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Body count of 912 while in the Chinese Mafia: Japanese forces surrounded Nanking on 9 Dec 1937 and commenced hostilities the next day.
Body count of 3712 over 4 years during a World War (Assuming the LN is set in 2014 - the year of publication - and the character was 94 years old at time of death, this would have been from 1940-1944, so it's referring to WWII even if it's not a direct reference to Nanking): The Nanking Massacre started in December 1937 (and would persist through to February 1938), like you stated.
The main character lived to 94, died of old age and was never tried for murder (see Chapter 1): Prince Asaka Yasuhiko was never tried for the Nanking Massacre as he was a member of the Imperial family, and died of natural causes at the age of 94.
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