My college hangs the flag of the flag from most countries. Usually from international students attending our college. Recently they added the Japanese imperial flag.

https://en.m.wikipedia.org/wiki/Rising_Sun_Flag

However my memory is fuzzy but isn't this the flag the Japanese used during WW2 when they sided with the Nazi's. Does this flag have the same "stigma" of let's say a Nazi flag? If not why not if they fought on the same side? I go to college in the US if that helps.

Also we had a Japanese flag up already. Just curious.