The yellow flash of jujutsu high

Time skip.

In the middle of a forest, a blond boy man with piercing blue eyes could be seen standing there, his eyes were open.

He seemed like he was thinking of something.

He pondered on it for a while, he was thinking of what barriers he wanted to use.

Using his brain at its maximum capability, he used barriers, a bunch of empty barriers that he could rewrite and put whatever he wanted in there.

A way to explain it would be, empty barriers were like empty lines of codes waiting to get filled with info and start doing whatever you have programmed them to do.

As the barrier shimmered into existence, it started enclosing the area around him. Inside the space created by the barrier, reality bent to his will.

He wondered why most sorcerers did not use barriers more, they were just so fun to mess around with.

He was planning on messing around with them more until he found the recipe for the barrierless domain that he wanted to achieve.

If he achieved it, he would win any fight against Satoru if the decisive factor was a domain clash.

It never hurts to have more than one advantage over your opponent.

In order to better come up with a counter for the Satoru technique, Keitaro decided to train with the clone.

Keitaro summoned a clone of Satoru Gojo.

The clone wasn't real in the traditional sense, if the barrier were to get shattered the clone would vanish.

The clone could only exist within the domain, the clone was one line of code that only worked within the domain, anywhere else and the clone couldn't exist.

The clone had all of Gojo had most of the info Keitaro had about Satoru installed into its brain.

The information about the six eyes limitless sorcerer flowed in the clone's brain.

Another thing Keitaro had to tweak was the clone battle iq, after putting all of Satoru's good battle iq plays in the clone's mind, this should help the clone better understand stuff.

Something else Keitaro had to fix was the clone's six eyes. Keitaro couldn't have a clone walking around with a bootleg six eyes, and thus he decided to max the clone's perception.

He gave the clone ultra-red vision, X-ray, and even the ability to feel the distortion of space within the domain.

He didnt care if the clone's perception was above Satoru's, that would be a good thing for Keitaro as if the clone he created of Satoru had better perception than Satoru, and Keitaro could perception blitz that clone that meant he could do the same to the second strongest sorcerer of the modern age.

Speaking of which.

Keitaro pulled out his phone.

{Fastest sorcerer}

"Change your username"

{Stronguest sorcerer}

"Heh, why"

{Fastest sorcerer}

"You lost our last fight, that title does not apply anymore"

{Stronguest sorcerer}

"😒"

{Fastest sorcerer}

"Do it"

{Second strongest sorcerer}

"I ask for a rematch"

{Fastest and strongest sorcerer}

"Well buddy you will have to wait for a few months, so until then....take the L....savor it, it's going to be a familiar feeling for you"

Keitaro placed his phone away after being petty enough for the day.

He remembered that the clone damage wouldn't be permanent, all the damage would be virtual and none of it would actually hurt him.

It was like wearing a VR headset and the headset working like the one and Sao.

Without the dying part of course.

Anyway, he decided to just start inputting all the info he had on Satoru on the clone, using all the info he had gained from their last fight in order to make the clone as accurate as one man possibly could.

However he wanted more, he craved more, decided to play with fire he decided to make the cost about 20% greater than what he had faced previously for no other reason than he just wanted to push himself to his utter limit

"Alright," he said to himself, loosening his shoulders, "let's push it to the limit."

He was ready to push himself to his absolute limit and see if that seal worked.

He started stretching a bit as he gazed at the clone, he was ready for this.

Time skip.

About 300 spars later, Keitaro was running out of curse energy, the clone was strong alright, just as strong as he wanted it to be.

Anything he found himself getting too cozy with the clone he would upgrade the clone's stats once again.

He wanted to push himself to the brink with every single spar.

He wanted nothing more than just to improve himself to his absolute limits.

Though as he layed down on the floor, he did wonder what his friend was doing.

Pov change.

"No...Keitaro is faster than that" Satoru grumbled as he wiped some blood from his face.

He looked at the clone of Keitaro he had made in his domain.

The clone had shattered his domain in about 3 minutes...that was too slow, Keitaro would have done it in 2 minutes and 50 seconds.

Gojo had taken the liberty to buff the Keitaro clone.

He gazed at the clone that was looking at him and the beast stared back at Satoru.

Covered in shadow and with eyes as red as blood.

He would not lose again...he needed more....more...