Its the flag of Zeon from Gundam, who are space Nazis. So yeah, you got the vibes right lol

Japan being uncomfortably cozy with Nazis must be a day ending with -y

That flag is a Nazi dog whistle and it’s calling out to “cultured weebs”. Now, not all anime fans are fascists but a lot of them definitely hide some fascist tendencies, you can spot them by their classic gatekeeping arguments and their obsession with lolis

Unrelated picture btw