family on the top of a mountain. At first, he thought life would be good as he had a family again. However he was proved wrong within a few hours.

When the demons threatened his family's existence, the reincarnated shinobi decided to let the world know how much stronger one can get when they have someone precious to protect…

With most of his skills and powers intact, he will protect the innocent no matter what. That is his nindo. His ninja way.

Cover Design: Me of course! But the parts of the cover belong to their respective creators.

Chapter One: I Am Who?!

Naruto found himself in many unbelievable and weird situations. One could make a few categories of these situations. Waking up in front of something unnatural is one of those categories. Sometimes waking up in a sewer, something in the stomach of an ancient beast, sometimes in front of dead people. Sometimes legendary and mythical men wake him up… But none comes close to this.

When he lost his consciousness during his final fight, his last thought was meeting his mother, father and Jiraiya in the Pure World. What he didn't expect was to wake up in a hut.

"Tanjiro." Someone called somebody.

'Who? That's not his name.'

"Tanjiro?" They repeated. "Look at me."

"Who are you talking with?"

"Huh?" They sounded… confused. "You, of course. Whom else's name is Tanjiro?"

'That's not my name!'

"Look at me dear!"

Blink. Blink. Blink.

"Tanjiro?"

"Who? Me? I am Naruto Uzumaki." He replied to the woman before him.. "The seventh Hokage dattebayo!"

"What is a 'H-O-K-A-G-E', dear?" The woman looked at him with concern. She touched his forehead and frowned. "It doesn't seem like you are sick. Are you still sleepy perhaps?"

"Etto, mind telling me who you are, fair lady?" he sheepishly asked. Why does he feel all weird? Shorter?

"I am your mother of course!" She almost shouted.

"Mom!" He stood up. Did he die? Is this heaven? Oh… of course. His final battle…. He didn't have Kurama to heal him this time. It perfectly makes sense. "I am so glad mom, dattebayo! I missed you so much! Where's dad and Pervy Sage? Is Neji here too?"

"Eh?" The woman frowned deeply, then hugged him tightly. "Oh my sweetheart, you are missing your dad, right? Don't be sad, I am sure he is fine, happy and watching over us."

"Yeah, but…" wait a minute. His mother was a redhead, short-tempered decently tall woman. Not some dark-haired short woman with light violet eyes. He pushed her away. "Who are you? I am not dead, am I? Tell me where's Sasuke? Konohamaru? Shikamaru? Where are you guys?!"

"Why are you screaming like that?" The woman shouted back. "What happened to you, my son?"

"I am your son…!" He whispered, not quite believing it. And why does his voice sound weird? Wait… this isn't even his voice?

Is this a genjutsu!?

"Kai!" He clasped his hands and shouted. The woman made an audible 'eep' sound and jumped.

"Kai!" Louder.

The woman could not take it anymore. She grabbed his shoulders firmly and started shaking him furiously. "come back to your senses!"

"Huh?" Naruto was perplexed for a moment before his eyes widened and he started screaming. "LET ME GO! LET ME GO! LET ME GO!"

Tush!

"Tanjiro!" After receiving the devastating slap on his right cheek, he was stunned at the act but calmed down a bit. "Calm. Down."

"Okay, then talk." He finally asked in a neutral tune. "Who are you?"

"Kie Kamado," she was taken aback by the question, but adjusted quickly. "I am your mother."

"How can you be my mother? You barely look above thirty?"

"Well…" She choked her own spit. "Well you were born when I was seventeen."

"So, I guess I am this 'Tanjiro Kamado'?"

"Of course." She nodded sadly.

"What is this place?" He looked around.

"Mount Kumotori." Kie replied. "Our home."

"Never heard of it." He looked at the children for a moment before asking, "So… I am what?"

"Huh?"

"How old do you think I am?"

"Umm… thirteen. Almost fourteen."

"Who are they?" He pointed towards a trio of kids in the corner of the room who were looking at him with wide eyes and stunned expressions. "Your kids?"

"Your siblings."

"The pink eyed junior you over there with the baby too?"

"Of course."

"That's a lot of children for a young woman like you." He deadpanned.

"Umm… thank you?"

"You—" he pointed his finger to the girl with pink eyes wearing a pink kimono. "Bring me a mirror, please."

The perplexed girl looked at him with awe. Then an uncomfortable pause. Mother and daughter shared a glance.

"What?" Naruto asked, annoyed. Mother and daughter shared another glance.

"Etto…" The mother, Kie, finally began sheepishly. "We don't have a mirror."

"Huh?" Naruto rubbed his chin. "Who doesn't have a mirror these days."

"We can't afford one." The seemingly pink obsessed girl finally opened her mouth.

"Seriously? It's that expensive!" Again mother and daughter shared another uncomfortable glance. 'Is this a THING?' Naruto let out a sigh. He crossed his fingers together and poof of smoke appeared beside him. Every occupant of the room squeaked.

"T-two onii-chan!?" The youngest girl in the corner said in a shaky voice.

Naruto stood up and observed the clone. Average height. More adorable than handsome. Weird reddish-black hair. Scarlet-black eyes. Weird mark on the forehead- birthmark or some sort of accident perhaps. Strange earrings. Black chequered green haori. Judging from these people's facial and body structure they don't seem to be from the Elemental Nations. So either they are from some other continent or it is a completely different world— the former is possible and for the latter doesn't seem impossible as Naruto has more than enough experience for him to believe this can be very much real.

"What is happening here?" Kie finally stood up and shouted.

"Hmm. Weird. So… I died." Naruto stated simply.

"What?" The pink eyed girl couldn't hear it.

"Say," Naruto began. "If I were to say that I am a 40 year old village leader and one of the most powerful men in history also I have a wife and children, one of whom is 17 and the other one is 13 would you believe me?"

They gave him a blank look before retorting in unison, "OF COURSE NOT! YOU ARE TANJIRO KAMADO! AND WHAT KIND OF RIDICULOUS STORY IS THAT?"

Naruto let out a deep sigh. It should be pretty much pointless to convince them something so unbelievable like this. He doesn't know how, but he knows he can't return. He is still very sad considering the fact that he may not see Hinata, Boruto and Hima again. He felt a big weight on his heart. They are his family… but now, not anymore. Now he has these people… 'Guess I should settle down here.' He thought. 'A big family would not be so bad after all. Plus they all seemed pretty nice. But I still need this boy's memories. Maybe I should meditate and see if I can find the REAL Tanjiro's memories.'

Naruto sat in a lotus position and closed his eyes. He instantly entered his mindscape. Doing meditation for years has taken him to such a degree of mastery over it that he can instantly enter and exit his mindscape. But something startled him.

Instead of his regular sewer-like mindscape, he found himself standing in a… 'How do you describe this?'

The place was enlightened with soothing light coming from who knows where. There are tiny shiny particles in the air. There was no ceiling, instead a beautiful semi-cloudy sky. 'Shikamaru will kill to come here.' The place is warm, not irritating, but nice.

This is proof of how enlightened the boy's mind is. He must be the one of those called 'pure-hearted'.

"Who are you?" He heard someone ask from not too far.

"I am Naruto Uzumaki." He replied as the person, now revealed a boy came into his view. "Are you Tanjiro Kamado?"

"Yes." The boy nodded.

"We have lots of things to talk about."

English is not my mother tongue, hence, I ain't no expert. So please don't mind. I will try to update weekly. Till next time!