First conversation with Yuki

"Onii...chan? Wait, don't tell me, are you Yuki?!""Yes!!! Finally I'm meeting you! I was one year old when you left". Kei was confused. What was his sister doing there? Wasn't this a school for highschoolers? (It wasn't) Wasn't she in elementary school? But then he asked "How did you recognise me? We haven't seen each other in years, you definitely forgot what I'm like!". He received cold stares, but didn't notice. Anyway, his sister's answer was "Idiot-nii told me that I would have understood seeing you". 'Idiot-nii?'"Anyway, what are you doing here?""You kno~w, this school prepares for life more than the other one, so I'm attending, a~nd I wanted to meet you, after all you are the only brother that I don't really know. As more Chiyo-nee is kinda worried""Wasn't this school for highschoolers?""Most people are highschoolers because the subjects are difficu~lt, but no. For example I started coming this year and Aoki last year. Why~ does he always have to be a bit ahead of me?! He's born only one year before me! We are practically twins!""Wait, Aoki's here too?! How did I not notice before?!". By the way, Aoki was obviously Kei's little brother (I'm talking in the past, but nobody is dead). Nobody was asking who he was because, as you know in their family they are all quite famous. For example he helped the police hacking criminals' computers (pretty dangerous, I know. The family is all quite worried). Then Yuki said "Even Chiyo-nee and Idiot-nii attended here at our age, though Idiot-nii attended only courses regarding sports""Then why didn't I attend?""They told me you were studying at home, for some reason Chiyo wanted to keep you at home. She told me it was for you and for the family". Kei had a puzzled expression while Aikawa seemed to be ready to bite someone. Alex instead was unusually lost and started playing with his food (he shouldn't have, he ended up wasting quite a bit of chips to make a castle like with cards). Anyway Kei was thinking 'Why did Chiyo-nee want that? Was she simply being overprotective?'. "Ah~, I don't agree with Chiyo-nee's methods, but I understand her reasoning, even though it is crazy". Kei looked at her with a puzzled expression again, but this time Aikawa too. Now Yuki answered "It's too much to explain". Then she looked at Aikawa and Alex and said "If not prepared enough, their brains might explode and you might faint""Then how do I prepare?""What do you think this school is fo~r?". Kei blinked, lost again. Then the bell rang and Yuki turned her back going to class, and unfortunately her skirt moved 'thanks' to the wind, making many boys turn towards her.