Reborn in My Hero Academia as a Demon Slayer.

"My name is Watanabe Kai I am 20 years old and currently I am dying, yeah I know you must be wondering how I got myself this fucked up huh? we'll let us start from the beginning then"

"I was born in a ok family we were not rich nor poor and we all loved each other, my dad was a worker at the cable company as for my mother she was a vet, they were not the busiest parents so they always smothered with their love which was quite nice if I say so myself, as most of the Japanese population I was fascinated by anime and manga although the ones that truly marked me were kimetsu no yaiba and my hero academia both which were pretty straight forward, one was about killing demons with cool sword techniques and the other one about heroes vs villains so it's easy to love them".

"Yes, yes I know I'm bitching too much about my life but for fuck's sake I'm dying my life is literally flashing through my eyes cut me some slack.... ok where was I ah yes, the day of my death, it was a normal day I went to school, studied and went back home, when I returned, I realized that there was no more milk in the fridge so as a responsible person I decided to go and buy some".

[Third person POV]

"Darn there's no milk and it's such a hot afternoon but o well it's just an easy errand so it shouldn't be any difficult" said Kai without knowing how much those words would curse him.

while arriving at the store Kai quickly bought the milk and made his way home until he heard something.

"What was that noise" said Kai while hearing a screeching sound.

after he looked back, he saw in the distance a car moving in a very erratic manner under normal circumstances he would get out of there as any normal person but then he saw a little girl running at a pace that would make her to line up with the car (the reason the MC knows this is because of his high IQ and yes, it is possible to do it in real life you just need to be smarter).

"God fucking dammit" said Kai while rushing at the girl dashing with all his might, while he reached her, he pushed her just in time so that she would not suffer any injuries however, the same could not be said about Kai.

*CRASH*

"It hurts" was the thought Kai had the moment he was flying due to the crash until he crashed into a wall his whole body smashed his limbs were in unnatural positions and even his left leg had its bone popping out his ribcage was shattered and bone fragments were stabbing his lungs and heart, needless to say he was not going to survive this but, despite this he was still conscious.

*AAAAHHHHHHHHHH*

The loud cry of the bystanders was the only thing Kai could hear, after the noise died down a little Kai heard a voice calling him.

"Mister mister please wake up" it was the girl who was crying trying to help Kai.

Kai was still conscious and wondered "why did I risked my life to save her? could it be that reading all that manga gave me the guts to do this? nah I simply thought it was she didn't deserve to lose her life while I had the chance to help her, but look where it got me".

"Mister mister why did you did it, why did you helped me" the girl said while busting into tears.

hearing this Kai slowly answered "I... *cough*...*cough*...I didn't see it fair; I had the ability to help you and if I were to walk away after doing that, I felt that I would regret it for the rest of my life, it was foolish, it is painful and in the eyes of everyone else I may look like a fool but even now I don't regret it".

"But look at yourself you are hurt and are barely awake you didn't deserve this; it should have been me who should have gotten hurt" said the little girl crying.

In that moment Kai gathered all of his strength into his arm and smacked the little girl head.

The little girl rubbed her head while crying and asked Kai "why did you hit me?" Kai stared at her while panting and said "never….*ha*…*ha*…never say that you would rather suffer" while hearing his words the little girl was in shock she couldn't believe what Kai was saying.

"Why not it is because of me that you are hurt, I don't want to see anyone hurt so why is it bad to say that I should be the one getting hurt?" The little girl aske with some anger in her tone.

"Because you are looking down on my life" Kai said making the girl confused which he explained "everyone live their lives doing everything they want, be it study or play or hurt or help others it doesn't matter, each action was made for the sole purpose because we wanted to, while saying that you are looking down on my action of helping you, yes I am going to die and yes it hurts so much I feel like I can't breathe but, I feel fulfilled to see a person whose life was in danger like yourself being safe again and for me that is all that matters" Kai said while almost passing out, at this point Kai had managed to remain alive through only his sheer will but at this point he is too injured to remain conscious.

While passing out he heard a voice "thank you my hero" when Kai heard the little girl's voice while passing away, he smiled he died smiling while the little girl hugged his head.

After that Kai found himself in a dark place and he strangely could feel he's body but couldn't feel anything around him, which brings us to the present.

"And that's basically it that's all I remember the day I died, man if I knew I was going to die I would have seen the movie world hero mission oh well what's done is done I guess, I hope that girl is fine and my death didn't traumatize her I was being as nice as possible so if that was the case then fuck me, I hope mom and dad overcome this I hope they don't let this get to them".

While thinking about this Kai saw a bright flash of light in front of him, at first he couldn't se a thing but after a few seconds he saw the silhouette of a man, the man was dressed with a white jacket and leather pants while using a cap backwards, the being stepped forward Kai and said:

"Ey yo how are you doing im the God of karma Wexof and im here to give you your reward for having such good karma" the being said while posing as if he was part of the Ginyu force.

Perplexed at seeing this Kai only had one thought ´The FUCK!!!!!´.

Little did Kai would know that he was about to embark in an adventure that surpassed even he's wildest dreams.