Yes, I've had a head start on the subject of WW1 German POWs in Japan while writing an article for the Wehrmacht Awards Forum. Sorry, but I don't know how to insert links here. There in the Japan Forum, the article is titled "Beethoven’s Symphony Number 9, Odes to Joy in Captivity ".
Basically all the POWs can be looked up. A great number of them remained in Japan after their release and quite a few famous Japanese brands today owe their existence to the Germans, who became members of Japanese society, Bridgestone Tires being an example. Anyway, it is a fascinating area of study for me, which is why I made an exception and posted on this forum for the first time.