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.
Wasn't it because you were having fun?
War das nicht, weil du Spaß dabei hattest?
¿No fue porque te divertías?
¿No era por diversión?
Tu n’y as pas 
pris du plaisir ?
Não foi porque era divertido?