The correct answer is Lucky Pierrot but since it's not nationwide , Freshness has to do
No doubt, the Chinese Chicken Burger and a cup of fries (plus those cheap beer mugs) are one of the few highlights of Hakodate. I'm actually headed back there again this month, most likely. I always try to incorporate LP into my day, no matter what. Wake up in the early AM, go for an hour jog on the pier, catch a tiny breakfast at the hotel buffet, soak in the rooftop rotenburo, hit Asaichi for king crab and beer after the breakfast rush when all the fucking tourists are gone, go wandering around town for a couple hours chugging Sapporo Classic at every stop and buying snacks then hit LP in the afternoon before the dinner crowd. Usually finish off my night with a good shio ramen, one more drunken trip to the bath and then it's lights-out by 9pm. I'm getting fucking old.
As for the chains...
In all my years there, I never ate once at Lotteria. Something about it is just unappealing.
Had no idea BK was in Japan, and wouldn't eat there even if I knew. Things that can happen when you're gone 15 years.
I always had a soft spot for the teri-burger at Mos, especially since we used to have it in my hometown when I was in elementary school and there was a shop around the corner from my first NOVA 1k flat.
I avoid McDonald's just out of principle.
Freshness was always a very decent burger, although a bit pricey compared to the rest...at least to 24yo me, 20 years ago. IIRC, they had pretty great onion rings for a chain shop. I remember there was a Freshness right across the street from the old Osaka immigration bureau, so after every time I'd have to stand in line for two hours amongst a sea of third-world savages just to get my fucking re-entry pass I'd reward myself with a burger and onion rings for being so polite about it.
For fifteen years I've been coming back to Japan to visit and every time I do I promise myself I'll go grab a burger at MOS or Freshness. For whatever reason, I never get around to it.