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.
None of your efforts meant a thing.
Keine deiner Bemühungen waren von Bedeutung.
Todos tus esfuerzos fueron en vano.
Todo lo que tú has hecho 
no ha servido de nada.
Tes efforts auront 
été inutiles.
Seus esforços não serviram de nada.