[Sangetsu]

Being Asian, you are probably more likely to have a hard time in Japan than your girlfriend. That's not to say that people will treat you badly, foreigners see few problems with racism here. The problems you might have would be mainly official, as police tend to check non-Japanese Asians for their residency cards more often than they check other foreigners. Filipinos and Southeast Asians probably have more cause to think that Japan is a racist country than black people do.