I have recently done some reading on the International Military Tribunal for the Far East as well as the individual participation of Japanese generals and officers in either sanctioning or initiating particularly brutal practices towards PoWs and civilians in occupied territories. However, I am curious to know whether this extreme harshness that the I.J.A. is largely remembered for today is unique to its conflicts from the 1930s onwards, or whether they had a history of poor treatment prisoners and subjects in previous wars.
More writing on this subject is always welcome; in the meantime, you may be interested in this previous thread on the same matter, with input from u/amp1212 (who also has more on the topic in another thread linked there) and the now-deleted u/SteakSundae.