Narrator POV

Izuku is now 10 years old

It's been 6 years now, six years full of abuse, bullying, harassment, and neglect. His sister and her friends didn't stop, they grew stronger and abuse our little cinnamon roll every day, the little couldn't even rest at home because he has to make his own food since Inko stopped making him food. Now you must be wondering why he called her Inko, that's because he doesn't see Inko and Toshi as his parents. They're not even his real parents, to begin with, Izuku might be 10 but he has an IQ of 240 which is 5 points behind Nezu ( Nezu is 245) but let's be honest, even a dumbass could see that he's adopted. Izuku is now used to the pain not only because of the daily beating but because he started to cut himself 2 years ago, he wanted to control something in his life, he wanted to feel like it was his choice.

It was the end of the school day and of course, Izuku was bored AF cause he has already completed the curriculum of the best university in Japan. Finally, the bell rang and he started to pack up his stuff but of course, he wouldn't go away like that

Katsuki" Oi Deku where the fuck do you think you're going!"

Izuku " Home" he responded with a bored tone

Izumi" Deku why are you even here, you should just stay at home if you're gonna slack off

Shoto and Shoko just stayed silent because they didn't want to insult him even though they have already hurt him

Katsumi" Honestly you should be ashamed to be his sister, Izumi"

Katsuki"Oi nerd what's that "Hero analysis" oh please you still think you can become a hero you're just a Deku without any future"

Katsuki" you know what there is a way for you to get a quirk"

Izuku just stares at him with the same boring look.

"Jump from the top building and wish to have one in the afterlife"

Immediately, Katsumi, Izumi, Shoto, and Shoko widen their eyes and thought the same thing

"What the fuck are you saying we want him to stop trying to become a hero because we don't want him to die"

Izuku" You know what, it might be a good idea, thank you Katsuki" and he left the classroom

The group stop dead in their tracks, they couldn't process what he just said, and then...

Katsumi" Are you dumb or what we don't want him to die you fucking grenade"

Shoto" You went too far"

Izumi" But he wouldn't go that far-right?"

Katsuki" No he won't he doesn't have the balls to do it"

Izumi is now seen at the school gate and sees her parents waiting for her.

Izumi"Hey mom dad what are you doing here."

Toshi"It's your birthday in one week so we're here to pick you up to go buy what we need for a party

Inko" Yeah now let's go, baby"

"Okay mom"

Then they went to buy everything they need

Meanwhile Izuku POV

I just arrived home, I directly went towards my room to heal my new wounds. I grabbed some food some water, and my backpack, why? because I'm getting the fuck out of here. I just can't take it anymore, I'm sure that they won't even see that I'm not around anymore. I then put my hearings that I found in a box one month ago.

Flashback 1 month ago

I was chilling in the basement because at least here no one would be there. Then I saw a little metal box with a sunset on the top of it. It was like the box was calling me, it wanted me to open it so, of course, I did. And in there, I saw a letter and earings with the same sunset that is on the box

I open the letter and started reading it

Dear Izuku, If you read this it means that I'm no longer here, I hope that you're happy with you're life, I'm sorry that I am not here with you, I don't have too much time so I'm going to go straight to the point, your real name is Tsugikuni Izuku, and I'm Tsugikuni Maya, your real mother, there is a high probability that you were diagnosed quirkless which is normal, you do not have a quirk but something way more powerful. A long time ago, when quirks didn't exist, there was a power called Breathing Techniques, like the name, these techniques use the breath of the people who use it, these techniques were used to slay demons and these people were called Demon Slayer. Their goal was to kill the former demon Kibutsuji Muzan when they killed him, the demon slayer corps was disbanded and the breathing techniques were forgotten. All of the families who used these techniques disappeared. Your ancestor, Tsugikuni Yoriichi was the first user of the breathing technique, he was using the Sun Breathing, the Sun Breathing is the former breath, all other breaths are variants of this one. Izuku, you're the last one in the Tsugikuni family and the last one who can use a breath technique. But the other family didn't disappear like that, they were killed by a man who was scared of our power, Izuku the Sun Breathing is the strongest breath, the only breath that can kill that man. I entrust this task to you Izuku, you're the only one who can kill him, the only one who can learn the breathing technique. I know it's a tough job but I believe in you and never forget that no matter what I will always love you and be proud of you.

As I was reading this, tears were running down my face, my real mother said in one letter what I always wanted to hear, so in my life, someone loved me and was proud of me, moreover, I'm quirkless because I can learn something more powerful, don't worry mom I will make you proud I won't betray the trust that you put in me.

Flashback end

I didn't put my hearings every day because I was scared that these bitches would them away from me, I absolutely can't lose them, when I wear them, it feels like my mom is with me.

"So I have everything with me, time to leave this hell"

I left a letter because I didn't want people to search for me I wanted to say to the people I care about that I am gonna be okay.

Time skip a few hours later

I was just walking around without any real destination until I dumped into a tall man in his 30s with light red short hair and light red eyes. I immediately apologized.

Izuku" I'm really sorry mister I didn't mean to bump into you "

???" It's okay young man I'm not...

He suddenly stops talking and keeps staring at me.

??? POV

I was walking in the street when a kid bumped into me, he quickly apologized and just that is okay but I stopped dead in my tracks, these earrings, this mark on his forehead, no it's impossible, they all disappeared unless

"Tell me kid what is your name"

He looked at him with a doubtful look. Of course, I'm a complete stranger to him but he finally said it.

"My adoptive name is Izuku Yagi but my real name is Izuku Tsugikuni."

I looked at him with wide eyes, I can't believe it, he was really Maya's kid. I just pull him into a tight hug.

Izuku POV

I was really surprised when he hugged me but I feel like I can trust him so I returned the hug.

"Tell me Izuku what are you doing outside at this hour"

I then proceeded to tell him everything from the neglect to the bullying, the letter, and the breathing. As I was talking, I can see him fuming in anger, not gonna lie it felt kinda good that this man care about me.

???" I see so that's why tell me, kid, would you like to come live with me and my family. I can't let the child of Maya alone in the streets, I could also train you."

"First how do you know her name, second what is your name, third why would you take me, and fourth how would you train me?

The man just laughed a little before replying.

"You're pretty intelligent for your age.

"Thanks my IQ is 240 now please answer the question"

"Holy shit you're a fucking genius, well my name is James Vermillion, I know her name because the Vermillion and the Tsugokuni are friends for a long time and your mother was like a big sister to me, I would like to take you because you're basically my family even though we are not blood-related and in my house, I have a book that explains how to use the Sun breathing but I can't open it, only a Tsugokuni can open it and I could train your sword skill."

I sensed that he was saying the truth so I don't see why I shouldn't come I need to become stronger.

" Okay then I would be in your care"

"Great now let's go our plane is in one hour"

"Wait plane? where do you live?

" I live in Paris"

I widened my eyes, I'm gonna go to France, I always dreamed to go to France!

" Is there a problem"

"Not in the slightest I was just surprised, it's my dream to go to France"

"I see it's great then let's go"

It was the beginning of my journey to become the last Demon Slayer and become the strongest hero.

Meanwhile with the Yagi

Toshi, Inko, and Izumi are seen in a random store, they are trying different clothes because they're going to throw a party for Izumi's birthday and of course, The Todoroki's, the Bakugo's, Midnight, Present mic, Eraser, Nezu, GT, RG would be there so needed to make a good impression.

Izumi "Mom what do you think about this one" she was wearing a white and blue dress.

Inko " You look beautiful in this one my baby"

"Thanks, mom I'm taking this one":

"Are you sure you don't want the other one as well?" she said while pointing to a mountain of clothes

"Nah it's right mom it's quite expensive"

Suddenly Toshi popped out of nowhere.

"Stop spouting nonsense, nothing it 's too expensive for you"

"Okay so I'm taking them all"

"Great"

After paying, they left the store and decided to go home, after some time walking, Toshi and Inko stopped walking so did Izumi, Toshi started to talk.

"Izumi there is something that I and your mother have to say"

"Okay dad what is it"

Suddenly, her dad buffed and was now...

"I'm All Might and your mom is Green Majesty"

"Oh my god, dad you're All might, I have to tell Izuku he would absolutely freak out"

"No young Izumi you can't tell him, it has to be a secret between us"

"But why? " she said while tilting her head to the side trying to look cute.

"Because Izumi you shall inherit my quirk"

"But Dad you can't transfer a quirk it's impossible"

"You see my quirk is called one for all and I can transfer it, by the way, I'm the 8th user and you shall be the 9th."

"But why don't you give it to Izuku he doesn't have a quirk, he needs it more than me"

"Because young Izumi, your brother doesn't have the spirit of a hero, every day when he comes back from school and goes to his room whereas you train your body to become a hero"

"Okay dad I accept" Don't worry onii-chan I'll become a hero for the both of us and then you would be so happy for me that you would confess your love to me hihihi.