In Asia and the Pacific, between 3 million and more than 10 million civilians, mostly Chinese (estimated at 7.5 million), were killed by the Japanese occupation forces. The best-known Japanese atrocity was the Nanking Massacre, in which 50 to 300 thousand Chinese civilians were raped and murdered. Mitsuyoshi Himeta reported that 2.7 million casualties occurred during the Sankō Sakusen. General Yasuji Okamura implemented the policy in Heipei and Shantung.
https://courses.lumenlearning.com/suny-hccc-worldhistory2/chapter/casualties-of-world-war-ii/