12 First ever human transmutation

Thus the battle training was completed and as the students were walking back to the class with All Might, Ichigo was observing All Might because he remembered from the anime that despite looking all normal, All Might's time with One for All was reducing and drastically causing his facade to also start crumbling.

Ichigo could see the faint trembling while he was walking. When they got closer to the exit of the ground it looked like he was nearing his limit. He immediately stopped and turned around to face the class and said,

"Good work Everyone!"

"We didn't have any major injuries and everyone performed nicely. However, you still took this on seriously! You all did a very good job for your first time training!"

"To have such a proper class after Aizawa-sensei's class is kind of anti-climatic." Commented Tsuyu.

"We are free to have proper classes, as well!" All Might retorted,

"Well then, I just remembered that I have some work to do so you guys can change and return to the classroom!"

As he was speaking, All Might already started to turn around and ran out quickly as soon as he finished speaking.

"All Might is so amazing!" Kaminari shouted in admiration.

"I wonder why he is in such a hurry?" Commented Ojiro and immediately Izuku's face turned into a worried look before he hid it.

*Recovery Girl's Office*

As All Might walked into the small office of the small and old lady, he saw that she had a contemplative expression. She didn't have any work in front of her but he noticed that she had the same expression she had when she was wondering how to save his sensei after her final fight with AFO.

Although her plan was a failure, he never blamed her for it anymore since he knew that the damage she received was even worse than what he currently had. He was still disappointed in his younger self for being angry at Recovery Girl, even if it was in a brief fit of emotions.

"Ah Toshinori, you're here. How are you?"

"Hello Chiyo-san, I am doing alright but my time is getting shorter. Is something wrong?"

"Well no, it's the opposite. We might have something that can help you…"

*Class 1-A*

After we changed and came back to the class, Aizawa-sensei came up with a recording of the battle trials and immediately started to criticise their fighting styles and issues they faced when they were fighting or about what they should have done instead in different situations.

This was followed by a period of laws and politics for heroes where they learned about stuff like what are the restrictions on heroes? What was illegal for heroes to do? What was not? Almost in

In the middle of the class, he stopped the class because someone came in and gave Aizawa-sensei a slip. After reading it, he called out,

"Kurosaki Ichigo, you are needed at Recovery Girl's office after-school. It seems whatever you are going to do there will take time, so you are requested to tell your guardians about it before you go to her."

As soon as Aizawa-sensei said that he was needed at Recovery Girl's office, he understood that she gave him the green light to use Alchemical healing on All Might. The next sentence did nothing but cement the suspicion.

"Yes, Aizawa-sensei"

But that message had disturbed Ichigo's concentration on the class as he took out his notebook with alchemical notes and started going through all of his circles, formulas, theories and information he got from Recovery Girl on All Might's condition. He wasn't worried about missing out in his classes because his mental avatars always recorded everything in his life.

One might wonder how that could be possible if the brain has limited memory. Ichigo got around it by grading memories but their importance and the less important ones were saved with less clarity after they were graded.

After class, during one of the 10-minute breaks, Momo walked forward up to Ichigo who sat in front of her and was looking at many papers spread around with various mathematical calculations, chemical reactions and alchemical arrays.

"So what are you going to do with Recovery Girl? Ever since you got the message, you have been awfully distracted, have you not?"

"I am working on the healing application of my alchemy and I'm going to perform my first major surgery today."

"Wait, don't you need to have a doctor's licence for that?"

"Oh, that? I got it almost 8 years ago."

"Wouldn't you have been 7?!"

This revelation immediately got a look of astonishment on Momo's face as she was looking at Ichigo like he was an alien or unbelievable. Seeing her expression, Ichigo couldn't help but mess with her a little,

"Why are you looking at me like that? Isn't that normal?" Ichigo said while acting cluelessly.

It was then that he heard a snicker from his side and he saw that it was Shinso who overheard him from his table. However, Momo didn't notice him.

"Seriously, you are kidding me right?" Momo asked with disbelief covering her face.

"Wait, you didn't get 3 PhDs as a birthday gift when you were 10? Weird." He said that seeing the dumbfounded and shocked expression on Momo, Ichigo was struggling to maintain his mental shields and his facade from failing due to almost bursting out in laughter. But seeing that she was losing it he decided it was enough.

"Nah, I am just messing with you," Ichigo said, causing Momo to drop her shoulders in relief that a 10-year-old didn't have more qualifications than her. And Ichigo had to break one last joke after seeing that,

"I only got 2 Phds on my 10th birthday, the third one came 3 months after that."

He then paused for a second before chuckling, "And I know that I am kinda freakishly intelligent."

She gave him a reproachful look and said, "So, you are going to do your first surgery huh? Then don't you have to be calm and collected, for using a surgical knife?"

"I don't actually need surgical tools in my process, as I don't need to open the body."

"Then it is got to be much easier right?"

"It is much easier for the patient, but it is a lot more dangerous for the surgeon."

She gave Ichigo a confused look and said, "I don't get it?"

"Sigh, Let me give you a quick, basic rundown. There is only one solid rule in the entirety of alchemy that I have found."

By this time more students started to listen to the conversation.

"It is the science of understanding the structure of matter, breaking it down, then reconstructing it as something else. But alchemy is a science, so it must follow the natural laws: To create, something of equal value must be lost. This is the principle of Equivalent Exchange.

So I must be careful in any form of transmutation that involves flesh, cause one small mistake and it might be my flesh that is being exchanged."

When they heard that part Ichigo saw their face's turn pale as they probably tried to imagine the flesh being taken away."

"That is so scary, but it's also very Manly!" Commented Kirishima out of nowhere.

"Honestly, I think that is the scariest but also the most useful ability I have heard of. Ribbit." Asui said from the other side of the room.

"And that is why I was triple checking all the arrays, circles and my calculations."

Momo was about to say something but before she could, break time was over and the next teacher came in.

After school, as everyone was packing their bags, Momo walked up to Ichigo and said, "Best of luck on your first surgery and don't forget to be careful."

Some other students who heard the previous conversation also came and started encouraging him.

"Thanks, guys, It means a lot to me," Ichigo shouted as he went away. But he then stopped and turned to Shinso and said,

"Oi Shinso, I am going to be late so why don't you sleep in the car, hang around an arcade or something like that?"

"Okay," Shinso replied with a tired nod. Ichigo couldn't understand the guy. He was normal in the orphanage but after coming to UA, it was like the tired personality which was shown in the anime was showing up.

'I wonder if it was because of the regular usage of his quirk. I should talk with him about it later.'

*Recovery Girl's office*

Ichigo walked into the room and greeted the four occupants within it. Recovery Girl, a weakened All Might, his homeroom teacher Aizawa and the headmaster Nezu.

"Am I a bear, Am I a mouse who knows? I am Nezu, the principal of U.A. Nice to meet you Kurosaki-kun!

Aizawa and I will be watching just in case something goes wrong and Aizawa needs to suddenly stop your quirk." Nezu explained while barely reaching the table that was in front of the chair that he was sitting on.

"It is alright, headmaster and nice meeting you too. Where are we going to do this though?"

"In an emergency surgery room that we have prepared"

As they walked out, Ichigo noticed Recovery Girl looking more worried than all of them but he didn't say anything cause he was still using most of his mental capabilities to go through possible simulations of what could occur.

When they arrived, he took a vial of blood from Recovery Girl. It was filled with All Might's blood which was pretty easy to collect with all the times he coughed it out.

"All Might, please remove all your top clothing and lie down on the surgical table."

As All Might laid down on the table, Ichigo took some of All Might's blood with a transmuted paintbrush and then proceeded to draw a collection of small Magnum Opus symbols connected to create a circle.

As he was doing so, Recovery Girl was remembering her conversation with All Might.

//Flashback//

"Well no, it's the opposite. We might have something that can help you…"

"Help me about what recovery girl?"

"Your injury, Toshinori, we may be able to restore you to normal, but I don't want to get your hopes up. This is an experimental procedure and you may be the first human trial. It showed great effects when used on animals, but while I think it is risky and that you shouldn't take it, ultimately the decision is yours"

"First human test subject? Why would they come to me then? Nobody knows my injuries and those who know don't have a healing quirk expect you."

"It is actually from those who know about it. It is from your student in class 1-A."

"What! Wait! Does Midoriya-shounen have a healing-type quirk? I thought he was quirkless?"

"Not him you knucklehead! Don't jump to conclusions blindly! I am talking about Ichigo Kurosaki. The day you first brought your successor here for healing he saw my healing and after an explanation of how my quirk worked, he was inspired and went home and started experimenting on a way to do the same with his quirk.

It seems that he found it. It is mostly similar to mine, except that it is even better in the sense that he doesn't need the body to do the work, leaving more stamina for the procedure. It can also thus remake organs and cells which the body naturally cannot heal.

But all of this comes at a greater risk to the healer due to the nature of his quirk. In my opinion, I would suggest you to not have this surgery due to the uncertainty, however, ultimately it is your choice."

"Oh, so it is Ichigo-shounen then. Hmm, if it is Ichigo-shounen then I will take this chance! If I heal completely, my final embers would last much longer and it would put less pressure on the heroes of the new."

"But, why? Why take this risk and put faith in a child who isn't even your successor? Because even geniuses make mistakes, what is to say he didn't make a mistake this time? We already made this mistake with Nana."

"Because from all the time I have observed Ichigo-shounen and if it is anything serious, he doesn't do anything half-heartedly and he has my complete trust! Plus, even sensei would have made the same choice even if she knew the result, she would have hope regardless of how small it was."

"Sigh, whatever, I can never understand yours and Nana's blind trust in the people. I will send someone to send a message to their classroom saying that he should stay after school. But I am going to invite Nezu and Aizawa to watch it and stop it in case of an emergency."

"Yes, that would be ok with me too, Recovery Girl."

// Flashback End//

As Ichigo finally finished drawing the circle and arrays, he turned around and gave Recovery Girl a letter, "Ok, I am finished with my preparations. By the way, take this."

"It has my will. If something happens to me today, I want three copies made. Each was given to Sister Lily, Shinso, and my butler Asato-nii. The primary executor of my will is going to be Asato-nii, but in case of complications it will be transferred to Sister Lily."

"Why are you doing this Kurosaki? Why are you taking such a risk to heal a stranger putting your life at risk?" Aizawa asked.

"Sigh, I believe that stagnation is equal to death. If I do not progress today, it might as well be a death sentence to my growth."

There was a silence followed by Ichigo's words, "Anyway, I am going to start now. Please try not to disturb me during the process as it requires a high amount of concentration.

Anyway, I have decided that this is going to be a two-step operation, it was decided like this to minimize risk as well as allow recovery time for the patient to gain back the stamina. But if there are any complications or changes in the circumstance I may do it in a single step."

Seeing that everyone was far away and the preparations were complete and that All Might was under anaesthesia. Ichigo placed his hands on the blood drawn transmutation circle and started the transmutation.

As soon as the alchemy started, constant sparks of alchemical electricity started to whiz around the circle. Ichigo decided that he would do the easier parts first and targeted the lungs and the surrounding tissue and muscles.

As the alchemical process continued, All Might's body started to disassemble and reassemble into thin microscopic sheets like origami. As soon as the lung was completely healed, he started to work on the remaining surroundings like muscles and tendons. All Might's depleting stamina then suddenly drastically increased.

Ichigo was shocked and confused as to what was the cause of the sudden increase in stamina but he immediately understood that it was due to him being able to breathe freely that the amount of oxygen required for energy increased.

It was humbling to Ichigo to see the absolute behemoth of energy which was released just because of being able to breathe properly. But recognizing the opportunity given, Ichigo made the on-the-spot decision to continue the process and heal the remaining injuries.

He immediately disassembled the direct connection from the oesophagus to the small intestine while at the same time reconstructing the stomach, reconnecting the oesophagus to the stomach and connecting the newly formed stomach to the small intestine.

As the final process was completed Ichigo stopped the transmutation and fell back into a chair nearby sweating and panting. Since it was his first human transmutation, a low level maybe, but one nonetheless, he decided to forgo any limits and completely stopped all his mental avatar except one to record the memory.

He had forgotten to take into account the energy consumption of the alchemist during the entire process as he hadn't noticed any strain on his energy during the transmutation of the animals. But human transmutation itself takes 5 times more energy than animal transmutation. As he looked at his surroundings he could see that a lot of matter had been removed as it had a medium size crater which was transmuted into the body mass.

But this was caused by the lack of information about the subject itself. With all the horrible accidents happening to those who performed the taboo nobody had probably noticed it. But anyway the operation was a success.

"Hey, the operation was a success. You guys can come in now!"

��Wonderful work, Kurosaki-kun, it was a marvellous display of your quirk! Now, how much time will it take to start the second stage?" Nezu asked as examined All Might.

"There is no need for a second surgery. When I finished healing his lung immediately, his stamina shot through the roof with more than enough to spare for the stomach part as well, so I made a split-second decision and completed the operation."

"You mean you completely healed him in one session?" asked Aizawa.

"Amazing! looks like it works. His scans here show that everything is back to normal, well… as normal as they can be. His body probably won't go back to normal anytime soon. But all his organs are healed and he will make a full recovery. Though that doesn't stop him from slowly losing power, it greatly slows it down." Commented Recovery girl who went directly to the monitors.

"Ah, yes, although I fixed his body, I would recommend you to use quirk to speed his healing to see if there is any organ rejection please."

"Hmm, that is a good idea. Let me do it, Chyuu~"

All Might was covered with a brief green glow.

"Hmm, looks like there is no organ rejection."

As soon as he heard those words he fist-pumped in the air. He created a new branch of alchemy completely on his own and he wasn't even in the Fullmetal alchemy world.

"That is good, I would suggest keeping him on a diet for a starving patient as probably his digestive system can't handle the stress because I made the organs close to the condition of the other organs to decrease chances of a rejection reaction.

He should probably do any intense exercises like his hero duties for at least 3 months. But you probably know that recovery girl. Now, I am extremely tired so I am going to go home and rest now. Tell All Might I wish him a speedy recovery. Bye."

"Just a sec, I am sorry for not believing in your capabilities." said recovery girl sincerely.

"Yes, we are very proud of you Ichigo-kun," Nezu said to which Aizawa nodded.

"Woah, Woah, no problem, it is the behaviour of any professional who hears the impossible to be suspicious about it. I honestly expected your reaction. But I didn't expect All Might to accept the invitation so soon. Anyway, I gotta go. My brother is waiting so bye."

Ichigo said as he walked out he took his will, which was on a table, and quickly transmuted it into a get well soon pop-up card and put it on All Might's bedside.

"He is an amazing young man with amazing abilities," Nezu commented.

"That he is. I hope he stays on the good side because it would be a pain in the butt if we ever have to fight him" Aizawa said.