Wait are we actually on another version of Earth where magic exists? Furthermore, apparently we have fully structured and operational skyscrapers, where are the early versions of computers? What is the current geopolitical situation? Is this post WWII? What is the magical equivalent of a nuclear bomb? How are we in an age with skyscrapers yet simultaneous retain a aristocracy? Did WWI never occur then?
Author you can drop in fantasy not-Japan, but if actual Japan exists then this entire stories cohesiveness will dissolve away.
Wait this is even worse, how did the nation of Japan survive the demon outbreaks from the past? How did other countries form during the demon outbreaks? We literally had only 200 years of development since demons were ravaging the entire continent, how did we make it to late 1800s technology in that span of time? That would mean that, at the earliest, the last demon outbreak was in 1685, yet we currently have skyscrapers, arcades and swimsuits.
Does Jesus exist in this world? Was he not important because everyone could perform magic? What about Buddha?
God I can just not wrap my head around what the fuck this author is doing.