The Amusement Club is cleaning the club room in preparation for new students and perhaps new members.  Opening a mysterious closet they discover a device that sends Akari back in time, with she takes as a chance 

to fix her mistakes.
It must be the theater 
club's prop or something.
Eso debe ser parte de 
algo del club de teatro.
Está claro que será parte del atrezo de alguna actuación del club de teatro.
Deve ser do Clube de
 Teatro ou algo assim.