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.
I guess trying to force you to 
join was a bad idea, after all.
Es war wohl eine schlechte Idee, zu versuchen, 
dich zum Beitritt zu zwingen.
Supongo que sí fue una mala idea 
obligarte a que te nos unieras.
Supongo que sí ha sido mala idea 
querer obligarte a unirte al club.
C’était une mauvaise idée 
de vous forcer la main, comme ça.
Acho que não foi boa ideia
te forçar a entrar, no fim.