This story is a sequel to Flash Sentry, Defender of the Peace S4
Several weeks have passed since the Fall Formal and Canterlot High is back to normal, well...almost. But as the school prepares for a music festival, three strange girls appear with dark aspirations. Can our high school heroes find out what they're planning and save the day, or will Canterlot High fall to these girls' dark melody?
Edited by KingJoltik
Now on TVtropes