Sure thing, have fun with your game bro, no hard feelings. But just for the record you haven't actually argued anything. You've said "but this anime I saw means this has to be this way" and completely refused to acknowledge any criticism, whether basis and reasonings were given or not, and that's 5 different people now (counting myself) who have been interested in your game but have pointed out that yeah this one little detail doesn't make a lot of sense and would be very easy to change.

The only difference being I've actually tried to engage you as a person by providing my line of reasoning and allowing for actual counterarguments or something as simple as detailing how these magical europeans conquered the Japanese underworld with their superior magics or something, you know basic world building so you have more than a loose idea. But I guess we can't have that.