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.
It's true that he was trying to 
rebuild his band before that,
Es stimmt, dass er davor 
seine Band wiederaufbauen wollte,
Es cierto que intentaba reformar 
su banda antes de eso,
Es cierto que intentaba reformar el club antes de eso,
C’est vrai qu’il essayait 
de reformer le groupe,
É verdade que ele estava tentando
reconstruir sua banda antes disso,