Mio is hosting a fashion show that will debut her new premium rare dress for her brand. However not all things go to plan when Aine's little sister Momone shows up and wants to be in the show and one of her guests appears to be late. But luckily Mio has an idea to turn things around.

The line-up for the Diamond Friends Cup is decided with Pure Palette facing Honey Cat on the first day. Also with Christmas around the corner, the Friends decide to exchange gifts, but Aine has trouble finding the right gift for Mio.

Love Me Tear is hosting the annual Aikatsu Song Battle with Karen captain of the White team and Mirai captain of the Red team. Members of Pure Palette, Honey Cat and Reflect Moon divide between the two teams and perform songs for the audience. However back stage there's a mystery to solve, when Coco suddenly disappears from the Aikatsu Mobile the idols decide to investigate.