I like the fantasy world interacting with the Japanese is already well formed and has ways of dealing with them without being completely overawed and intimidated.
Imperial Japan returnin to the Banzai period in the new world.
Taste the glorious nippon blade and kamikaze castle-busting strategies to rule over a new world's pacific!
I'm surprised Japan didn't immediately declare war on the planet. Yeah I know they're not the same Japan as WW2, but I have to think that a pre-industrial era resource heavy world without technology would be a huge temptation for any country with a strong enough military.
Yeah. Peaceful culture, my ass. They committed so many crimes against humanity during WWII that Korea, China, and some neighbor countries still hate their guts lol