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.
Yeah. It stopped working 
after I arrived in the past,
Sí, aunque se dañó 
cuando fui al pasado, pero
Sí, aunque se averió cuando fui al pasado.
Sim. Parou de funcionar 
quando eu cheguei no passado,