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Reborn in My Hero Academia as a Demon Slayer.

Our protagonist Kai was a die hard anime fan, however, one day he dies while giving up he's life to save an infant, while lamenting he's death he encounters a self-proclaimed divine being called Wexof who gives him the opportunity to start a new life, watch as he overcomes the world of MHA but wait a minute..... HE DOESN'T HAVE A QUIRK??????? NOTE: I do not own anything from BOKU NO HERO ACADEMIA nor KIMETSU NO YAIBA, all rights go to their respective authors Kōhei Horikoshi and Koyoharu Gotouge. I do not own the image, MHA x Demon Slayer Fan Art by BrArtKy on DeviantArt.

ZackDKaizo · Anime & Comics
Not enough ratings
54 Chs

Overcoming expectations, Senhachiju Pound Ho.

[UA Lunch time]

[Third person POV]

Kaito was eating a pile of food in a table until Midoriya, Iida, Momo and Kaminari took a seat with him.

"Man, how are you so strong despite being quirkless?" Asked Kaminari.

"Dunno how are you so weak despite having one?" Kaito asked back, under normal circumstances Kaito is not rude to people he just met however the exception is when he is eating, not even his mother is saved from this improper behavior and he does it involuntarily so F.

"Toch-erm I mean Kaito-kun doesn't like to be disturbed in any way so don't mind him I can answer if you like" Midoriya tried to console Kaminari who was a little sad for the comment.

"Ok, what is the secret?"

"Kaito-kun told me that since he was 4, he developed a breathing technique that allowed him to surpass normal body limitations"

"Woah" the rest responded.

Yes, despite telling the whole story to the big 3 Kaito reconsidered the best choice and decided to say that he created them so instead he convinced the trio to not revealed the "real" story and to use this one instead.

"Wait does that mean anyone can learn it?" Asked Uraraka.

"Not really, when we were kids, he tried to teach me but I felt as if my lungs exploded and started to cry, since then he swore that he would never teach this technique to anyone."

Of course, Kaito didn't teach him the "Breathing Technique" but the much more complicated "Total Concentration Breathing" the reason was to justify his story, have an alibi and prevent others from asking him to teach them, at least for now.

Kaito finished his food and continued "the breathing techniques vary depending on the way one breathes to the type of weapon one uses, many of my breathing techniques requires a normal katana to perform most of them but others require either larger swords or two swords to perform."

"Also, sorry if I insulted anyone when I was eating but that is a golden rule you must never break" Kaito has a policy to apologize to anyone that is beside him in case he offended them.

"Don't worry man, by the way, what else have you done to become this strong?" Asked Kaminari.

"Nothing new, I just lifted heavy things, did allot of stretches and beat the crap out of some school gangs, ah and of course eat as much as my stomach could carry" Kaito said laughing.

"You are a monster in your own right you know right?" said Momo.

"Really I am more normal than a girl that can create almost non-stop paperclips so…"

"Ok you've got a point" Momo looks the other way a little embarrassed.

(Remember waifu is Tsuyu, don't get any funny ideas.)

While this was happening Kaito saw a green-haired girl with big eyes eating in another group at the distance, it was Tsuyu Asui from the same class. Kaito started to blush a little at how cute she is.

'Nononononono, remember Kaito they are underage mentally, ah who am I kidding even in my past life I had more merchandise of her than any other character in MHA, waaa I sound like a creep what should I do? I don't want to simp her, I've never been in a relationship before worst yet school year just started so I'll be a fuckup if I try anything right now.' Kaito thought in a dilemma.

'Yosh I'll do the only thing I can do in these circumstances: Sleep and think about it later.'

With that Kaito fell like a rock and went to sleep.

"What just happened Midoriya?" asked Iida.

"Sometimes when he eats to fast, he gets sleepy, maybe is that."

After a few minutes class continued as normal, Kaito acing everything Bakugo yelling the answers, Midoriya muttering and of course Mineta getting in trouble for being a pervert.

In the afternoon was the time for hero basic training-

"I AM… coming through the door like a normal person." Said All Might in his Silver age costume.

Everyone was in awe that it was All Might, except for Kaito since he knew that this was destined to happen.

"I teach Hero Basic Training. It is a subject where you train in different ways to learn the basics of being a hero. You'll take the most units of this subject! Let's get right into it! This is what we'll do today—Combat training!" Said All Might excited.

Kaito was wondering with who will he get paired up with since he replaced Koda, but also their sets of abilities are quite different in comparison so he was in the fog.

"And to go with that are these! Costumes made based on your Quirk registrations and requests you sent in before school started." All Might.

Everyone was excited including Kaito, he had been having brainstorms about his hero costume and finally picked one.

"After you change, gather in Ground Beta!"

"YES, SIR!" Yelled most of the class.

[At Ground Beta]

Everyone was using their hero costumes, Bakugo with his aggressive looking costume, Tsuyu's frog like costume, Momo with her very censorable costume and Aoyama with his literal knight on shining armor theme, just to say a few.

After a while one last figure was coming from the corridor. He wore a costume similar to Muramasa Senji but the white clothe was replaced by the top of a colored kimono that in the back had the words "Save" and the shirt he is wearing is a black flexible skin tight shirt that stretched in the back he had the words "Destroy". (He had the Hashira's colors in his kimono).

Kaito wore a face mask covering from his nose to his chin, he had blue goggles in his neck. In his waist were two swords in the left side of his waist and Nezuko in the other, he wears black pants with the pant boot being white, finally the feet were just sandals.

Kaito was proud of his costume and thanked the many voices in his head that gave them these ideas (also known as the readers).

Leaving the 4th wall break apart, everyone as astonished at Kaito's costume.

"Woah why the mask? I think its excessive." Asked Kaminari.

"Prevention against opponents that can poison, it also comes to a mechanism that allows me to get more oxygen each time I breathe" Kato answered.

"Why have those swords on your waist when you have that interdimensional pocket thingy?" asked Uraraka.

"Because it allows me to be ready for combat, being too reliant on Nezuko could be my downfall."

"Nezuko?" asked Tsuyu.

"The sachet is somewhat alive or at the very least sentient so having a name makes her happy so I gave it one."

"Wait, the sachet is a she?" asked Mineta.

"Dunno, but she hasn't complained so I'll just roll with it."

After a little chit chat it started the explanation.

"This is a battle center from the entrance exam, so will we be conducting urban battles again?" asked Iida.

"No, we're going to move ahead two steps! Most of the time, fighting villains takes place outside, but if you look at the total numbers, atrocious villains appear indoors at a higher rate."

"Imprisonment, house arrest, backroom deals—In this society filled with heroes...truly intelligent villains hide in the shadows! For this class, you'll be split into villains and heroes and fight -on- indoor battles." Explained All Might.

"Without basic training?" Asked Mina.

"This is a real battle to understand those basics! However, the key this time is that there's no robot you can just beat up." Answered All Might.

"How will wins and losses be determined?" asked Sero.

"Can we beat them up anyway?" asked Bakugo.

"Will the punishment be expulsion like with Mr. Aizawa?" asked Ochaco.

"I'll answer all your questions! Now listen here." All Might took out a script.

"The situation is that the villains have hidden a nuclear weapon somewhere in their hideout. The heroes are trying to dispose of that. The heroes need to catch the villains or get the nuclear weapon back in the allotted time. The villains need to protect the nuclear weapon for the whole time or catch the heroes." All Might explained.

"The situation feels very American!" Said Hagakure.

"Teams and opponents will be determined by drawing lots!"

"They're being decided so haphazardly?" Asked Momo.

"Pros often have to create makeshift teams with heroes from other agencies, so maybe that's why?" Answered All Might. "Ok now draw lots."

[After the drawing]

[Kaito POV]

I ended in the same team as Tokoyami and our opponents were Kirishima and Sero, of course I could solo it but having some teamwork improvement might be useful so I'll try to be as inclusive as I can.

The first battle was team Izuku (Heroes) vs team Bakugo (Villains).

Everything went just like the canon, Bakugo started the battle using a huge blast destroying part of the lower building and Midoriya destroyed half the building with a punch, creating an air current that allowed Uraraka to defeat Iida and grab the "Explosive".

After Midoriya was taken to Recovery Girl All Might asked who did the worst and who did the best, and Momo answered just like in canon.

"W-Well, young Iida also has parts of him that could be more relaxed...but well... that was correct!" Confirmed All Might. "We should always start with the basics to develop depth of learning. We must strive to devote ourselves wholeheartedly. Otherwise, we cannot become top heroes." Complemented All Might.

After that came the 2nd battle: Shoto Todoroki & Mezo Shoji (Heroes) vs. Mashirao Ojiro & Toru Hagakure (Villains).

The match was disappointing Todoroki froze everything ending the battle in an anti-climactic way.

Finally, it was my and Tokoyami's turn. Fumikage Tokoyami & Kobayashi Kaito (Heroes) vs. Eijiro Kirishima & Hanta Sero (Villains).

[Outside the Building]

"So…any details I should be aware of your quirk?" I asked.

"My quirk allows me to manifest a sentient shadow monster from within me known as Dark Shadow, the time I can have Dark Shadow out of my body varies however it is substantially less the brighter the environment is, and in case it is too dark I'll lose control over him making me go berserk." Tokoyami Explained.

"All right I'll go next, I have this gadget that I call Nezuko, it is a somewhat sentient sachet that connects with a pocket dimension from which I can take out all of the weapons I possess, however I have to put at least my hand to pull it out, Nezuko cannot take the weapons and gadgets by her own means." I started explaining.

"What about your monstrous strength?"

"I use some breathing techniques to make my body stronger and combine them with swordsmanship to create powerful slashed." I ended.

"So, any ideas on who looks for the bomb and who distract the 'villains?"

"Well, that's a toughie, on one hand the building is dark enough I believe so that you are at top power but not berserk but on the other side the moment Kirishima wrecks the building its game over for you."

"So, what should we do?" Tokoyami asked with a worried face,

"We'll improvise of course." I smiled.

*RING*

The alarm sound and it meant the start of the test.

Tokoyami and I entered the room, I knelt and extended my arms, while Tokoyami put himself in a defensive position.

"Beast Breathing Seventh Form: Spatial Awareness" I mumbled and then utilized my sense of touch to identify the position of enemies and their weaknesses by feeling small disturbances in the air.

I felt Kirishima and Sero three floors above us, Kirishima's Hardening is not at a point where I can't cut yet so I'll take full advantage of that, and with the amount I saw on Sero's elbows I calculated that he wouldn't run of it during this test.

"Third floor last right door from the stairs, Kirishima is coming to stop us and Sero has prepared traps, I can deal with Kirishima, you can position yourself at the other side of the building, use Dark Shadow to climb the outside of the building, surprise Sero and subdue him as fast as you can." I told Tokoyami.

Tokoyami nodded and we went our separate ways. I was walking through the stairs when suddenly Kirishima jumps out of nowhere and destroys the stairs and we engage in combat.

"Whoa you dodge that, well there goes my sneak attack." Said Kirishima getting in an attack position.

"Well sneak implies that I don't know your position but your fighting spirit was all over the place." I replied.

"That so well let's fight!" Kirishima rushed at me.

I ran away and went out of the building, not because I was scared but because real situation-wise it would be idiotic to battle near an explosive.

Kirishima and I were outside the building and started fighting. My swords clashed against his hardened fists, I decided to let his guard down by not showing that I could cut him otherwise he might be less predictable.

While clashing I felt Tokoyami reaching the 3rd floor so I decided to end this. My sword cut Kirishima's arm and he was shocked.

"How did you cut me!?" Kirishima asked surprised.

"I my dear classmate was doing what the old saying implies 'being a wolf in a sheep's clothing' meaning I was deceiving you about my true strength" I said while I unsheathed my swords.

"Harden yourself as much as you can Eijiro-san, otherwise you won't survive this." I said getting into a stance with a menacing grin. My right arm was behind my neck holding my swords horizontally and my left arm was doing the same but in front of my face with my left elbow being as horizontal as my body allowed me.

Kirishima started to run back at the building, a mistake o he would regret.

"Never give your back to the hunter Eijiro-san." I finished my stance.

"Hunter Breathing Second Form Enhanced: Senhachiju Pound Ho!" I screamed and jump and performed a circular swing that launched an air compressed projectile spiraling towards Kirishima.

The attack connected leaving a mark in Kirishima's back, it was strong enough to knock him out but not that strong to leave a scar. Kirishima was blasted away and was sent towards a building being knocked out.

"Maybe I went a little too far." I said after seeing Kirishima's unconscious body.

"YOU THINK!?" Said the voice of everyone in the speaker.

"Hehe I better see how Tokoyami is doing." I said as I went to the building.

I used continued spatial awareness to check my surroundings, when I reached the room, I saw Tokoyami tying up Sero with his own tape.

"Where's Kirishima?" asked Tokoyami.

"Nurse, I went too hardcore on him, my bad." I said while scratching my head.

Both Tokoyami and Sero gulped when they heard that.

(After the practice)

"Good work everyone! We didn't have any major injuries other than young Midoriya and young Kirishima, either! You guys took this on seriously! You all did a good job for your first training!" said All Might. "Young Kobayashi, I will ask you dearly to control yourself better in future practices." All Might told me with a serious look.

"I will, sorry" the class sighed in relief when they heard me say those words.

And with All Might telling us to return to change the practice class ended.

Creation is hard, cheer me up!

I'll leave Zoro's attacks in Japanese it sounds better.

Next time in Reborn in My Hero Academia as a Demon Slayer: "Broken Pride and the Class Rep".

Hope you like it.

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