[Night, Outskirts of the city]
In the outskirts of the city two powerful silhouettes are staring at each other. One is a muscular blonde man wearing a costume of blue and red stripes with yellow boots, the other is a mild evil looking man with white hair and red eyes wearing a fine black suit.
Even normal persons could feel the tension in the air, there was no sound, the breezes were silent, their breathings were heavy but not overwhelming and they were looking at each other intensively, as if a single strike could decide the winner from the loser.
And it resumed. The buffed man known as the hero All Might charged at the other man known as the villain All for One.
"Detroit SMASH!" All Might aimed at All for One.
"Shock absorption, shock redirection" said All for One extending one arm upfront and the other one back.
*SMASH*
All Might's attack connected into All for One's hand and launched a shockwave to All Might with his other hand, sending All Might flying.
"New Hampshire SMASH!" All Might punches the air while in the air to propel himself backwards towards All for One and smashes his body into the him.
All for One uses the impulse to thrust even deeper his punch into All for One's face. All for One countered creating blades from his body and pierce All Might's left shoulder and pushed him away.
Even with regeneration quirks All for One can't take the luxury of receiving All Might's attacks, he had to stall the battle and then wait for an opening to kill All Might and steal One for All back.
"So where is your little sidekick All Might? I hope he is still alive; you see I would like his quirk to see the future so if…." Before he could finish, he heard.
"Nebraska SMASH!" thrusting and twisting his arm at high speeds All Might generates a Tornado with his strength.
All for One dodge but then he senses All Might besides him, he tries to protect but it's too late.
"Texas SMASH!" All Might delivers a punch with the intention to kill, smashing All for One's eye in the process.
"Don't you ever talk about my friend like that you will never put your hands on him ever again!!!" All Might yelled.
All for One continued to smile in a creepy manner 'almost there I need to give him a final push for him to break but I can't risk to talk about Tomura, he is for later' thought All for One seeing All Might losing his grip.
"Carolina SMASH!" All Might dashed forward with his arms in crossed position trying to smash All for One's head.
All for One starts to fly in the air and then a thousand of metal needles appear in the air taking aim to All Might. The needles rain upon All Might like heavy rain.
"Nebraska SMASH!" All Might again launches a tornado but this time is All for One who takes advantage of the situation by trapping All Might and a muddy substance with shock resistance.
Once immobile All for One charge a beam of red light and launches it towards All Might, who helplessly gets directly hit by said attack.
All Might is injured and breathes heavily until All for One went into offensive. All Might had almost not enough time to defend, he threw a punch but All for One dodge and punched All Might's chest.
Once All Might fell on the ground All for One said "Well it appears that you will meet your teacher soon All Might, now to get rid of that interesting quirk" All for One extended his hand towards the fallen All Might and pierced his skin with them.
"AGHHH!" All Might yelled while All for One was trying to steal One for All.
Once All for One was close in stealing One for All he saw his brother and then he was repelled from the mindscape and All Might's reach.
"So that's how it is brother, that is the back-up you installed when you died" All for One said getting up "even after death must you always stand in my way…Yoichi".
All Might got up and looked at All for One, he almost loses One for All and let the heroes' that sacrificed their lives before him be in vain. 'The next generation, I have to succeed today and give One for All to the next generation of heroes. All Might thought.
All Might dashed and grabbed All for One's left arm and said "Oklahoma SMASH!" All Might whirls around while grabbing onto All for One's arm and then starts spinning at high velocities and throws him away.
Before All for One could react, All Might was already in front of him charging up his fist.
"TEXAS SMASH!" All Might yelled at the top of his lungs and then strike All for One's face launching him to the ground.
All for One regeneration couldn't heal all that damage and was laying on the ground.
"Nana Shimura was an amazing user, she managed to entertain me even better than you" All for One said trying to rile up All Might.
"Get my teacher's name out of your filthy mouth"
"We know how this goes All Might, you won't kill me, you don't have the guts and that is because: Nana. Shimura. was. a. FAILURE." All for One grinned.
"I TOLD YOU TO SHUT UP!" All Might lunges at All for One.
"Damage reversal" All for One said as he touched part of All Might's lower chest and suddenly a big wound appears on him.
*SPLAT…COUGH...SPLAT…COUGHT...BLERGH*
It was as if All Might was throwing up most of his blood.
All Might took steps backwards and knelt while clutching his wound, he understood what happened, he lowers his guard and let All for One to use a quirk that inflicted damage to another being as much as he was damaged.
Seeing his deplorable condition All for One gloat "you see All Might, all I said was true Nana Shimura has died full of regrets for having you as her disciple and losing One for All".
'Teacher, I have failed you… no I have failed everyone, from the first user to Gran Torino-sensei, I have failed you all.' All Might was on the verge of crying but then he remembers.
'All Might, I'm counting on you'-Nana Shimura.
'that's right, I can't give up now of all times, even if my body breaks and my soul disappear, I have to keep on top, TO BECOME THE SYMBOL OF PEACE' All Might thought while putting all of his energy into his fist.
"Oh? Can you still move? All Might" All for One Asked. "If so then allow me to send you where your master is using the exact same attack".
All for one charge a powerful black red shockwave on his hands and points it to All Might.
With the las of his strength All Might sprints towards All for One.
"FAREWELL ALL MIGHT!" Yelled All for One before shooting his shockwave.
'Give it your all Toshinori!' thought All Might when he saw the shockwave getting closer.
"AAAAAAAHHHHHHH!!!" All Might yelled while using all the energy in his body to go through the shockwave.
The energy from the battle reached the city and it went into panic, Gran Torino tried to reach the scene but the shockwaves knocked him back.
All Might was holding with the rest of strength he had but was being pushed back. 'One for All, allow me to go beyond, if I lose everything that has been done will be lost and evil will reign once again, let me go beyond' All Might thought.
Suddenly he felt his arm in an intense pain and was covered in red cracks, All Might felt his arm becoming stronger and also felt an intense pain from it.
With a final thrust he went through the shock wave and reached All for One. "PLUS ULTRA DETROIT SMASH!!!" All Might yelled as his fist reached All for One's face, and started to beat him to a pulp over and over again until the entire floor shattered into hundreds, if not thousands of pieces.
After the battle All Might was exhausted, his injuries were worsening and his arm was so broken the injury reached the shoulder.
Gran Torino saw All Might's condition and a huge puddle of blood, believing it was All for One's he decided to take All Might and took him to the nearest secret hospital there was.
What neither of them expected was that All for One was still alive, he lost most part of his face and respiratory system but was still alive, he used a teleportation quirk and went to Doctor Kyudai Garaki to heal himself, the diagnosis was that he'll need at least 5 years to heal himself and even then, the injuries will never real heal.
(Meanwhile)
All Might was in a worse situation, most of his respiratory system and his stomach were gone, he had an excessive blood loss and his right arm will be broken for at least a few months. Gran Torino and Sir Night-eye were in shock after seeing All Might's current condition.
It would be revealed that All Might's wounds would make him able to do hero work for at least 3 to 5 hours a day, All Might was adamant about continuing to be the Symbol of Peace so to try and stop him Night-eye decided to tell him his future, Night-eye saw that if All Might continue as the Symbol of Peace he will die in 7 years, despite his friends warnings All Might continued and focused on healing and then continue minor hero work.
What Night-eye did not account for was that that his future sight can be overwritten, and there will be a group of young heroes that would fight All for One to put an end to his reign. All following a youngster with a mark on his face and holding a sword in each hand.
Creation is hard, cheer me up!
Feedback on fight scene i really need it to improve.
Next time on Reborn in My Hero Academia as a Demon Slayer: "Preparations for the future".
Let's see how will this unfold.