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.
Then work something out 
before the end of the day.
Dann überleg dir etwas 
bis zum Ende des Tages.
Entonces arregla algo 
antes que acabe el día.
Entonces, arréglalo antes de que acabe el día.
Dans ce cas, 
règle tes affaires aujourd’hui.
Então resolva isso até o fim do dia.