Setsuna Yuki

Setsuna Yuki was one of the five founding members of the Nijigasaki idol club, but she abruptly quit before the story begins, unable to handle how deeply her own feelings about being a school idol had grown. What nobody realizes at first is that she never really left the school at all: she secretly became the student council president under her real name, Nana Nakagawa, hiding her identity from almost everyone, including her own former club.

Once her secret comes out, the warm, enthusiastic side of her personality that she had been suppressing finally shows through. She turns out to be charismatic and full of genuine love for singing, the kind of energy that is contagious once people get to see it. It was actually Setsuna, acting as Nana, who set the challenge that convinced the other members to bring the club back to life after it had fallen apart.

Shioriko Mifune was close friends with her even before the truth came out and kept her secret the whole time, showing just how much trust existed between them. After rejoining the club for good, Setsuna becomes part of a subunit called A-Zu-Na alongside Ayumu Uehara and Shizuku Osaka, finally getting to perform as the singer she had been hiding inside the student council president the whole time.