when my brother went to Japan... he and his friend went to a "japanese only" bar... his friend is japanese... i think that if you behave your self and respect and watch their manners and copy it... never highlight your existence... haha.. doing that I think you're just fine...

now... I don't think there's too many places like this.. and they are mostly bars and nigh houses...

probably the owner of the restaurant was against gaijin... idk. they can get really racist.

we're half japanese though... my grandparents are Japanese and we we're always close to them