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.
Anyway, Kitahara-kun is serious.
Wie auch immer, Kitahara-kun meint es ernst.
Como sea, Kitahara-kun va en serio.
Pero Kitahara-kun va en serio.
Quoi qu’il en soit, 
Kitahara est très déterminé.
Enfim, o Kitahara está falando sério.