Haruki is entranced by Setsuna's singing on the rooftop, and plots to get her to join the Light Music Club no matter what.  But she hates standing out, so convincing her is incredibly difficult.  Meanwhile, the club has an even bigger problem.  The elite student from Music Room 2 he was trying to persuade to join his club as the keyboard player isn't a member of the Music Class, it's a mysterious person whose class and identity are a total unknown.
So he can keep up with us 
even without much practice.
Also kann er auch ohne viel Übung 
mit uns mithalten.
Entonces podrá tocar con nosotros 
sin mucho tiempo para ensayar.
Entonces, seguro que podría tocar 
con nosotros sin ensayar demasiado.
même sans avoir beaucoup 
de temps pour répéter.
Então, ele pode tocar mesmo sem ensaiar muito.