I think that it's going to be interesting where japan goes with their monetary policy. There is an argument to be made that it's possible that japan will be one of the next few countries to adopt bitcoin.

While cash is undoubtedly still king in japan, it's becoming extremely normal for people of all ages to use different payment services, including multiple services at the same time.

Suica, passmo, etc which were initially only used for train fares are accepted at more an more stores.

Rakuten pay, dHarau, Line Pay, Pay Pay and many others are everywhere and are used a ton.

Also, bitcoin itself is becoming more acceptable (but not nearly widespread), one of the biggest technology retailers, Bic Camera has been accepting bitcoin payments for a long time (I think 2017, but don't quote me on the exact year), both online an offline. Recently we're also seeing a huge push from mercari (ecommerce site similar to amazon or ebay) to accept bitcoin (and sadly web3, but hey, still progress).

It's not commonplace YET to use bitcoin, but with the value of 10 sats being roughly 1 yen, people using more and more payment systems regularly, the widespread usage of point cards, people not being afraid to try new payment systems, the already existing and growing infrastructure for bitcoin, the upcoming monetary changes, the more well defined regulation (which to be clear isn't perfect for us bitcoin maxis, but at least unlike the us it's well defined) and naturally me hopefully moving there very soon (😛) I can see japan's adoption of bitcoin growing substantially in the next few years