When Kobayashi was 9 years old in 1963, she became a champion in the TBS-produced "Uta Mane Tokuhon" (歌まね読本) music variety show and was scouted by famous Japanese composer and guitarist Masao Koga.

Although Kobayashi was only a grade four student, her voice was said to be exactly like well-known Japanese enka singer Hibari Misora.

However, after 1968, Kobayashi's level of celebrity dropped, thus causing her to get fewer TV appearances and other opportunities.

As a result, she was asked to take part in the illustrious annual end-of-year music show "Kōhaku Uta Gassen".

[6] Kobayashi also had a recurring "Virtual Grandmother" segment in 2019 Vtuber sketch comedy show, "VIRTUAL-SAN - LOOKING".