"Where am I?" questioned Izuku as he sat up on the be- wait bed?! His eyes immediately widened as he scanned the area. It looked like the infirmary back at UA, except less modern. [

Past events came rushing into him as he remembered all that happened in a span of a few hours. Izuku couldn't actually believe that he was in another world, especially when it's a world where there's man eating demons.

Before he could think more, the door slammed open to reveal a short twin pony tailed girl. Her hair was black with the tips being a shade of blue. Her eyes were also blue as she walked in with a mutual expression plastered on her face. She was holding a tray full of cups filled with... medicine?

exclaimed the girl named Aoi.

He could only nod his head as his hands reached out to grab the wooden cup. The medicine tasted gross, but he couldn't actually complain. After all, he was getting treated without paying anything back.

said Aoi as she started to leave the room.

Izuku quickly replied before she left.

With that, she closed the door, leaving him to his privacy.

'Patrolling, are they the demon slayers the description was talking about, if so, I have to ask one of them to train me. I'll have to get to hashira rank or whatever it's called to complete a part of the quiz.

Then I could likely meet Tanjiro and his sister once they join. though I don't know the timeline, neither do I know if they're already a demon slayer.

With a sigh, Izuku hoisted himself off the bed before going downstairs. The only question was, how do you get downstairs.

The place was huge and for some reason, he felt himself walking in a circle. 'Where the hell are the stairs' Izuku though in fustration.

He was still aimlessly walking around the hallway when he bumped into a petite figure around the corner. Lifting himself up, he quickly lent a hand towards the mysterious girl.

'The girl has the same butterfly hairpin on like the other girl' he internally said, remembering the fact.

Now looking at her, she had black hair tied to a side ponytail with eyes devoid of emotion. 'What happened to the girl'

She didn't move as Izuku found it being a little awkward with his hand outstretched. A few seconds past before she took out a coin out of nowhere, tossing it up before catching it.

She slowly got up as she walked away without a word. Izuku was left speechless as he tried comprehending what just occured.

"" Izuku questioned the mysterious girl

Doing the exact same process with her coin, it landed in heads.

she answered quietly.

'Her voice was so gentle and monotone' He thanked her before following the directions he was given. Izuku found the stairs as he was lead to a kitchen.

Turning to the voice, Izuku found a very attractive woman with long black hair. Having curtain bangs and light violet eyes. She had a butterfly patterned hoari on with a katana in it's sheath, resting on the woman''s waist.

"Uuuhhhh.... h-hello" confusingly introduced Izuku, internally headbutting himself when he stuttered. He had thought that being around many class 1A friends would stop his stupid stuttering in front of meeting new girls, but .

The woman giggled in response as she then introduced herself. "

Izuku cleanly lied as he though about what she had said.

'P-patrol! She must be a demon slayer, explains why she had a nichirin sword. If she's okay with it, she could train me to become a demon slayer so I could find Tanjiro. That way, I could reunite with my friends and relatives faster.

Izuku steeled his nerves as he stood stiffly in front of Kanae, determination flashing in his eyes. In a quick motion, his head banged the ground as he positioned himself in a begging position.

yelled Izuku

________________________________________________________

'How did it come to this' Izuku thought

Izuku panted out, swinging his sword down once more.

exclaimed Kanae as she still had her happy face on.

He had thought this was going to be easy, no one said it was pure torture. It was a good thing that he was able to have the experience of cleaning the beach in 10 months, or he would collapse after 50 swings.

It had currently been a year since the day he practically begged her to train him and it proved to not have been useless. His body grew more dense and hard as his stamina sky rocketed.

According to his master, he had been able to adapt to total concentration faster than normal people. It would usually take more than 5 months to learn, while he only spent 2 weeks.

He had an abnormally large lung capacity and was able to master swordsmanship faster than all her other tsugokus. Izuku could still remember the day she accepted him as her student, although a bit hesitant.

In a begging position, he yelled with passion, holding a little meaning into it, "Please train me!"

An eerie silence came as Kanae was shocked by the straight up answer. She was hesitant to train him as she hasn't had a tsugoku other than her sister shinobu before.

Even if she hasn't had much experience, she wasn't going to a boy with boundless determination get wasted.

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3 years passed by in a flash as Izuku set out for Final Selection. Kanae gave him a spare sword to defend himself in final selection as all the members of the butterfly mansion waved a goodbye.

Izuku's expression over the years turned stone hard as barely any emotions seeped through the mask. The only timed he actually showed much emotion and care was when he was near one of the butterfly girls.

Over the years, he was able to learn flower breathing fairly quickly as his speed and strength were nearly on par with a hashira, after all, these harsh training and the blessing ability to adapt to any environment/predicament definitely helped. He was like a prodigy, having natural abilities to be able to use these breathing, just like .

On the other note, he found out he could still activate one for all, but, decided against using it to stop relying so much on it. He was able to control up to 60 percent as total concentration constant expanded Izuku's muscles quit a bit.

Not to mention, Izuku started hallucinating a person with tied up red hair, hanafuda earings, a long bright red sword and emotionless eyes, completely deprived from any type of emotion around two years into training.

The mysterious man performed one of the most beautiful breathing styles Izuku has ever seen as the flames were stronger and more precise than flame breathing .He was so captivated that he decided to learn it.

In his original world, Izuku had always been good at examining heroes as his eyes concentrated at how the mysterious man performed what Izuku could only guess as sun breathing from the little information written on the blurb before he entered this world.

Izuku was able to practice a little of sun breathing before final selection but that didn't stop his lungs from feeling like they were burnt to ashes when he overused. It would be fine if he just focused on flower breathing in the final selection.

Due to Izuku's smart nature and quick thinking abilities, he came up with the most logical explanation for why he had the ability to unleash sun breathing.

Since he was coincidentally the protagonist of the hero world, the day he came here, the fate of all the people/demon have changed. The world had blended to fit Izuku in as he wasn't suppose to even exist in the world of demons.

Since there's now two protagonist in one world, the two , Tanjiro and Izuku, had blended their powers together. That would mean, Izuku had the power of one for all and an additional legendary breathing named sun breathing, while, Tanjiro had sun/water breathing....