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.
Your old memories will disappear...
Los recuerdos anteriores se borrarán.
Desaparecerán todos tus recuerdos anteriores.
Suas lembranças antigas
 vão desaparecer...