Abysskeeper Suen is set in a small coastal town called Tidescreep in the year 1872, the climate is similar to the Northeastern US, but due to not actually taking place on the earth we ended up with, it definitely isn’t actually located there.
The worldbuilding of the story is heavily inspired by Shadow over Innsmouth, the eponymous town being located in Massachusetts if memory serves correctly, so it only felt fitting to base the setting on that area. Time-wise, I chose 1872 pretty randomly, and on accident. I knew I wanted it to be in the mid to late 19th century, so I decided it would be 1874, but an important moment for a major character happened in 1842, and I got the numbers slightly mixed up.
Plus, I haven’t ever seen a historical magical girl story (closest I’ve come across is Elsie, which is historical superheroes), so it’s not exactly a cliche setting.
