So, does anyone have any suggestions within this narrow criteria?
Haha ... you've really narrowed down the window there!
I've turned a lot of crap off after only 3 or 4 minutes recently, but there have been a couple of shows that have pleasantly surprised me.
One of those is "The Devil is a Part Timer", but it fails on your "not in Japan" criteria.
It's a cute and funny (to me, at least) take on transporting a "sword and sorcery" hero and villain into modern Japan where they end up working in McRonald's and a Call Center to make ends meet, and slowly becoming almost-friends.
Using nano.RIPE's beautiful "Gekka" as the end music (after the first few episodes) is a nice bonus.
Another thing that seems to have recently turned up on Netflix that I'm enjoying is "Gargantia on the Verdurous Planet".
That's about a teen born-to-be-a-soldier from the space-faring decedents of an abandoned Earth, crash landing back on the now-mythical planet, only to find a flourishing society of people still living there and scavenging off the submerged remains of old cities.
I'm about half way through, and it's managed to be completely enjoyable without insulting my intelligence yet.
But ... the main 2 characters are teen aged ... so that misses your criteria, too (although there's a sizable cast of adults in there, as well).
So, really ... "no", I can't think of anything that actually fits 100% within your criteria ... but I did get to mention a couple of shows that I like that don't seem to have been mentioned, yet.