Either way you gotta be fluent in Japanese and know the history.
Just stepping into my seventh year here... Can't remember from the top of my head, and I'm even too lazy to follow the relevant links that I, myself, provided somewhere back in this tread, but I can't seem to recall any reference to (Japanese) history. As for the language skills, it was something like mastering kanji at a second grade elementary school levels or so, though I might be wrong here too.
Anyway, in normal cases, eligibility for Japanese citizenship doesn't come until you've been a PR Visa holder for a minimum of five years; and you don't get that changed from a spouse visa - again, in normal cases - earlier than in a couple of years.
Now, if I was a valuable football player and they really, really wanted me on their national team, the law is provided with shortcuts for this special occurrences, isn't it?
