Looking at this image and the one before, it seems like she blushes a bit when being talked to.
Either she does have something for otaku, or she is very awkward and shy with people in general.
But looking at the pout in the next one...
Go back and recheck every time she shows up. I think she use the music lyrics as a way to talk to him.
I can't see anything but you
Kiss me here and now
ここでキスして。(Kiss Me.) - 椎名林檎 (Shiina Ringo)*Train rushing by*...Senpai?She noticed meAh...
H... Heeey......I'll be checking out the concert at the cultural festival, so-Otaku-ku~n?
Otaku-kun!