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.
Like I said, I don't care.
Wie ich sagte, ist mir egal.
Te dije que no me importa.
Te he dicho que me da igual.
Ce ne sont pas
 mes affaires.
Já disse que não me importo.