[uhartelightning]

There was a lot of Japanese immigration to Brazil, and recently there has been a movement of their descendants "returning" to Japan. These descendants are 2nd-4th generation Brazilians and often only speak Portuguese, resulting in the signs you mention in Japan.

[Grustaf]

I always imagined it was related to Portuguese adventures to Formosa and perhaps beyond, to Japan. But I did have lunch at a Japanese-Brasilian's house this weekend...