Mikoto visits Yui 11.1111, in her school for (commoners).This is another of chapter that dint fit into Electric Princess as it work on assumption that the Sisters was not been exposed. It probability fit more to separate arc that will belonged to Yui, but we putting it here. (Plus this one kinda don't chain up on the episode with Yui and the gymnasium hall.)
Let's say about the scenario that Kuroko doesn't know about Sisters in the sense that she should have. Like she don't have any of the supposed knowledge from the arc. Yet, it shall be impossible to conceal a gossips that someone that look like Misaka Mikoto and have same surname and ability like her; attending a commoners school that is not in the garden of education. So the red head detective is on investigation. And guess (Who?) is tagging along, after overheard the red-head phone conversation.
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Misaka Yui (11.111) sits in her classroom and gives her attention to the teacher's explanation. Yet (something?) distract her attention and she look toward the hallway. Trio of her roommates (or teammates as she refer to them), who know her well enough to know that this is (not normal?) for her to do, during a class; noticed that change. She even seem to be (pleasurably surprised?) as if she noticed that a (friend) is paying a visit to her. Her teammates even got confused of seeing a smile on her face.
Then there was a shouting on hallway, as a voice too similar to Misaka's, exclaims a command with authoritative tone of voice. "Kuroko stop!! You cant just, to break in!!" Then the entire class can hear it, even if is numbed by the door, that there is a wild discussion as the somehow familiar voice talking to a new on. It attract attention of entire class, the teacher include.
Except Yui's eyes wide open in fear as she realized that Shirai Kuroko was almost at the door. It was as if she panicked as she looked around the classroom left and right before getting up from her seat without saying a word. Seeing her; Someone would think she was running to escape the classroom. Like to use the second slide doors on opposite of the room, to get out right at moment, when the duo will be passing in through the first one. Or like she will use the window, to climb out, onto the rain draining pipe heading from roof all way down toward the draining canal. No, she was running to the back of the classroom. More precisely, she headed to the metal rectangle closet for cleaning supplies. Like a professional, (who done it several times already?), she quietly opened the door, slipped in and closed it behind her. No need to be worry about buckets or browns.
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A moment later, the door to the classroom opened and the two from Tokiwadai entered, elegantly like a ladies. They were having a conversation with each other and the brunette was clearly displeased, even if it was clear that everybody there had they eyes on her. The short red haired address the teacher, while elegantly showing her Judgment green arms branch.
Railgun scanned the entire classroom (with her eyes and her radar) and with the words: "Let's get over with this. Yes!; I am Misaka Mikoto. No!; I will not fire my Railgun from a window to prove it. Neither, I will not use my abilities on fifth level, to make point." She walked over to where Yui was sitting before. As (lady?) with crossed arms and legs, she sat down on that chair. She completely ignored the astonished expressions and comments from the students sitting around. "See, Kuroko? Someone from Tokiwadai would act like a fence post here. Or it was you fantasy to see me, at random, attending other classes of other schools across the Academy city?"
Kuroko tried to object but Mikoto cut her out. "Can you just stop mingling into other peoples personal lives? Besides, what's your problem? Who cares?-- that someone looks like me? It's not unusual that many, in order to advance to a higher level, imitate those who are on it more than is healthy. Besides, I'm a level -5, and a famous! Do you even know how many doppelgangers I have? It's clear that imitation is not enough. Can you even process how many study fields tapping on Level-5? So many students think that when they will be like me, they will to become a Railgun. That's not how it work, but still they will try it. Mass producing Railgun is simply not happening. And its not like they can take advantage of it."
She gets up from that place. "This pit-stop walk is a waste of our precious time. We're going there now!"
Kuroko tried to argue.
But Mikoto grabbed her kōhai cheeks and start her deforming it in a clear punishment. "Why I shall I bothered by some privacy violation by someone who don't even attend Tokiwadai?! When the biggest pervert from Judgment self-invited herself onto my room?!" Releasing the redhead she grab Shirai's hand. "Enough! Obviously our answers lie somewhere else." Then, she glance at the class in awe. "And the rest of you: Sorry for the interruption. And…" She obviously hesitated… as if glancing toward that metal closet, but dint want to (expose?) that she know? "Take care and good luck!"
She immediately pointed to the window. "Kuroko, Let's go!" A moment later, the duo teleported out of the classroom, sprawling a wild discussion between students.
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Moments later, Yui peeked out of the locker into the classroom. Seeing that Shirai was not around, she went to her desk. She immediately noticed, the small gift that her sister had left behind. It was a thimble in the shape of a (frog) Gekota figure. Misaka slipped it on her finger, looked at it, exterminate it, and at end she sighed. "One sama, your ability to choose a suitable gift,-- still sucks. Misaka sighs with a sense of personal defeat."
Then she finally noticed that the entire class was staring at her in silence. "Oh…" They, knew her well enough to know whats will happen next. So, everyone, together with her, chanted her mantra, that she already uttered so many times: "It's just a coincidence that I have the same face, same name, and same abilities; as Misaka Mikoto."
*
Note: About Index cat, the calico named Sphinx. She once noted "Oh, its boy." Because of genetic of Calico cats, due to genes the male calico cats are quite rare and the rate is like 1 to 3000. Its like a wining a lottery. So I found it funny, that poor Kamijou having a literal treasures at his apparent, and yet he founding himself in "I am broke!" situations like when the ATM network were off, bank closed due holidays and few yens in a pocket.