Because what people basically answer when I tell them I'm going to work in Japan is "Japan? But that's quite far away, isn't it?", and there's really not much you can come up with when faced with such a truthful, yet useless comment. What do you answer to such a statement? "Yes, it is" seems a bit silly, because everyone knows that already. "Yeah, well, but you know, nowadays with smartphones and computers it barely seems so..." and then the conversation kind of awkwardly dies out.
So let me explain to all of you how come I've ended up here, and why I wanted to do so in the first place.