She met Yuuki when she was having trouble calculating discounts while shopping, and finally Yuuki helped her calculate the discount on groceries she brought, after which Suzuna called Yuuki "Hidesai" (most likely Suzuna wanted to say "Shuusai" (talented) but misread the kanji),
Illya is probably the smartest person in the room right now...
Well, to be fair to two of them, one is an amnesiac and the other one is an elementary school kid in real life despite her aspirations.
Suzuna though...
Whiz-boy
Soz ♪
Soz ♪Huh...?
This is an academy, right...?Are they gonna be alright...?Huh?
What was it again?Hey...
What's the meaning of this "whiz-boy"?That thing with "whiz"...Uーm...Ahー...
I forgot ♪You forgot...Ah, that was it, yeah!*Fwip!*Whiz kidLeave it to whiz-boy!
I'm glad you remembered~ ♪You're the one that told me, but I forgot ♪Neー ♪Rightー ♪But whiz-boy's gonna whiz-boy~ ♪