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.
or the best friend I ever have.
oder zu der besten Freundin, 
die ich je haben werde.
o la mejor amiga que haya tenido.
o la mejor amiga que haya tenido.
ou a melhor amiga que já tive.