Hibiki Uozumi

Hibiki Uozumi (魚住 響姫 Uozumi Hibiki), called Siren no Kimi, is the director of the school PA club. She and Kana Suoin are finalists of the election of the seventy-fourth elder sister; She hands over her votes to Kana because she adores Kana. And so, Kana becomes the seventy-fourth elder sister.