The "elite student in music room 2" turns out to be Haruki's delinquent classmate, Kazusa Touma.  With his characteristic pushiness, he tries to get her to join the light music club.  But his pushiness backfires, and only makes her more annoyed.  Setsuna gets irritated... no, involved, and approaches Kazusa secretly.
So you were the Touma 
she meant, after all.
Also bist du die Touma, von der sie sprach.
Así que tú eras la Touma de la que hablaba.
Así que tú eres la 
Touma de la que hablaba.
Alors c’était bien toi,
 ce Tôma…
Então a Touma era você mesmo.