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.
Though it might end up being a keyboard.
Auch wenn's am Ende 
wohl nur ein Keyboard sein könnte.
Aunque puede que tenga que ser un teclado.
Aunque puede que 
tenga que ser un teclado.
Ou bien du synthétiseur…
Se bem que pode acabar sendo um teclado.