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.
like I did on the roof...
wie ich es auf dem Dach tat.
como hice en la azotea.
como lo hice en la azotea...
comme la dernière fois, 
sur le toit.
como cantei no terraço...