FOMO shouldn't just be viewed as desperate and sudden thing. Some investors (especially in Japan where some are more tech-savvy) are starting to realise that Bitcoin has a big future, as an asset or a currency or for wider applications or really anything else, and they're flowing in knowing that this will be a low price in a few years' time.
lets not forget that Japan was the land of Mt Gox and they took a big hit after the big scam and they were out of the game for a long time. and now they are coming back, with a lot more faith and surprisingly with an open arms.
and we won't probably see their effect this soon but it is there and there will be a solid rise in real demand for bitcoin as new people with new money come in.
and lets not forget that Japan will soon host the Olympics games and that will be a huge publicity to the whole world as people go there with their foreign money and "Bitcoin is accepted here" signs will be everywhere and easy for them to just use bitcoin instead of exchanging their money.
I doubt if "Bitcoin is accepted here" signs are ubiquitous enough for foreign tourists to use them. But if it does happen, especially before a big event like the Olympics, it could provide a big boost for Bitcoin. Of course, it depends on merchants not short-changing bitcoin users - i.e. not charging higher prices in bitcoins when compared to yen.