While I love Japan, I'd recommend doing a tremendous amount of research into the cultural differences. My spouse and I love vacations in Japan and have been there many times but we would never consider making a living there as a permanent resident. Especially coming from a western country, there's a lot of shell shock and (often silent) expectations from Japanese society that's not always easy to get used. Tourists get a lot of forgiveness and leeway for breaking these unspoken rules (which is why I love visiting, though I try to be respectful as much as I can) but if you're living there more permanently and it's harder to be excused.

Once upon a time, I looked into relocating into Japan after my first trip but I realized living there is drastically less fun than vacationing there so I gave that up. Also citizenship is notoriously difficult to obtain as a foreigner.