This is a prequel of this world. This actually happen one year before Yuji ate Sukuna finger on this world. Maybe I do a flashback on how that happen. Now with celebration of the first movie of Jujutsu Kaisen I give you all what happen one year before when Yuta Okkotsu had his problems. The Jujutsu world got notice of him quick but what about the hero world let's see.

One a random school in Tokyo.

The perimeter was closed. Police cars everywhere, parents coming to get their children and pro heroes doing analysis everywhere. On the center was detective Tsukauchi leading the investigation as his team was already inside doing some look out.

''So where is the scene of the crime?" Asked Tsukauchi

''Right here sir.'' Said one of the cat officers.

The detective and the cat officer went to a classroom that was put as the main scene of crime. When they get inside, they saw the thing that caused this huge problem, a locker and inside was 5 teenagers shoved into gruesome matter. It was unlike they would be normal ever again.

''Jesus. How did this happen?" Asked Tsukauchi in shock.

''I don't know people said that everything happen so fast that it was impossible to see.'' Said the cat officer.

''Who is the primary suspect?'' Asked Tsukauchi.

''Apparently is this kid, Yuta Okkotsu.'' Said the cat officer showing an tablet with a picture of the student and his backstory.

The detective took a great look at the file and for him that made no sense. That Yuta kid didn't seem like a crazy one or an evil one.

''What is his quirk?" Asked Tsukauchi.

''According to the teachers he is quirkless.'' Said the cat officer.

The detective was now confused as all hell with that piece of new.

''He is quirkless? How could he do this? It would be impossible for a non quirkless person do this.'' Said Tsukauchi.

''I know but he is the primary suspect. Until we disocver something else he is our target.'' Said the cat officer.

The two later went towards a girl that was on the classroom went it happen. She looked human looking and knew Yuta.

''So you knew Yuta Okkotsu?'' Asked Tsukauchi.

''Yes, he was always quiet and reserve. He never did anything wrong, but people liked to pick on him.'' Said the girl

''So why were these boys picking on him?" Asked the cat officer.

''I don't know maybe they just wanted to mess with him or scare him. You know.'' Said the girl.

''Typical high school stuff.'' Said the cat officer.

''So what happen next?'' Asked Tsukauchi.

''I don't know it all happen so fast that was impossible to see.'' Said the girl.

''What can you recall?" Asked Tsukauchi.

''He kept shouting ´´Rika stop!´´ over and over again.'' Said the girl.

''Rika? What is that?'' Asked the cat officer.

''I don't know. From what I heard was a childhood friend of his that died when he was a kid.'' Said the girl.

The girl response really gave the two detective a some kind of weird look.

''A deceased friend? Why would he shout that?'' Asked the cat officer

Tsukauchi felt there was something more there. He didn't know what but he didn't like it.

On Okkotsu apartment.

The teen lived alone on a regular apartment and the police was now going all over the place to find clues and other stuff that could help with the case.

''Nothing here.'' Said Tsukauchi annoyed.

''Detective look at this.'' Said another cat officer.

The detective went to see what they have found it. An old newspaper with a disturbing article.

´´Little girl is ran over by car. Girl named Rika Orimoto is ran over on a quiet afternoon, her friend Yuta Okkotsu is set to be traumatized by the event.´´

''So Rika is really his deceased childhood friend.'' Said Tsukauchi.

''Why would he shout her named in mid of class?" Asked the other cat office.

The two didn't know what was going on. Just that there was something that they were not sure or it make any sense.

Later

Tsukauchi and his partner were driving towards the central to make some other analysis of this case. While there the detective noticed something. He saw Yuta running away.

''stop the car!'' Said Tsukauchi.

The two then went by foot and they both saw Yuta looking at them, he looked scared and wanting to be alone.

''Its him! Its Okkotsu!'' Scream Tsukauchi.

The two agents then ran off as fast as they could to get the teen, but he was faster than expected.

''Okkotsu! Stop we have some questions!'' Scream Tsukauchi.

''Stay away from me!'' Scream Yuta

The teen soon saw that he ran towards a back-alley way with no exit. He was stuck and the two detectives where there with taser guns ready to knock him down.

''Please don't run. We just need to ask you a few questions.'' Said Tsukauchi.

''You don't understand! I didn't want to hurt anyone!'' Said Yuta all sad.

''We are going to help you. However, you are going to be taken in for questioning and answer for a few crimes.'' Said the other feline officer.

''No, please. Don't do this. Not with them they are cops.'' Said Yuta speaking weirdly for some reason.

''What are you saying?'' Asked Tsukauchi confused

''Please Rika, stop! I don't want you to kill them.'' Said Yuta now scared out his mind.

The two officers then saw a huge creature appearing out his back. It was like the ugliest thing they ever saw and was coming right toward them.

''What is...'' Said Tsukauchi in shock and then.

''I guess that is it.'' Said a new voice.

The two agents turn their heads and saw a young man, with black hair and white stripes all over his eyes.

''Who are…'' Said Tsukauchi drawing his taser gun.

Before he could finish his sentence, the mysterious man tap a finger on his forehead, and everything went black.

Tsukauchi soon waked up a few hours later. All dizzy and with no idea of what happened.

''Where am I?' Asked the detective.

The young man soon saw that his partner was also waking up but most important, Okkotsu had vanished.

''We lost them.'' Said the cat cop.

''Let's go to the central.'' Said Tsukauchi.

The two soon went to the central do some analysis and hopping to find any leads or some kind of connection towards this case. Little did they knew that was going to lead to nothing.

1 year later

Detective Tsukauchi was told to move on from the Okkotsu case and focus on other things. However, he felt guilty that he lost a young man like Okkotsu be lost and never to be found again in Japan.

''Sir we have new leads on the U.A case. That might lead us to whoever let the villains in.'' Said another agent cat.

''Thank you.'' Said Tsukauchi a little bumped.

Even with All Might help he wasn't able to find the teen. He felt he failed his job as a detective and let a young man like Yuta to be lost.

''Where are you Yuta?" Asked Tsukauchi all sad.

On Africa

Yuta was busy terminating some demonical looking curses with his teacher Miguel.

''Yuta try not to use too much strength. These are small fries, concentrate and use what is need it.'' Said Miguel

''Thanks Miguel.'' Said Yuta

The young man had changed a lot since one year. He went from a frantic and scared one to someone with more confidence and attitude. Now with Rika they are a good team ready to fight and defeat all kind of curses.

Ok this was a prequel. This happen on this world and before Yuji got sukuna. I wanted something small, nothing like Yuta dealing with Endeavor, All Might or other pro heroes. I don't think that a high school problem would be something that a pro hero would be focusing on. I almost though of doing a prequel where Yuta interact with Crawler, Knuckle Duster and Pixie Pop but I felt no. Akuta managed to give a great prequel and explore this world with just 4 chapters now that's impressive I need to say. Thank you all.