Sukuna Pov

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'Man... I'm getting my ass beat.'

Sukuna was lying on the ground. He received a beating from Mirko because he wanted to train himself.

"Oi kid, get up. When I say break, we can have a break."

...

2 hours earlier (after the simulation fight)

"Nice one, kid! You beat a villain that even pros couldn't handle. Your quirk is very powerful, and your quirk nullification is amazing as well."

"But don't get too arrogant. Just because a quirk is powerful doesn't mean you are invincible. You're nowhere near as strong as me."

"Oh really, I can take you on without breaking a sweat."

"We'll see. Now, quit chatting, I wanna see your skills."

Mirko was ready

"Heheh, this is gonna be a piece of cake."

Sukuna got ready

"And...start!"

...

Present time

Sukuna got up and brushed the dust of himself.

'Her quirk is literally a rabbit. Big ears, super speed, and strength. She's obviously very athletic.Plus, she enjoys the thrill of battle. I used to see those eyes everywhere. When sorcerers travelled far away just to die.'

She dashed right in front of sukuna and kicked him upwards to the ceiling while doing the split.

.*Boom*

'Oww, man, she's fast barely blocked it, and my hands are shaking.'

"heheh,"

Mirko Pov

'Hm? He's laughing?'

"Hey kid, I know your stuck on the ceiling but get down from there."

Then the ceiling let up and Sukuna limped body started falling head first.

"Cmon, if your already unconscious then why did you want to join me."

Mirko jumped up with the intent to kick him away.

And when she did, Sukuna grabbed her leg

'Shit, he caught me.'

With the remaining strength he has, he uses it to swing Mirko to the ground while gathering cursed energy on his fist.

.*Boom*

"I'm not finished."

Sukuna slammed his fist right onto mirko.

.*Boom!*

"Hahah*inhales*Hahahahahahah!"

"Powerful attacks like that won't stop me."

Mirko grabbed Sukuna with her legs and used her weight to swing Sukuna to the ground by doing a back handspring.

'This kid has potential. he just needs to be stronger.'

"Dismantle"

Mirko instincts told her to jump away and avoided the dismantle.

Sukuna got up and saw her dodge his attack.

Beep*..*beep*

"Break!"

"*Breathes heavily*..Did you sense my Dismantle."

Mirko walked to him and pulled him up.

"Yeah...my body just tells me avoid something. I really can't see those slashes. Unless if your able to know when and where there coming from its almost impossible to dodge it."

"Well, that's my quirk for ya."

"That's one of your quirk. I saw your attacks during the festival. And...Well they are deadly. What was that Shrine that has those teeth?"

"My malevolent shrine is an attack that slashes everything in a 200 meter radius, I can adjust it to how small I need it to be."

"Hah, wow! so your malevolent shrine can basically wipe everything, and it's impossible to dodge it."

"Pretty much, yeah."

"Well, that's enough about you. Let's grab something to eat. My treat."

"Sure."

"Oh, we should probably lick our wounds or something. A nurse should be ar-"

"No need."

He healed his wounds and Mirko's wounds as well.

"Hah! How could I forget! you can heal and heal others. When I saw your charred body heal in an instant, it left me to question, what is your full potential? could you even possibly even rival All Might himself?"

'Man, she can talk a lot.'

"Since your internship has a few more days left, you can train with me. Is your home in Hiroshima?"

"No, in Musutafu."

"Well, I guess you don't have a choice, you're staying in a hotel."

"Already booked one, and the building is literally right next to it."

...

The next day

'Damn! hero killer: Stain was captured, and that warp guy and decay guy escaped. Apparently, nomu's appeared in the area. I really hope this training is worth it.'

When he entered the simulation, he saw mirko standing there at the centre of it.

"Wake up sleeping beauty, today you're going to learn parkour."

"Wait...what!"

"Your quirk is powerful, really it is. But from the last fight, you have a limit. Your energy can make your body stronger, but your capacity is low. If a durable opponent can survive your slashes, you're done."

"Sure, but what if the opponents quirk is making them stronger. I can nullify it."

"Yes, you can, but you have a limit. First, if your opponents quirk is more powerful, your nullification can only lessen the effectiveness. Second, touching your opponent will stop the opponent from using their quirk, which would probably cause a lot of problems. And third, is just a theory, but I'm trying to see if it works or not."

Unfortunately for Mirko, Sukuna was lost in her explanation.

"I see... I don't get it."

"Okay, let's take one of your friends, for example...Uraraka!"

"Nullification will work if you touch her or her

quirk, for example, if you touch a rock that is floating. The rock will immediately fall down."

"Okay.."

"But if you punched her with Nullification. Then, all her rocks that she is controlling will fall."

"I see."

"Another one...Cementoss! Nullification will make him unable to control the cement near the nullification zone. But if you were to punch him, he won't be able to use his quirk."

"What about the cement that he controlled?"

"If the cement is wet, then it will all fall. If it's dry, then the shape of the cement will remain the same if the structure is stable."

"Ohh.."

"Of course, it all depends if the quirk is weak or stronger."

"Then why do you want me to learn parkour?"

"To make you learn how to traverse the city without destroying it. You don't care about the infrastructure, and it will put people in harms way."

"Oh, come on! You fight villains like its a normal Tuesday for you. You must've at last destroyed other people's property and barely bat an eye at them."

"And the least I could do is decrease as much destruction I'm causing."

"...fine..."

After Sukuna begrudgingly accepted her training. The simulation started to change around them to a jungle a city and few more locations.

"We're doing the city."

"Now what moves are you going to teach me."

"Oh no. That's for you to learn"

'Why did I think that this would be easy?'

"Your objective...is to catch me! A time limit is set for 30 minutes and if you don't catch me within the 30 minutes the locations will change and you are forced to adapt to it. This is a challenge where you cannot lose but will almost never win. Got it."

"Got it."

"Oh, and you must capture me to win. make sure that I don't escape your grasp for 10 minutes. "

'A cat and mouse chase where the obstacles are against me, and I must hold the mouse and not let go for 10 minutes. '

"Okay... ready...set...Go!"

3 hours later

'I still haven't caught her.'

4 hours later

'Still haven't caught her.'

3 hours later

'I'm catching up to her but still haven't caught her.'

1 hour later

Sukuna successfully manoeuvred through trees, buildings, houses, caves, and other things.

'This will be the last course. I will fucking catch you, you stupid rabbit.'

He sends a two dismantle infront of her one for her to jump over and another to lose her balance. He dashed straight at her and finally caught her arm.

"This isn't over yet!"

'I just have to hold on and not let go. I don't have to immobilise her, just make sure I fucking hold on.'

Which is easier said then done. Mirko was like a raging bull slamming sukuna to ground while he is holding on for dear life.

10 minutes later

"Welp, now that's over. Short break."

"Man, that sucks."Sukuna complained.

"Some of the villains will sometimes avoid confrontation. They already know how deadly you are."

"Great, A flee on sight warning for me."

"That's why traversing obstacles is important. "

"Sure*crack*my neck sore damnit."

"Oh, quit your bitchin. We'll be going on patrol after the break."

...

after the patrol

...

"Hah! Nice one. Finding Nomus in the area was unexpected."

"They were very weak. The one that All Might fought at the USJ was much harder than these guys."

"They were probably incomplete versions, or they wanted to have a test drive. Anyway, we'll be going to a different district tomorrow."

"Where?"

"That's for me to know and you to ponder."

"ugh."

Mirko ruffled his hair.

"Really? I'm not a child you know."

"You literally are. And if you don't like it why aren't you stopping me."

"..."

"Let's get back to your hotel. We're gonna be very busy tomorrow."

"That depends."

"Sure, kid."

...

After the internship, Sukuna went back to UA and is curious what the others were doing during the internship

"Hahahah! Seriously?! Seriously, Bakugo?!" sero and Kirishima laughed.

"Stop laughing! My hair's gotten used to it so it won't go back even after I wash it!" Bakugo explained

"Pfft hahahah!" Sukuna started laughing at Bakugo's hair.

"I said stop laughing!"

'He got a make over. That wasn't what I was expecting. More importantly Deku, Iida and scarface apparently encountered Stain himself.'

"Oh yeah! the hero killer." said Sero.

"I'm glad you guys made it out alive! Seriously." said Kirishima.

"I heard Endeavor saved you, right?"Said Satou

"That's amazing! As expected from the No.2 Hero!"said Hagakure

"Deku, the hero killer quirk works by him drinking his targets blood and paralysing them, right?" asked Sukuna.

"Yes, did you see the video, Ryoumen-san?" Izuku asked.

"Yeah, it's a shame that I didn't get to see him in action."Sukuna sighed.

"Oh yeah, Ryoumen-San, who did you work for by the way during the internship?"

"I worked with the Rabbit Hero: Mirko."

"Wait, WHO?!" most of the entire class screamed.

"Mirko, the rabbit hero, why? is she that rare for people to work under her?"

"No! it's just that Mirko is a new type of hero who jumps around all of Japan instead of covering just one jurisdiction!"

"Yes, she showed me that."

"Also she doesn't have a sidekick so working up with her is a rare chance."

"Make sense, she fights better when she is alone. That's why my patrols with her are separated."

"And she's literally one of the top 10 her-"

Sukuna shushed him.

"Trust me, I know. "

...

Sukuna pov

We were all gathered at a different training ground with All Might as our instructor.

"Long time no see! boys and girls. How've you been? For this times hero basic training. Since you've all just gotten back from your internships, we'll have some fun with a rescue training race!"

'A...shit'

Iida raised his arm.

"If we are doing rescue training, then shouldn't we do it at USJ?"

"That place is for training for disasters, Do you remember what I said? That's right! I said "race""

"This is field gamma! A dense area filled with factories laid out like an intricate labyrinth. You'll break up into four groups with between six to five people and go thro6the training one group at a time. When I send out a distress signal from somewhere inside, you'll all start at once from the outskirts of the city!"

"it's a race to see who will rescue me first! Of course, you'll have to keep damage to buildings to a minimum. "

All Might points a finger at Bakugo

"Don't point at me!"

'...Thank you Mirko'

"All right, first group, get in place!"

The first group is Izuku, Ojiro, Iida, Mina and Sero.

Sukuna wanted to see how far the others have progressed.

"Okay, here we go!...Start!"

.*Beep*

Sero immediately gained the advantage by using his tape to manoeuvres through the obstacles.

'So terrain is not a problem for him.'

And out of nowhere, Midoriya took the lead.

"Wow, Midoriya?!"

"What's with those moves?!"

'Those are Bakugo's moves! Interesting. He might even be just as fast as me.'

Suddenly, Midoriya lost his footing because he landed on a pipe.

'Unstable footing. You should be mindful on where you jump.'