I'm reading about the demographics of comfort women in wikipedia and I realised these curious findings:
Chuo University professor Yoshiaki Yoshimi states there were about 2,000 centers where as many as 200,000 Japanese, Chinese, Korean, Filipino, Taiwanese, Burmese, Indonesian, Dutch and Australian women were interned.[59]
In further analysis of the Imperial Army medical records for venereal disease treatment from 1940, Yoshimi concluded that if the percentages of women treated reflected the general makeup of the total comfort women population, Korean women made up 51.8 percent, Chinese 36 percent and Japanese 12.2 percent.[30]
Source: https://en.wikipedia.org/wiki/Comfort_women#Countries_of_origin
Did the Imperial Japanese really force one of their own women to become comfort women? I'm aware that they're brutal but not this wantonly brutal since, like any other fascist group, they tended to give more privilege to members of the "superior race", who in this case were the Yamato Japanese.
Thanks for reading.
In very short answer, no history scholars with seriously academic background would deny the claim of the existence of Japanese comfort women.
While they seem not to have reached an agreement on the exact statistics/ statistical ethnic divisions of the estimated demography of comfort women, it is clear that many comfort women (especially in southern China) were also drawn from Japan.
This a bit old site of Asian Women's Fund (Bilingual: Japanese and English) includes some basic information on comfort women also in English, conveniently citing many estimated statistics on comfort women from research in Japanese conducted by the end of the 20th century.
Table(s) of the following page will especially be useful to answer OP's question: Number of Comfort Stations and Comfort Women
The underlying documentary regulation on the travel regulation of Japanese women to China who meant to engage in prostitution, called “Concerning the Management of Women Traveling to China”, issued in 1938, is also translated in here with an introduction: https://www.japaneseempire.info/post/concerning-the-management-of-women-traveling-to-china