美空ひばり
She was promoted alongside Mari Amachi and Saori Minami, and they were dubbed the "San-Nin Musume" (Three young girls). Before them, Hibari Misora, Chiemi Eri and Izumi Yukimura were promoted in the same fashion. In 1973, Amachi, Koyanagi and Minami were followed by Momoe Yamaguchi, Junko Sakurada and Masako Mori, who were known as "Hana No Chu 3 Trio" (The Trio of Third-Year Junior High School Students).