She's an up-and-coming idol who hit the charts within a week of dropping her debut CD. Yuu knew her growing up—they're childhood friends—and they've got their own little dynamic going: she calls him "Niko-kun" while he calls her "Tama-chan."
Fuuka's basically obsessed with her music in the best way possible; she gets genuinely emotional listening to her tracks, sometimes to the point of tears. One of her songs even landed as the theme for a popular film called "Half & Half."
Yuu's sisters like to joke that now that she's famous, she'd never bother responding to him if he tried to reach out. But that's not really how it went—she actually slid into his DMs on Twitter.
Content compiled by AnimeList.moe from publicly available sources.