Japan's army during World War II asked the government to provide one sex slave for every 70 soldiers, according to historical documents reviewed by Kyodo News service that highlight the state role in the so-called "comfort women" system.
The 23 documents were gathered by Japan's Cabinet Secretariat between April 2017 and March 2019, including 13 classified dispatches from the Japanese consulates in China to the Foreign Ministry in Tokyo dating back to 1938, according to Kyodo.
The sex slaves issue has been a source of a painful dispute between South Korea and Japan. The women were from Korea, Taiwan and Australia, the Philippines as well as Japan.
In 1993, then-Chief Cabinet Secretary Yohei Kono, the government spokesman, apologised for the "comfort women" system and acknowledged the Japanese military's involvement in taking women against their will.
The Kyodo reports shows one dispatch from the consul general of Jinan to the foreign minister that said the Japanese invasion had caused a surge in prostitution in the area, with 101 geisha from Japan, 110 comfort women from Japan, and 228 comfort women from Korea. It says "at least 500 comfort women must be concentrated here by the end of April" for Japanese soldiers. Presumably, the records imply that the women referred to as "geisha" might have come on their own, as opposed to sex slaves, who were coerced.