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.
Then that only leaves a week before the fair.
Dann wär das nur noch 
eine Woche bis zum Fest.
Eso solo deja una semana más.
Por lo que solo quedaría otra semana.
Même dans ce cas, 
il ne resterait qu’une semaine.
Com isso, sobra só uma semana.