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.
Shot down right away?
Das war schnell.
¿Sin dudar?
¿Lo dices sin dudar?
Tu veux m’achever ?
Sem hesitar?