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.
And then we'll decide if you 
can participate or not.
Dann werden wir entscheiden, 
ob du daran teilnimmst oder nicht.
Entonces decidiremos si 
puedes hacerlo o no.
Y entonces decidiremos 
si puedes hacerlo o no.
Ensuite, nous prendrons 
une décision.
Então, vamos decidir se
você pode participar ou não.