[s]I'm probably the only person that though of a 'gun' when you mentioned 'Tanegashima' xD[/s]
Have to admit that the alternate history is pretty interesting, though I do question relevance a bit, I was sort of expecting Russian Experiments to be a factor, but guess not.

Bit disappointed in the location too since I always look forward to changing seasons in RP's. Snowy Winters and golden red leaves of Autumn etc. Not too familiar but considering southern Kyushu's climate I'd guess snow would be unlikely (it's basically tropical island) and the scenery would be pretty constant throughout the year.

... Bleh I feel like I'm just being a hater now >_<
Pending involvement in this RP since I might be starting my own (depends on numbers). 
But you've got my subscription for the time being :P