With the advice given to her by her production company's stylist, Chiharu, the still idol-egg Aine begins her search for a brand that fits her. Although so many brands are around, it seems neither works.

Wanting people to discover the brand only for her, Sugar Melody, Aine thoughtlessly enters an audition to be the MC in Love Me Tear's event. On the venue, she meets Maika Chōno, an idol who loves festivals.

A famous world-class creator is to be chosen as a director for a commercial for macarons, with Mio going to be filming the commercial when they are faced with a surprise. However, the background music is an Ondo, and is not fit for a macaron commercial. It is up to Mio to make an impactful "Big Bang" CM when nothing goes as she had predicted.

Mio starts getting pumped up for she is trying to design a Best Friends Rare dress for Pure Palette. When Mio reaches a wall in designing, Aine invites Mio on a mystery tour planned by Aine herself. Walking along the lands of the forest, they reach the place known as "Hero's Bridge".

The last opportunity to participate in the Diamond Friends Cup, the Best Friends Cup begins, with Karen Island owned by the Kamishiro family being the stage. This year's theme is "survival", and first up is Honey Cat.

The second part of the Best Friends Cup starts, with Pure Palette taking their turn to face the challenges before them.