She studied at the Toyo Eiwa Jogakuin and began writing children's stories when she was encouraged by translator Hiroko Katayama.

After graduation, Muraoka returned to Yamanashi and taught at a branch of the Tokyo Eiwa Jogakuin there.

[3] Katayama encouraged her to translate Mark Twain's The Prince and the Pauper, and this helped her resume her normal routine.

The show became very popular, and children all over Japan called her Rajio no Obasan (ラジオのおばさん, "Aunty Radio").

[3] In 1939 Muraoka was given a copy of Anne of Green Gables by her friend Loretta Leonard Shaw, a Canadian missionary.