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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 und Comics
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56 Chs

VS UA Teachers Part 2.

Kaito dashed towards Eraser with all his strength while keeping his sword back. He suddenly gets behind him and aims to slash his back, Eraser blocks with his dagger but Kaito's sword maneuvers through the block with its unique shape to still slash him.

'Serpent Breathing Second Form: Venom Fangs of the Narrow Head!' Kaito.

Eraser grunts and Kaito kicks him back and tries to go for another attack but is interrupted.

*BUUUZZZZ*

A soundwave hit Kaito in the torso and pushed him back from Aizawa, he looks at the direction of the move and saw Present Mic with his mask changed in form.

One of Mic's weaknesses that Kaito remarked is that his attacks are mostly AOE, with not enough physical build to fight either, he's bound to injure allies when they're inbound. To correct this, Power Loader and Mei created a mask that could focus Mic's voice into a specific direction to prevent said scenarios.

He already had one, true, but this one is an upgrade that can focus Mic's soundwaves even better.

Kaito smiled at this change and threw Obanai (the sword of the Serpent Breathing) upwards. He clapped his hands and took Kanroji (the sword of the Love Breathing) out of her sheath and rushed at Mic.

"YEEEEEEEEEEAAAAAAAAAHHH!!!!!!" Present Mic.

The scream was pushing Kaito back but he pierced the ground with Kanroji and hung on against the soundwave. Like those guys who hang in the back of a jet ski, what's that called?

Eraser took a breath before realizing where Obanai went. he looked at the sword falling towards Present Mic's head and he used his earpiece.

"You've got incoming, Hizashi!" Eraser.

He looked upwards and saw the sword falling on him, he moved back and the sword fell. Kaito took the chance to impulse himself with the lasso-like sword as he took Obanai once again and threw it at Present Mic.

Present Mic dodged the attack but Kaito managed to cover his hands in Kanroji's embrace. Feeling the cutting sharpness of the sword, Present Mic was unable to escape.

"Now then, how to deal with you?" Kaito wondered as he looked at Eraser.

"Don't count me out of the party just jet." Present Mic.

Kaito looked back and saw the "knot" of the sword expanding as Present Mic was muttering something beneath his mask.

Kaito immediately took the swords out and separated the knot but was received by a shockwave that pushed him back. His ears were ringing as he failed to stand up, he felt as if he received a hundred flash grenades at once.

Managing to look at Present Mic Kaito somewhat understood how that shockwave happened. Present Mic's arms and palms were covered with his shirt and gloves so Kaito didn't think of anything suspicious.

But now, he's seeing said arms and hands covered in some sort of metallic exoskeleton.

"Cool, aren't they? It was a great solution to my other weakness." Present Mic.

Since he wasn't physically competent for close combat, Mic brainstormed about ways to enhance his strength, the solution? Taking his powerful voice into account Power Loader made new discoveries thanks to some more modern tests.

It would appear that Present Mic's quirk can only activate by enhancing his voice and yelling, but it turns out, his voice is already being enhance, regardless of volume. Taking this into account, he was tested if his enhanced voice could work on low frequencies that humans are unable to hear.

He succeeded. And the fruit of those tests was an exoskeleton that could stockpile said frequencies and gather them in a single spot before being released, essentially transforming that low sound into a powerful noise bomb.

Kaito immediately took some pellets from his pants and threw them on the ground. The smoke encapsuled both him and Present Mic but the latter rapidly backed off from the smoke, leaving Kaito inside of it.

*CLAP*

Kaito's clap was heard and Present Mic began to screech once again.

Some sounds were coming from the smoke but no one could notice that due to Present Mic's scream. The soundwave cleared the smoke and revealed that Kaito was nowhere to be seen.

Present Mic looked around but couldn't find Kaito anywhere. Eraser, on the other hand, was preparing the "stage" they had to truly test Kaito's limits.

"Hizashi, I'm in position with the rest. I need you to draw Kobayashi here." Eraser.

"Well, Shota, the thing is that… I lost him." Present Mic sheepishly said.

"What?" Eraser.

"He's nowhere to be seen. After my Encore Shock Blast (the name of the move he used) he dropped some pellets and disappeared." Present Mic.

"He must be hiding somewhere. Keep your eyes sharp." Eraser.

"I'm afraid that won't work, Shota." Nezu spoke from the earpiece.

"What's the matter, Principal?" Eraser.

"It appears that Kaito-kun has gone underground." Nezu spoke while seeing the rewind of the footage.

Kaito dropped the pellets and the moment Present Mic was out of the cloud of smoke he clapped his hands and summoned Nezuko, he then took out his claws from within to dig a hole and went underground, he even had time to put the footing back up to leave no trace.

"Crap, the device can't reach underground yet." Present Mic.

"That's why I advised you to focus on versatility. Anyway, Kaito-kun must be expecting your next move so, proceed with the plan as we accorded and keep everyone in position." Nezu.

"Understood!" Present Mic/Eraser.

As they made their way towards the designated area, Kaito was brainstorming underground.

"Hmm… they're much stronger than I expected, perfect for the war but I'm still unsatisfied. If I really need to go all out, then I think its better to use Sun Breathing during the remaining of the fight." Kaito.

He clapped his hands and searched through Nezuko. To make his techniques more practical, Kaito decided to make one sword, or swords, that would adapt perfectly to each breathing technique in his arsenal.

These are named swords after their respective breathing users and or owners. However, five of these swords were above Kaito and would probably be confiscated by the teachers as he remains underground.

Of course, he's not short on options but he still needs to do something about the end of the battle. Since Sun Breathing takes a huge toll on his stamina for whatever reason, Kaito took a yellow katana in a white scabbard before using his claws (weapon) and dig his way up.

Once up, he noticed no one on his surroundings, his swords included, so Kaito decided to activate Spatial Awareness once again to locate the teachers.

He found all of them on the area near the exit but he knew it was most likely a trap. Kaito took a running position and breathed.

'Thunder Breathing First Form: Thunderclap and Flash.' Kaito.

With a dash as fast as a lightning bolt, Kaito traversed the area rapidly to engage against the closest teacher. Unfortunately, the terrain changed its shape and Kaito found himself dashing through an iced floor.

Unable to stop from the inertia and acceleration, Kaito jumps to find a safer footing, but the cunning principal had already planned out for anything Kaito might have in store.

Midnight appeared from one of the walls and with her whip grabbed Kaito's left foot. Kaito wanted to cut the whip but a sudden bullet shot by Snipe changed the trajectory of his slash, giving Midnight enough moment to smash Kaito against the wall.

(Kaito was the one who requested this treatment, they're holding back but they're also giving their best to beat him.)

Kaito got off from the wall but was received by three shots from Snipe, using special bullets of course, but still left the hole in the wall and charged towards Midnight.

With his speed controlled due to the iced floor, Kaito prepared to deliver a slash. Suddenly, the floor below Midnight began to tremble and it elevated itself, safely moving Midnight from Kaito's attack.

"Cementoss-sensei." Kaito.

Kaito saw every teacher but All-Might entering the training area, given their quirks and compatibility, he had guessed: Eraser, Present Mic, Midnight, Cementoss and Snipe correctly thus far. Without counting Nezu, he has a follow up plan against these 5.

Kaito's train of thought was interrupted by another bullet from Snipe but he was able to parry it. Kaito began to rush towards Snipe's position but he saw how the earth below him "swallowed" him.

Kaito immediately stopped and looked around him. He noticed some parts of the floor were full concrete but others were actually metal, like the ones that are still iced. With Cementoss being the support and the metal floors having unknown effects, Kaito knew that he has been played.

Another pilar rose from the ground and bended itself to attack Kaito, Kaito dodged but another smaller pillar appeared from the one that attacked him and manages to hit him in the chest.

Kaito backflipped to reduce his inertia but was received by a drop kick from Eraser. Eraser quickly threw a dart at Kaito's neck artery and hits, injecting him with some sort of liquid.

Kaito takes the dart off and tries using his mask for another analysis of the substance but the mask gets shot by Snipe, breaking it completely.

"Seriously?! You know how much Mei's gonna complain about that?" Kaito.

He then felt tired, extremely tired, as if he hadn't slept for a whole week.

"This is a serum created from the concentrated pheromones of Midnight. Just inhaling them makes people faint, what do you think would happen if it's injected in someone?" Nezu spoke through a speaker.

"You think this is gonna keep me down?" Kaito.

"Kaito-kun, you're still holding back, aren't you?" Nezu.

Kaito's eyes widen.

"You've had many chances to escape the ambush, you could've subdued Hizashi-kun without him using his new gadgets. You could've evaded this dart. Why're you holding back?" Nezu.

"…" Kaito.

Why was he holding back? This test was supposed to test his limits. The problem is that Kaito cannot bring himself to do that.

He's always read these characters as an essential part of his life and the way they lived and expressed themselves was like magic to him, except Bakugo for obvious reasons, and the thought of harming these characters he loves pains him.

He was the one who proposed this in the first place, but he can't see himself capable of doing it, something he just noticed once the test started.

"You're a kind kid, you don't want to injure those around you, do you?" Nezu.

Kaito remained silent.

"Well, if you're not going to give it your all, I suppose this was a failure." Nezu.

Kaito breathed heavily and looked at one of the cameras.

"Once... I fall... take off… your weights…." Kaito.

Everyone was a bit confused at the statement while Kaito fell into slumber.

"Everyone, don't lower your guard." Nezu.

The teachers fell back a little waiting to see what would happen.

Kaito's body began to twitch a little before his right arm moved and pressed itself against the floor. So did the rest of his limbs until Kaito stood up and held his sword.

"That serum should've been enough to leave him knocked out for hours." Eraser.

"I don't think he's awake at all." Nezu spoke through the earpiece.

"Snipe, send a warning shot." Eraser.

"Roger." Snipe.

He shot a bullet at Kaito's feet but Kaito deflected the bullet with no problem.

No one saw when Kaito even unsheathed his sword and grew wary.

*SSSSSHHHHHHHH*

The heavy breathing between Kaito's teeth was the only thing the teachers could focus on right now.

"Thunder Breathing First Form: Thunderclap and Flash." Kaito.

As if he had disappeared, Kaito made his way towards the structure Snipe was on top off and cut it in half faster than everyone could react to.

*CHINK*

As the sword sheathed, the whole structure began to break down into smaller pieces and Snipe fell. Kaito didn't wasted another second and immediately jumped between the debris to deliver a slash at Snipe's chest.

The slash was done with the dull side of the katana but Snipe was sent crashing towards the ground. Kaito simply left himself fall but recomposited himself before he hit the ground, now standing up menacingly while looking where Snipe is.

He raises his hand and says:

"Come on." Kaito.