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.
I need to stop myself
Tengo que ir a la escuela a impedir que 
me presente de una manera extraña.
Tengo que ir al instituto e impedir que me presente de una manera ridícula.
Eu tenho que me impedir