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 sorry for dragging you out here.
Entschuldige, dass ich 
dich hergeschleppt habe.
Perdona por arrastrarte hasta aquí.
Siento haberte arrastrado hasta aquí.
Désolée de prendre ton temps.
Sinto muito por arrastá-la para cá.