Midoriya was tired and exhausted.

It had been a long and arduous 10 months of cleaning the beach but today was the day he would finish. He got there at the same time he always got there at 4am. And when all might arrived at 7am he had just finished clearing the beach.

"Well done young midoriya, it took you longer than i had hoped but i knew that you could do it in the end… EAT THIS"

Midoriya stared at his idol in amazement and utter confusion…

"Eat this?!"

"YES YOUNG MIDORIYA, you must consume my DNA in order to claim one for all. And given i don't want to prick open a vein, hair will have to do.

Midoriya ate the hair

Almost at once something happened and midoriya was scared his limbs were not strong enough for the quirk and he was about to explode

A green and orange holograph emerged from Midorias' shoulder. And started talking.

"FINALLY I'M FREE, 120 YEARS AND I'M FINALLY FREE AGAIN."

All might look perplexed as well.

"Um you're not one for all are you?"

"No my name is kurama, i was a third quirk added onto one for all in order to try to give comfort to the first wielder, unfortunately because i wasnt apart of the original merging of the 2 base quirks i have been forced to remain dormant through the previous 7 wielders, and only now has the quirk evolved enough that i am able to manifest at all. Normally I'm almost 20X stronger and larger than you see me now but because of your current level I can only appear like this."

"This is both great and horrible" all might said "how are we gonna explain how midoriya never had a quirk before and what exactly are you because i have never even heard of a whisper from my master about you"

"Well the first part of your question is easy enough to answer. I am clearly intelligent and am also withholding my true power or else midoriya would probably explode from the sheer force of my abilities. If we are ever asked about why i never appeared sooner we can just say that i was intentionally remaining dormant in order to protect midoriya all while building up his body in order to finally be able to appear. Does that work for you 8th"

"I supp…"

"Are you real?" Midoriya asked

With a smile on his holographic snout "Yes i am, and i am yours, i will be your best friend, i will help your body bear the load of one for all, i will heal you injuries at a rapid pace so you can output more power, and i will never leave you until you decide to pass me and the quirk on to your own successor."

Midoriya broke out crying and hugged his solid hologram friend.

All might interjected "young midoriya i know that there is a lot to discuss and a lot to figure out but you must go to UA the entrance exam is starting soon."

"Yes my partner we must leave now i can assist in transport. I have been locked up for far too long."

And like that midoriya's legs were covered in an orange light and midoriya felt stronger than he had ever felt in his entire life and they took off toward home then after a quick shower on to UA.

When he arrived at ua he was not paying attention and tripped and just before Kurama stepped in to stop midoriya from face planting midoriya was weightless.

"Little clumsy there aren't you." a girl with brown hair and pink cheeks said

"Yea… just super distracted, I mean so many heroes have trained and learned here…." Midoriya rambled on about heroes and what he hopes to do until the two of them make it to the test room.

"Alright I got to go over there next to my classmate." midoriya said to ochako

"All right i will see you in class"

"Kill yourself nerd" kachan said as way of greeting

The written part of the exam went off without a hitch and midoriya did quite well

As the kids went off to the separate testing grounds for the practical part of the entrance exam, kurama and midoriya had a conversation in his mind.

In his mind space kurama was a real fox not a holograph and he was huge almost 100 feet tall sitting down

"For this exam I'm going to coat your limbs in my energy and take the brunt of the damage. We can only go at about 5% of one for all at the moment and that's with me helping. Under no circumstances are you to even attempt to use more of the power, you would shatter every bone in your body if you did it wrong and I don't feel like having to heal you that much after only having woken up."

"Understood"

And then the bell to start the test blew and midoriya took off getting point after point with kurama's energy surrounding him he felt invincible… until he saw the 0 point robot about to crush Uraraka and though knowing this was going to hurt like hell midoriya jumped into the air at a full 100% power and absolutely DESTROYED the robot.

And shattered 3 of his limbs along the way.

Despite his previous grievance about overusing the power Kurama was proud of how he risked his life to save someone. And gladly started to heal his wounds

Recovery girl arrived and was very confused. Not 30 seconds go she saw this boy with a shattered arm and legs and he looked almost fully healed. His bones were straightened out at least and were only now starting to fuse back together. She got that part cuz the boy started crying out in pain as so many of her previous patients had cried out. Only she wasn't the one doing the healing. The boy had an orange glow around him and something that looked like a tail shove in his mouth to bite on.

Over the course of the next minute the boy was back up on his feet a little woozy but entirely healed.

"Young man what kind of quirk do you have that you are so fast and strong but you can also heal yourself so quickly."

"Ummmmmmmmmmmmmm"

"I miss recovery girl am his quirk. My name is kurama the Demon Fox. I was only just able to awaken myself from the young midoriya here because his body had become able to handle a fraction of my power. I am essentially living energy that has complete access to his entire nervous system. I can coat him in my energy like armor and enhance his muscles to outrageous levels as well as heal any injury fairly quickly."

"Ahh i see a very powerful quirk indeed mister midoriya."

The test had ended and despite the slight throbbing in his bones midoriya managed to make his way home where he was stopped by bakugou.

"HOW THE HELL DID YOU GET A QUIRK"

"I always had the quirk. It was just way too powerful for my body so it remained dormant until I was physically fit enough to handle some of the power. I had no idea I had a quirk until this morning. When he appeared out of my body and started speaking."

Bakugou was dumbfounded. His entire world was on his head. Weak worthless deku has a quirk so strong it sealed itself off until he was 15 it made no sense.

Bakugou left midoriya without another word. His face had a mix of emotions: jealousy , outrage, regret?

Midoriya went into his apartment and gave an explanation of what had happened and Inko was so happy her son had a quirk and one that seemed powerful. Powerful enough for her little boy to be a hero.

Midoriya waited for a few days waiting for any word.

All might had been silent and I hadn't sent him anything yet until a holographic message in a letter.

YOUNG MIDORIYA sorry about ghosting you there but there were some fine print that needed to be done. BECAUSE I AM THE NEWEST TEACHER AT UA. and you young midoriya have set a record for most points in UA history in this exam. Not only did you get 40 points but because of a hidden point system you got 60 rescue points for the act of heroism you did while saving Miss Uraraka.

So welcome izuku to your hero academia.

Ps please come meet me at the same place right now.

Midoriya blasted out of his room and hugged his mother screaming I GOT IN I GOT IN. Then he took off towards the beach.

Upon arriving at the beach the 3 of them came up with a plan to make everything as believable as possible and ended up going with the on the nose plan kurama came up with and gave to the recovery girl.

Kurama then went into detail of how he became a part of one for all.

It all started with my original owner, a young woman who had just graduated school with a healing fox quirk when it was stolen by all for one and placed into the first wielder. You see the younger brother was lonely after being trapped for so long and after being forcibly being given the power accumulation quirk that merged into one for all. The younger brother tried to kill himself. And all for one couldn't have that happening so he stole me and forced me into the younger brother because if he was responsible for more than one life the older brother thought the younger brother would submit more easily. Unfortunately i wanted to be parted from the world as well because i missed my original owner. So i was going to help the first user to commit suicide and we were about to hang ourselves when the resistance broke in and not much longer i was passed on to the 2nd user and unfortunately i wanst able to manifest. And the story of the previous users goes on as if i weren't even there until you midoriya .

"Another thing all might"

"Im not the only extra quirk izuku is gonna get"

"What do you mean not the ONLY quirk"

"Yea kurama what do you mean"

"One for all has evolved enough to where i was awakened, it's only a matter of time before he gets the other 6 quirks from users past."

"6 more quirks" all might was dumbfounded.

"Not only that, but the remnants or a copy of their conshushes will be manifesting soon as well and some of them might not approved of his resolve"

"What do you mean by that fox"

"The 2nd and 3rd had to kill many people and were not what you would call heroes today. They will think he is wasting his time saving when he could be stopping all for one… because I can tell he isn't dead."