Yamane Keiko was born as the second daughter on Ishigaki Island in 1924. She went to Taiwan with a friend in 1940.
She initially worked as an assistant in a confectionary and a domestic worker in Taipei. Later, she became a telephone operator.
In 1942, she returned to Ishigaki Island for a holiday, and happened to become a nursery school teacher. The following year, she married an Ishigaki Islander. Although the newly married couple intended to migrate to Japanese-controlled Micronesia (Nan'yō), they were held up on the way in Taiwan. Eventually, they decided to stay in Taiwan and repatriated to Ishigaki Islands after the war.