Then commonly Misogi with his own blood. If one made his Misogi with enemy's , he'll be tried criminal and judgement in consioderation of that. Some of thease virtues came from old China, but they are well developped in Japan. Who govern Japan is authorized by Mikado. With force or with election, who get the post of governer can't hold it without Mikado's authorization.
Mikado is only family rule the Japan.
Metahumans Metahumans especially orks and trolls were enemy of human in ancient days. Then it's disagreeable to live with them. It's bad to allow them behave along their nature. Modern education make most of their harmfull nature beyond controll. Elves and Dwarves are not so harmful as Orks and Trolls, but not all their interests are coincident with humans.