Disclaimer: All the characters and events that transpired from the To Aru series are all credited to the original author, Kamachi Kazuma.

Chapter 1: The Truth

"That ape! This is not a jungle you know?!"

Shirai Kuroko search over the entire room to find the boy, Kamijou Touma, who showed up at the Tokiwadai dorm, but soon gave up when she can't find him and sighed.

"...In the end, I didn't ask about onee-sama."

She sat down at her onee-sama's, Misaka Mikoto's, bed beside the human-sized stuff bear and hanged her head.

It's been several days when her onee-sama didn't come home and would try to hide her absences from their dorm manager. She thought that everything was back to normal, seeing Mikoto's relaxed, beautiful smile. Yet, once again, she was late in coming home. Kuroko wanted to investigate what was happening with Mikoto but hesitated, as she has already decided to wait for her onee-sama's to come to her for help.

Not knowing what to do, she just lay down at Mikoto's bed for a few minutes before the dorm's intercom rang, telling them that they have a visitor. When Kuroko answered, questioning herself who could possibly be visiting at this time, she was surprised to see the boy that she met with her onee-sama.

She was further surprised that this Kamijou wants to meet with Mikoto.

'Why does he want to meet with onee-sama? Does he know something about what she was up to?'

Finally able to find a clue, Kuroko let Kamijou let in the dorm and they waited at her room. As she was in the middle of their talk, she heard footsteps coming from the hallway and paled as she realized that it was her dorm manager.

In panicked, she walked towards him and grabbed his hand and tried to teleport him outside the dorm. To Kuroko's shock, she can't use her ability. With no other alternatives, she grabbed him again and hid him under Mikoto's bed.

After she hid him, Kuroko opened the door after she heard a knock and saw her dorm manager outside the room. She tried to lead her away from him by lying that other rooms are noisy and that she wanted to investigate.

She succeeded in doing so and after checking the other rooms, Kuroko returned to her room only to find no one inside with an open window.

'I have found my only lead, and now he is gone.'

She sighed again and brought her head up and look at her bed where that boy sat.

Whether she missed it or not when she was searching for the boy, she saw a stack of paper on top of her bed.

Curious, she stood up and pick up the stack of paper and read it.

"Utilization of the Sisters, the mass-produced Adepts dubbed as Radio Noise: A Method for the Level Five Superpower Accelerator to evolve to the Level 6 Absolute?"

Kuroko heard of Accelerator before. He was one of strongest Level 5 Esper in Academy City and held the top rank among the other Level 5s. Rumors stated that even when comparing with the second rank, his power is way over the top even though they are only a rank difference.

Kuroko questioned why this file was here in this dorm. She first thought that it was the boy that might have stolen it through hacking, but quickly scrapped it when she saw the stuffed bear with its head open along the attached zipper.

'The ape doesn't look like he has the skills to hack through Academy City's defense security. And seeing the stuffed bear, he must have got these papers inside of it. That means the one who got these files and hid it inside the doll was...'

Kuroko, ecstatic of finally able to learn what her onee-sama is up to, began to read the file.

What she found out is that this file is a report about a possible way for Accelerator to become Level 6. It stated that it is possible for Accelerator to reach Level 6 by letting him kill the Railgun 128 times in 128 different battlefields as provided by Academy City's greatest supercomputer, The Tree Diagram. However, as it was impossible to prepare 128 of the same Railguns, they recalculated using The Tree Diagram with the focus of using the mass-produced clones: The Sisters as an alternative. It was discovered that doing so by preparing twenty thousand battlefields and killing twenty thousand of The Sisters, they can achieve the same results on Accelerator reaching Level 6.

The deeper she read the file, the paler her face become, horrified of the truth being revealed to her.

"I-Is this the reason why onee-sama..."

She sat down the bed as she felt her legs getting weak and tried to digest the information that she read on the files.

'Come to think of it, the day when onee-sama started to act strange was when Saten-san told us that she saw her look-alike and Uiharu-san telling us a rumor about a laboratory trying to mass-produced a Level 5 esper through cloning. It was the day after when onee-sama didn't return home that night. To think that those rumors were true.'

She flipped through a few pages and saw a map. It was pretty detailed and saw X marks that were drawn in a few places.

'Wait a second. Aren't these the places where the arsons had happened a couple of days ago?'

Kuroko grabs her phone and tried to find the list of the places where the arsons had happened and a map in her email that was given to her by her colleague in Judgement and did a cross-reference to the map on her hand.

After some time, she was done cross-referencing it and both of them were identical. The ones that were crossed by Mikoto was the same place where the arson took place on her phone's map.

With this much information shown to her, Kuroko now knows what her onee-sama was doing several days ago.

'So all this time, onee-sama was trying to stop these experiments from continuing.'

Kuroko noticed the two codes that were at the upper left corner of the paper a while ago. One was that the terminal rank was C and the data rank was A. This was a total violation of the rule since a Rank A terminal was needed in order to obtain a Rank A data if Mikoto has done it in the proper routes. Seeing that she didn't means that she hacked through the system, suggesting that she was not a collaborator.

This also answered why the boy Kamijou wanted to meet Mikoto. Kuroko thought that he must have met with one of the Sisters and got involved in the experiment. Whether it was by accident or not, he saw the experiment and he wanted answers. And of course, the only person that can answer his questions was her onee-sama.

Considering the fact that he left the dorm a while ago, Kuroko was sure that he had read this file and ran off to find Mikoto. Probably as of this moment, he may have already found her.

"I have to find her."

Kuroko placed down the file beside her and stood up from her bed with determination and teleported outside the dorm.

And it is done! This is the first fanfic that I have created so please leave a review.

Thank you for reading and till next time.