The Misaka Sisters incident takes place in the main story of A Certain Magical Index.
They are clones of Mikoto, the third-ranked Level 5 esper in Academy City.
Originally used for the "Mass-Produced Esper Project", they were later used for the "Absolute Power Evolution Project" experiment.
That is, they were meant to be experience points for Accelerator, the top-ranked Level 5 Esper in Academy City.
Of course, there is still a long time until this point in the main story, and right now, it's probably just getting started.
But seeing Mikoto now, head bowed in silence with a troubled and sad expression, it was clearly because she had discovered it ahead of time for some other reason.
After all, they were her own clones, essentially another version of herself.
Perhaps seeing another version of herself being continuously killed by Accelerator caused her pain.
Even knowing that, due to accelerated growth, their lifespans wouldn't be long...
"Go ahead, Mikoto. If I can help you, I'm willing to."
Seeing Mikoto hesitate to speak, Kaito gently encouraged her.
The others present chose to remain silent, allowing Mikoto to explain the situation.
"Kaito-nii... I am currently in Academy City..."
She spoke.
To help Kaito understand the background of their world and her situation, she began to describe things she had encountered when she was younger, as well as the matter of the clones.
The previous week, she had witnessed one of her clones being killed by a boy, and she eventually learned that the boy was Academy City's strongest student, Accelerator.
Mikoto had tried to stop the plan, but later learned that the initial "Mass-Produced Esper Project" had already been terminated.
What was currently underway was the "Absolute Power Evolution Project", which was secret and did not allow outside interference.
Therefore, even though the researchers valued Mikoto, due to the "higher-ups", they couldn't terminate it either.
Unless they were willing to risk their lives.
In other words, even if they had a change of heart and chose to terminate it, so what?
There were plenty of people to take over their work!
This was why Mikoto had been feeling so down lately.
"I see... I understand the situation."
"Don't worry, after this trip is over, I'll visit your world and help you resolve this issue!"
Mikoto looked up gratefully, but suddenly thought of something and shyly lowered her head again.
"Th-Thank you, Kaito-nii! If you help me, I'll use all my allowance to buy you the best Gekota I can find!"
"Gekota?"
"Hahaha!!!"
Hearing this gift, Kaito couldn't help but burst out laughing.
In Mikoto's eyes, Gekota was her favorite thing. So, offering her most beloved item as a thank-you gift to Kaito wasn't wrong.
"Alright, I'll look forward to your gift."
Kaito finished laughing and reached out to pat her hair gently.
Don't be fooled by Mikoto's current...
Tomboyishness?
But you have to look at her mother!
Mikoto was a promising prospect!!
Just look at Misuzu. Although she was easygoing and bold, she had a generous heart and an exquisite temperament.
She was the epitome of an urban beauty.
It was just that Misuzu was too easygoing. So, she didn't focus on dressing up. If she styled her hair nicely and wore coordinated clothes, she would undoubtedly be one of the most eye-catching beauties.
Just like Sayuri, who was beside Misuzu.
She wore a white kimono with red patterns, her hair intentionally styled up and secured with a very delicate hairpin.
Her temperament... tsk tsk tsk, she could easily pass for a princess from this era.
After all, the Demon Slayer World's timeline was like that.
"Haha, I'll have to trouble you with this, Kaito."
Misuzu also stroked her daughter's hair with a hint of heartache, then expressed her gratitude to Kaito.
Next, everyone began to chat casually. As the host, Kie recommended nearby tourist spots to everyone.
Naturally, she also called all her children to greet them.
Her eldest son Tanjiro, second son Takeo.
Her eldest daughter Nezuko, second daughter Hanako...
'Wait?'
'Was someone missing?'
"Ahem, Mrs. Kamado, you have only these four children, right?"
"Yes, may I ask why?"
"Oh, no, no, it's nothing. I just need to prepare gifts."
"Kaito, I really can't let you spend any more. I've already received your gift, and it's not a holiday. There's really no need for gifts for my children."
Using this topic to deflect from his true purpose, Kaito shook his head helplessly, insisting that he would give out his gifts while also feeling resigned about the changes to the plot.
He remembered now. Tanjiro also had two other younger brothers.
The third son, Shigeru, and the youngest son, Rokuta, who was around one or two years old.
Now, they were gone.
Kie only had these four children.
Well, it didn't matter much.
Anyway, he was indeed going to give gifts, especially to Nezuko.
Hehehe...
It just so happened that when he was doing his gacha pulls, he got some really nice rewards!
"Tanjiro, come here."
"Huh? Okay, Uncle Kaito!"
"..."
"Cough, cough, cough!!"
"Just call me brother. I think I'm still young!"
Even though he was now a father, he was still a young man who had just graduated from university a year ago!!
"Oh, my apologies! Kaito-nii!"
Tanjiro, quick to correct his mistakes, scratched his head sheepishly and then bowed deeply to apologize.
Looking at Tanjiro, his favorite male protagonist, Kaito smiled and beckoned him forward, reaching out to tap the scar on his forehead. A gentle green light flickered, and his original scar vanished.
"Brother... your scar is gone!"
Nezuko was shocked from the side, as were Mikoto, Eriri, and the other two children.
Only the three ladies, Kie, Misuzu, and Sayuri, remained calm.
"My scar is gone? Really!? Let me see!"
Tanjiro excitedly touched his forehead, but couldn't tell by feel. So he ran to the garden and looked at his reflection in the water basin.
"My scar really is gone!? Kaito-nii... are you a god!?"
Even though Kie had told them that Kaito and the others were from other worlds and possessed extraordinary powers, these concepts were too advanced and difficult for Tanjiro and the others to comprehend.
Thus, attributing inexplicable things to gods, and powerful beings to deities, was common in this era.
Besides, they had appeared out of thin air, Kaito had produced a gift for his mother from nowhere, and now a tap on his forehead made his scar disappear… if that wasn't a god, then what was he, a Demon!?