Akari, Sumire, and Hinaki host an awards show for the various Aikatsu performances. Ichigo, Ran, and Aoi eventually join them while Juri runs a marathon of sorts as a background event.
This movie covers the event that’s mentioned in the parent series‘ 145th episode, and takes place some indeterminable time after the 147th episode. It ends up being exactly what it sounds like; an ‘awards’ show that highlights various performances from the TV show’s second and third seasons by declaring them the winner of made-up awards. Unlike the previous movie you actually can watch this as a stand-alone if you just want to experience some of the series’ musical segments.
More Information:
aniDB
Wikipedia