[After a little thought, she supposes most of it is common knowledge given the way Acumen addresses her. She just doesn't really want to talk about Japan.]
Most people find out these kinds of things anyway, so it isn't really worth hiding...
My name is Nunnally vi Britannia. My brother is the emperor of Britannia, but I don't think it's a country most of the other Earths people here come from have. I'm human and female. [Well obviously, but if she's going to avoid some questions it's only polite to answer the others.]