[quote=@SilverPaw]
A few more questions. How are the usual international relations or transfers between DHA branches? I get that various hunters are being sent to Japan because of an emergency (or a developing unusual situation), but are there regular international missions too? If one moves to live elsewhere do they join that country's branch while they reside there?
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Wherever there's people, there are politics, intrigue, and the usual power games we know and love. Trying to paint a map of how every possible division/branch would feel in relation to one another is kinda hard. But for simplicity's sake, let's say that even if not friendly, they try their best to not be hostile to one another since infighting would be the last thing the want when there's bigger fish to fry.

Also, the fact that Hunters from other countries are coming to Japan, should be indication enough that it's ok to work abroad as long as you follow the rules.

[quote=@SilverPaw]
I forgot to ask this before, but are there enchantments which conceal unusual hunting items (e.g. firearms in Japan would stand out) from mundane people? How widespread is the knowledge about devils among people who have nothing to do with the DHA in any case (does the government know and cooperate)? Do hunters have the cover of being 'special agents' so they can get access to places or have authority over regular people in certain situations, for example if they need to access/evacuate a building?
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Depends. There's a limit to how much you can expect to conceal. Maybe hiding a handgun with enchantments and all would be possible (but probably hard/expensive to do), but concealing a rifle/shotgun around would be really hard.

For the most part, demons are legends and myth for normal people, as explained before. There are exceptions, like people who encountered one by accident, etc., but they are far and few between.

As for government and businesses? It's not common knowledge between Hunters and Demons whether such large organizations would know something about their activities. It's certainly possible, though.

But, no, you don't have any working deal with the government or can pass as agents of any nature.