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.
You're really pissing me off...
Du gehst mir echt auf die Nerven.
Empiezas a molestarme...
Empiezas a tocarme las narices.
Tu es fatigante, à force.
Você está me irritando de verdade...