After another spat, Hummy has Hibiki and Kanade trade places for the day.
Tropes:
- Annoying Younger Sibling: Souta turns his pranks on Hibiki while she's staying with the Minaminos.
- Combination Attack: Cure Melody and Cure Rhythm get a new attack, Music Rondo Super Quartet.
- Swapped Roles: Hibiki and Kanade takes each other's places for the day.
