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.
That piano would occasionally 
play along with my guitar.
Das Klavier begleitet 
ab und zu meine Gitarre.
A veces seguía mi guitarra a la perfección.
Suele seguir mi guitarra a la perfección.
De temps en temps, 
il accompagne ma guitare.
Às vezes, ele toca acompanhando
minha guitarra perfeitamente.