 In July 1948, he signed to the Nippon Columbia label and released his first single called "Kimi ni sasageru Boku no Uta", composed by Kanae Wada.In 1971, Mizuki recorded the song which was used as the opening theme for "Genshi Shōnen Ryū".This began his foray into recording well over 1200 songs for various soundtracks as well as original singles and albums.