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'm not here to lecture you.
Ich bin nicht hier, um dich zu belehren.
No voy a regañarte.
No es esa mi intención.
Non, je suis venu te demander 
de rejoindre notre club de musique pop.
Não vim dar sermão.