Gil Won-ok, one of the last survivors of sexual slavery for Japan’s World War II troops, who campaigned to bring international attention to the suffering of thousands of women like her​, died on Sunday at her home in Incheon, South Korea, west of Seoul. She was 96.

Her death was confirmed by the South Korean government. Officials said that in her last years she had been diagnosed with Alzheimer’s disease.

To her final days, Ms. Gil had fiercely criticized Japan, accusing its government of ​refusing to take legal responsibility for sexual slavery and offer compensation to the victims, euphemistically known as “comfort women,” who were raped repeatedly in military brothels.

She died with her demand unmet,​ but she had said that the campaign for justice ​would continue after her death.

“They are wrong if they think it will be over when the last of us die,” Ms. Gil said in 2013. “There will be our descendants continuing to campaign as long as it takes to get the apology we deserve. It will not be over with our death.”

Despite the stigma, about 240 South Korean women came forward to report their painful past as comfort women after the government began accepting registration in the early 1990s. Today, only seven of them, with an average age of 95, survive.