The Cures catch up to Blue Cat as she reveals her true form as a transforming cat alien, revealing how she learned that the Star Color Princesses' power combined with Fuwa would unleash a great power that she wished to use to restore her people. Just then, however, the group finds themselves attacked by a vengeful Eyeone after she turns herself into a Notrigger. Seeing the Cures risking their own lives to protect her even after everything she had done, Blue Cat's desire to save them causes her to gain the power to become Cure Cosmo.

As Madoka laments over winning a piano concert that she felt should've been won by someone else, the girls travel to Planet Icesnow and discover the Aquarius Princess Star Color Pen is being used by a snowman alien named Yukio as a spare nose. Learning that Yukio wants to make the ice girl Iruma smile, the girls show him the fun things that can be done with ice and snow. Although Madoka struggles to make Iruma smile with a musical performance on icicles, Yuni contributes her singing to the mix, leading Madoka to realise that she should have fun with her playing.

The girls bring Yuni along to a summer festival, where she finds herself hesitating to have fun. Catching up to her, Lala tells Yuni about the fun she has spending time with Hikaru and the others, but Yuni is reluctant to prioritise friendship over her mission. Yuni is then confronted by Tenjou, who uses a multiplying Notray to capture Yuni and use her as a hostage against the others. However, the Cures manages to work with Yuni to rescue her and defeat the Notray. Afterwards, as the girls watch the fireworks together, the rocket receives a transmission from Lala's brother, Lolo.

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