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.
Why is she being so 
persistent about this?
Weshalb ist sie so hartnäckig?
¿Por qué ella insiste tanto con eso?
¿Por qué insiste tanto?
alors pourquoi 
ferait-elle tout ça ?
Por que tanta persistência dela?