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.
from: Setsuna Ogiso 

 sub: I convinced her! 

Let's get to work!
Von: Setsuna Ogiso 

 Betreff: Hab sie überzeugt! 

Machen wir uns an die Arbeit!
¡Vamos a trabajar!
¡A partir de mañana tenemos que darlo todo!
Mission convaincre les vieux réussie.
 À demain !
De: Setsuna Ogiso  
Assunto: Consegui! Vamos ao trabalho!