A Tokyo museum focusing on wartime sex slavery is holding an exhibition on how Taiwanese women exploited by the Japanese military have struggled to recover from their ordeals.

The Women's Active Museum on War and Peace, better known as WAM, has collected documents and testimony on the sexual exploitation of Taiwanese women "to hand down to the next generation," said Eriko Ikeda, the museum's director.

"The victimized women are aging, and the hardships they went through will be forgotten if we leave them lost in history," she said, referring to what she described as persistent efforts by detractors to gloss over Japan's past misconduct.