山口百惠
Mari Amachi debuted in October 1971 with the single "Mizuiro No Koi". She was promoted alongside Rumiko Koyanagi 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).