Yamane Keiko was born as the second daughter on Ishigaki Island in 1924. She went to Taiwan with her friend in 1940.
She initially worked as an assistant at a confectionary and domestic worker in Taipei, then later became a telephone operator.
In 1942, she returned to Ishigaki Island for a holiday, and happened to become a nursery school teacher. In the following year, she got married with an Ishigaki Islander. Although the newly married couple intended to migrate to the South Islands, they were held up on the way in Taiwan. Eventually, they decided to stay in Taiwan and repatriated to the island after the war.