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.
To tell you the truth, 
I've joined the Light Music Club.
Um ehrlich zu sein, bin ich dem Club 
für Unterhaltungsmusik beigetreten.
De hecho, me uní al Club de Música Pop.
Me he unido al club 
de música pop, ¿sabes?
En fait, j’ai rejoint 
le club de musique pop.
Para falar a verdade, eu entrei
no Clube de Música Popular.