>>64514052
Japanese official documents on Chinese sex tourists from Nanjing (Nanking) in the 1600s and 1700s pumping and dumping Japanese teenage girls after getting them pregnant

http://www.eastasianhistory.org/39/vos-foibles

>As a matter of fact many Chinese seem to have worried about the education and future of such children. Huang Chê-ch’ing,12 a captain from Nanking, had a liaison with Yakumo,13 a girl from the Iwataya, and fathered a boy Kimpachi,14 his only child. In 1723, when he was 71, he returned to Nagasaki to meet his son. He then brought goods with him sufficient to take care of his son for the rest of his life and asked the Chief Administrator’s Office for a special permit to barter them.[55]

This was centuries before World War II

Chinese men from Fuqing, Fuzhou in Fujian province were grooming and importing Japanese women from Japan to Fujian, China in the 1920s, just a few years before Japan attacked China and set up Manchukuo.

https://desuarchive.org/his/thread/17164434/#q17164434

Han men did sex tourism in Japan for centuries during Sengoku Jidao, Edo period and Meiji restoration and fathered bastard children

Like Sun Yatsen, Cong Liangbi, Su Manshu's father, Sadaharu Oh's father.

Sadaharu Oh was born in Japan to a Japanese mother and Han Chinese father in Japan in 1940 in the middle of WW2.

https://en.wikipedia.org/wiki/Sadaharu_Oh
Japan never occupied entire provinces of China like Qinghai, Ningxia, Gansu, Shaanxi and Sichuan, west Guangxi, west Hunan, west Hubei, west Henan, most of Fujian, most of Yunnan, most of Guizhou, southwest Zhejiang, southeast Jiangxi, a big part of Anhui.