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.
I'm three years younger than my sister.
Ich bin drei Jahre jünger 
als meine Schwester.
Así que soy tres años 
menor que mi hermana.
Así que tengo tres 
años menos que mi hermana.
J’ai trois ans de moins 
que ma sœur.
Então sou três anos mais novo que minha irmã.