Hyakujitsu no Bara/Fridge

• Fridge Logic:
  • Berkut is called Berkut-sama by an Eurotean man. But why? Everyone (except Klaus) calling Taki Taki-sama makes sense since they live in a Japan-like country with Japanese names and everything, but isn't where Berkut comes from a place more like Germany with all the Gratuitous German? Shouldn't he be called Herr Berkut (even Lord Berkut or anything not so uniquely Japanese) or something like that? Even if Berkut is not from the same country as Klaus (the geography of this world can be a little confusing sometimes), he sure isn't from Taki's land.