Have you reached out to the ones who are trying to do btc things in Japan to see if they could jumpstart some connections for you? Nicolas Doirier (btcpayserver), the diamond hands guys, the ones who organized the bitcoin tokyo, etc?

A bitcoiner friend of mine will be moving to Japan and we're hoping for as much btc-living as possible.

Can you speak a little bit of Japanese?

I moved to an area (different country) where basically no one was using it (and most were pretty against it). After a while, everybody I interact with is using it and I can live on it for a good part.