The guard students should really work on their information network.
On a sidenote:
according to Miku's character profile her hobby is Intel gathering and she likes to know things others don't.
I would say she failed. Hard.
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For those being surprised that Miku doesn't even know who Yuri is. I expected as much. Yuri even admitted she admired Miku from afar, she's pretty much Miku's stalker. Miku on the other hand doesn't give a damn about what other people do or think about her. That is, unless they really bother her or piss her off. As long as you don't do anything to trigger her, you fly under her radar. Lets forget, Miku wasn't like she is now. Meeting Sou made her this way.
The old Miku was known as a man-hater - because men usually dislike her attitude and they are appalled by her features, especially her massive... well, let's say, Miku isn't considered attractive for 1:39 boys. As a result she was mostly focussed on being the best in her grade, and she treated boys and classmates with nearly the same condescending attitude because she knows she will be disliked by most oeople anyways. She's somewhat of a delinquent and gets by because she has the best grades in the year and is strong enough to make others obey.
It will be amusing to see Team E coming back to their class. But it will be quite some time until then.
Sou:
Yuri-chan... your road to "Yuri" with Miku is going to be a long, steep one...
That road might very well lead through your bedroom.