The major part of the story will be taking place in Yoshino’s world. The relm which this place is called is Koukai, or The Ancient World.
Koukai looks remarkably similar to Japan’s Heien era with the samurai/ronin rule of the Sengoku Jidai. This is because the Kakkai around Japan is directly over Koukai, which ancient Japan probaly infulenced the culture in Koukai.
Koukai is ruled much the same way Feudal Lords and Damiyo did back in the day, but one major difference: “The power of Feudal Lords are based on the strength of their samurai and beastial armies they controlled…” The beasts are demons, spirits & mythical creatures. Dragons and Gods are not involved with the humans political matters.