Wei Shaolan, a Chinese woman who was forced into sex slavery as a so-called "comfort woman" for the imperial Japanese army during World War II, died on Sunday at age 99. /VCG Photo

Wei, who gave birth to a half-Japanese son and publicly admitted it, passed away at 1:20 p.m. in the city of Guilin, south China's Guangxi Zhuang Autonomous Region, on Sunday. /VCG Photo

Captured by Japanese soldiers in 1944 at the age of 24, Wei was forced to serve the Japanese military as a sex slave in a military brothel for three months before escaping from the facility. She found herself pregnant, with a boy of Japanese descent born later. The boy got a Chinese name and is now in his 70s. /VCG Photo  

An estimated total of 400,000 women in Asia were forced to work as "comfort women" for the Japanese army during World War II. Nearly half of them were Chinese. /VCG Photo