I've heard stories that say when the Japanese took German POWs after the fall of Qingdao in World War I, they were treated quite well. How did the Japanese treatment of POWs devolve from that to what was seen in World War II?

by HistoryLord
mikedash

I discussed the experiences of German POWs in Japan in this earlier answer:

What happened to the 170 German defenders of Tsingtao who were taken as POW's and chose to remain in Japan after WW1?

You might find it interesting while you wait for the more comparative response you're after.