While I was developing Toire No Hanako, I made a big research on geography and culture of the island of Hokkaido and its biggest cities (one of the main characters in the story, Reiko, was born and raised in Hakodate, before moving to Sapporo).
But hey, why a self-proclaimed non-otaku like me decided to create yet another japanese hi-school drama on his first experience as a VN creator? Well, mainly as a tribute to some friends. Yes, here in Brazil Japanese descendants are everywhere.
In fact the largest population of Japanese origin, living outside Japan, is in Brazil. You can read about this here: http://www.tofugu.com/2011/11/08/japanese-brazil/
Curiously, talk about Brazil to a japanese, and he will instantly think about Bossa Nova, Samba, Coffee, Pelé. Brazilian culture, especially music, can also have some impact in Japan.
In the Internet, it's not difficult to find such things like this Japanese group which tries to mimic Brazilian music (Brazilian flags on their instruments, and all). The lyrics are in Portuguese (or something that sounds like Portuguese). And no, you won't find a banjo player in a genuine Brazilian group
