I don't know much about Japan, but I'm fairly familiar with how WW2 is taught in Germany/Austria.
Much of the focus is on the political conditions, failures and other things that led to the rise of the National Socialist Party and Hitler. The war is seen as a disaster which was inevitable once the country went down a terrible path. In terms of the actual conflict itself, most of the books and material you see focuses on either Blitzkrieg and the rapid conquest of Western Europe, the Battle of the Atlantic or on the Eastern Front (which receives the vast majority of the attention). German movies about the war are inevitably set in the east (with a few exceptions).
Nearly everyone my age in Austria has multiple great grandfathers (or grandfathers) who fought in the war. It's not like it's a friend here or there like in the USA, it's literally everyone who had multiple direct relatives. The horrors of the conflict in the east are just something that everyone grew up hearing tales of.