All for One came along with the other 4, he looked towards the dead Nomu's who were cut down. There was anger in his eyes as he had made this plan for the past few years to kill One for All's inheritance once and for all but some random kid disrupted it.
All for One - Tomura, who killed them?
Tomu- "pointing at Haruto" He is the one boss. His strength is very high. In under a minute he cut down all of them.
All For One – You are good kid. If you join us now, I can help you reach your full potential.
Haruto – Hmmmmmmmmm… No, you are too weak to show me my full potential. But don't worry after I kill all of you all, I will hunt down every last one of you.
All for One – jajajajaja, you are a funny kid. You think you can kill me. EVEN ALL MIGHT WAS ABLE TO DO NOTHING.
Before Haruto could answer, the roof of USJ tore apart and a figure came down and said, "FEAR NOT FOR I AM HERE"
...........
FLASHBACK
Before 5 minutes…
Hero 13- Now that there are a lot of villains and we don't know their exact strength we have to inform others. One of you will go back and inform the school staff. For this, I choose Tenya Iida.
Iida thought for a while but said full of determination, "I will inform them sir, but please be safe". After that, he left. (The villains didn't even try to stop them)
Hero 13 – Now, the remaining people make a group of 5 and help Aizawa and Haruto in fighting the villains. This will be a test for you as to how you fare when someone comes with the intent to kill. PLEASE BE SAFE.
Every other student nodded and went to fight. Momo, Toru and Mina were having it easy compared to others. Todoroki and Bakugo were also handling it easy compared to others.
From time to time Bakugo was shouting and laughing "DIE" "Die you bastard" "Die". Even the villains were confused about who was the real villains.
The students were fighting but also watching other fights to keep a notion of their surroundings. When everyone saw Haruto cutting down the Nomu's, they paled because this was the 1st time they saw someone getting killed in front of them.
Momo, Mina and Toru were also scared but they regained the calmness because they knew Haruto wouldn't kill for no reason. But others were not like that, they were scared, there were some whose legs even went limp.
Aizawa was also scared but said, "Don't be scared. Haruto killed those monsters who were created by experiments. If even one were left in a city, just imagine how much civilians would die. Killing is a bit extreme but sometimes it is necessary"
After that, they somehow managed to calm down and began fighting with the remaining villains seriously.
FLASHBACK ENDS
.........….
All for One – So, you have finally shown yourself All Might. Now prepare to die.
All Might – I will you return everything All for One.
Then like in the manga, they began fighting with each other and others were shocked as they saw All for One blocked All Might's full power punch barehanded. Everybody was confused about how can someone block All Might's power barehanded. They didn't have time to think as they were blown away.
Haruto – GET AWAY FROM HERE. IF YOU STAY HERE YOU WILL ONLY DISTRACT ALL MIGHT FROM USING HIS FULL POWER.
Then he looked at Aizawa and Hero 13 and said.
Haruto – Sensei please leave and protect the students. I will go and help All Might from the sidelines. And disturb others from ganging upon All Might. You go and inform the Top heroes to come here and help All Might to finish that guy.
Gigantomania – You are an awfully loud kid. Don't think that just because you killed this weak ass Nomu's you can defeat us.
Dabi – I will burn you to crisp.
Muscular – I will enjoy killing you.
Haruto looked at these villains who were laughing at him.
Haruto – You weakling will kill me. Let me see how powerful the dogs of All For One are.
After saying that Haruto decided to kill the weakling first then fighting with that huge ass Gigantomania. Haruto then rushed up to Muscular to send a diagonal strike to him but something blocked him. As his strike was blocked, Dabi then came from the sides and used his blue fire to burn him down. He almost got burned by that fire. As he dodged to the side, Kurogiri has teleport-ed Tomura there. Tomura used his decay quirk to decay Haruto's head but was met with a round kick that broke his ribs.
Haruto then moved back but Gigantomania followed him quickly and send a punch to which he sent a slash using his sword force realm power. Then Kurogiri teleport-ed Dabi behind him who sends a concentrated beam of blue fire. Haruto slanted his body at an unimaginable degree to dodge the attack.
Haruto ran away and made a distance between them. He knew that his lack of fighting experience is creating a problem.
After thinking, he decided to kill Kurogiri first because his ability to teleport is causing a problem, then Dabi, then Muscular, then that huge ass Gigantomania.
After deciding what to do, he rushed towards Muscular with the intent to kill him but as usual Gigantomania with his defense came and punched at his strike. (Though he is able to counter Haruto's strike, his blood is spilled because of how sharp Haruto's weapon is). But this strike was a feint and he dodged past Gigantomania using a movement technique. Then he struck at Muscular who thought he was going to die. But Haruto's target wasn't him, he wanted to kill Kurogiri first.
Kurogiri was using a wrap to send Muscular away, but just as he relaxed he saw that Haruto coming towards him with a cold glint in his eyes. He tried to teleport himself but Haruto's sword was quicker and decapitated him. Just as he killed Kurogiri, a punch came at him. He then quickly dodged to the side and maintained a distance between them.
Haruto – You want to kill me. But one of them is already down.
Gigantomania – I will FUCKING KILL YOU.. YOU BRAT.
Haruto just laughed and began fighting with them to gain experience. Now that he killed Kurogiri, the fight was going pretty well as there was no surprise attack from behind. He was fighting with 4 villains on equal ground. He then killed Tomura after a minute, followed by Dabi then Muscular.
Now he was fighting with Gigantomania who has a defense that can block Early Emperor Profound stage expert's strike and speed equal to a Late Sky Profound (Though his strength is only Mid Sky Profound). Both of them began fighting for more than 10 minutes now. Haruto was also watching the fight between All Might and All for One.
As Haruto's battle was going on. All Might be also fighting with everything he has but still All for One with his multiple quirks easily nullified them. All might's and Haruto's fight was very devastating. USJ was turned to ruins. Its roof was now gone. Many heroes and all the students from Class 1A began helping citizens to evacuate.
As the fight was going bigger and bigger other heroes started to appear. Endeavor, Best Jeanist, Hawks, Edgeshot, Kamui Woods also came to finish the remaining villains and fight with All for One. But the result was still the same. All for One used magnetism to start using other heroes as a human shield or beating them. After a few minutes, all the other heroes except All Might were defeated.
All Might was devastated and All for One also began telling him, that how Tomura Shigaraki is his teacher's grandson. All Might was mentally broken but still stand up to fight All For One. Haruto is also getting bored and increased his speed and started attacking his weak points like eyes, ears, neck, knees. In under a minute he managed to kill Gigantomania.
As soon as he finished him, he rushed towards All Might's fight to help the heroes who were injured. he quickly took them away. All for One wanted to attack him but he dodged it quickly and All Might also intercept him. (All Might is stronger than that is shown in anime or manga as the fight happening here is earlier than what should happen)
After Haruto took away the injured, not to a great distance but enough to avoid getting the impact. Haruto then rushed towards All for One and sent a powerful slash from a distance. All for One simply punched at it.
Haruto – All Might-san, you fight with him in close quarters and I will send powerful attack from behind whenever I get the chance.
All Might – Young Haruto. Be careful.
Haruto – I am careful but you also take care. You are the SYMBOL OF PEACE.
After than Haruto constantly sent powerful slashes at All for One. The fight began more intense but Haruto's eyes were shut and he was using En to locate and send slashes at All For One. (En- from HXH). He was using multitasking, one half was attacking All for One and the other half was understanding more and more about the sword.
And after a minute his aura changed, he stopped attacking. All Might also stopped to look at Haruto as he was okay or not but was sent away by a fist attack from All for One. Haruto has finally reached the sword heart realm in sword cultivation.
All for One quickly took the chance to kill Haruto, the annoying pest who was sending attack from the distance. He sent a powerful punch using 3 quirks. All Might shouted and tried to jump but it was too late. The punch was just in front of Haruto.
Haruto – So, you want to finish me off. FAT CHANCE. The match has just begun.
After that, he sent out a sword slash using his new sword heart realm power. The slash negated the punch. All might and All for one, both were shocked. All Might was happy that Haruto became powerful but All for one was angry.
After that, they changed their plan. Haruto was now in close-quarter fight and All Might was sending powerful long-range attacks to disrupt All for One. All Might didn't allow of this plan but Hauro insisted on it.
The gruesome fight began, All for one and All Might were seriously fighting as if their life depended on it but Haruto was actually enjoying as his comprehension was getting deeper and deeper with this fight.
After about a few minutes of battle, Haruto then sends quick slashed in succession at All for One's eyes neck, knees and every weak point as possible. He dodged a few of Haruto's attack but Haruto was like on steroids and just sent one after another his powerful slashes. Haruto now began injuring All for One. After another couple of minutes, All for one was covered with wounds from head to tail.
After the barrage of attack, there came a powerful punch of All Might which almost made All for One come to his knees. Haruto didn't give him any chance and use a very powerful strike that sent All For One's neck flying away…...