When she graduated from elementary school the family underwent a series of misfortunes, including her mother's death.

Her first hit was "Anta Honto ni Sugoi wa ne", which was released by Victor Records.

She continued releasing hits like "Gado-shita no Kutsumigaki" throughout the fifties,[1] and appeared on the Kohaku Uta Gassen several times.

While preparing for a role in which she would play a child with cerebral palsy, Miyagi visited a facility for disabled children.

Inspired by this, Miyagi started the Nemunoki Gakuen, a school for children with disabilities, in Omaezaki, Shizuoka in 1968.