The three girls are practicing together in the cold weather. They've been practicing since they became "full-fledged undines" , which means they're older than they were when they were "apprentice undines." Akira and Athena used to practice with each other all the time, but they haven't been able to find an excuse to do so. One day, they hear a rumor that one of the apprentices at their company is as good at singing as they are, so they decide to start practicing today with her. The girls agree that one day, things will change, and they'll be unable to meet each other as often as they used to.