State of the Nation, 1699 to 1799
So here we are after 400 years of gameplay and only 21 to go before the end. Japan has come a long way from (relatively) humble beginnings, but so far I think I've managed to stick to my goals of plausible expansion and a technological focus.
Some of you have mentioned the possibility of taking this game into Victoria II. I must admit it's crossed my mind more than once, and for that reason I've taken care not to destroy too many nations that could provide a decent challenge. That said, it'll be a lot of work converting this game into V2 in a way that catches its unique quirks. It is on my long-range to do list though!
This has been a very satisfying century to play. Japan started it off in the Chinese tech group and finishes not only fully westernised but also a world leader! I've tried to capture the flavour of what that would have been like from a cultural point of view, but I can't really do it justice.
I've also run out of ambitions for the final portion of the game. Japan's got obligations to her allies that will be honoured, but I'm not really in the mood for more war, and after Higashiyama's adventures nor are the Japanese people. On the plus side this probably means I can wrap up fairly quickly and start mucking around to convert the save.
Economy
Number of provinces: 90 (78 in 1699; 45 in 1599; 31 in 1499; 19 in 1399)
Annual Census Tax: 1558.08 (1167.39 in 1699; 387.15 in 1599; 146.86 in 1499; 69.69 in 1399)Per province: 17.31 (14.97 in 1699; 8.60 in 1599; 4.74 in 1499; 3.67 in 1399)
As you'll note from the above and the screenshot below Japan is filthly rich! Expansion has slowed as most of the additions are from colonies now rather than conquest. We will pick up Moulmein at the end of the Great Austrian War, but hopefully I'll be able to get rid of it in short order. Perhaps I should give it back to Scotland, who once held it.
Per province income is slightly up from 1699, which is a nice bonus. Wasn't sure that would happen what with all the colonising, but I suppose the core of the empire is getting richer all the time. This figure was once of great concern to me as it governed the tech rate, but we're so far advanced now that I'm relaxed about.
I had considered releasing Korea as most of their provinces are poor and it seemed in character for Higashiyama, but the option doesn't show up, so I'm stuck with it for now. Might release them in the conversion to Victoria II.

Japan is 50% richer than giant!France, almost twice as well of as Russia and far ahead of everyone else. We've also managed to avoid crazy inflation.
Technology

Monthly investment: 833.6 (275.8 in 1699; 98.6 in 1599; 40.0 in 1499; 20.6 in 1399)Per province: 9.26 (3.54 in 1699; 2.19 in 1599; 1.29 in 1499; 1.08 in 1399)
Here's where it gets interesting. For some reason my monthly investment has skyrocketed from 275 to over 800 ducats a month! As a result, my tech rate has drastically improved to the point where I'm ahead of the game. Some of the things I pulled recently, such as declaring war without a CB and switching National Ideas were done because not only is stability cheap, but it's kinda pointless to keep pouring money into research due to the ahead of time penalties. I'm currently doing just that, but only because there isn't much else to do.

All the world bows before Japan's technological might! I'm number one across the board, including beating out those pesky OPM traders! Nice to see Colombia doing well in this list as they're fun in Vicky 2.
Military
Army size: 174/239 (94/148 in 1699; 65/109 in 1599; 32/45 in 1499; 6/28 in 1399)Army upkeep: 63.6 ducats/month (33.2 ducats/month in 1699; 19.1 ducats/month in 1599; 9.1 ducats/month in 1499; 1.3 ducats/month in 1399)
Manpower: 139,000 (108,000 in 1699; 75,922 in 1599; 33,498 in 1499; 15,274 in 1399)
The army size has grown quickly as a result of all the recent wars and now costs nearly twice what it did a century ago. Despite this, I never have as many troops as I'd like, which I suppose is realistic enough.
Navy size: 171/85 (74/69 in 1699; 68/81 in 1599; 45/52 in 1499; 37/44 in 1399)Navy upkeep: 20.9 ducats/month (3.8 ducats/month in 1699; 3.5 ducats/month in 1599; 2.4 ducats/month in 1499; 1.5 ducats/month in 1399)
Navally I think I've gone a bit overboard (groan
). I'm now way beyond my force limit and spending over five times what I was 100 years ago. I guess a colonial interventionist power does need a navy after all.
Armed forces comparison: 1699

Armed forces comparison: 1799

Progress has been steady compared to my competitors, but of particular note is the plight of Austria. As of this screenshot we're still at war and they've been reduced to a mere 5,000 men and less than 9,000 manpower. I bet they're regretting their random colonial aggression now!
Home affairs

Not a great deal to say here, except to note that we no longer have any rivals or threats on the board. We've also become a constitutional monarchy, partly because I'm a bleeding heart liberal and partly because it lets me drop a prestige adviser for someone else. Haven't got around to doing that yet.
Also of note is our small list of best friends, many of whom I've released from oppression. Go Japan!
The Court

Where was Emperor Kashiwabara when I was waiting for a decent admin ruler? Nevermind, he's here now. Of greater interest is his heir. Koko is, I believe, a female name, so Japan's about to get its first Empress. That seems to tie in pretty well with the shift to constitutional monarchy. Stats wise the Empress-designate isn't that bad either, and a better soldier than her dad.
If she does live to inherit, I'll lobby to have Vicky 2 renamed in her honour.

Slider wise we're nearly there. I think I've only got two more moves before the end of the game. One will be to max centralisation, then the other to get a wee bit more free trade-y. That's more a flavour thing than anything else, as it's far too late to matter.
All the national ideas are locked in, although I could easily ditch QFTNW as there's not much more for explorers to do. There's not much I'd want to replace it with though.
Cabinet was another flavour decision. I'm not planning on racking up the infamy, but I thought it went well with constitutional monarchy.

The pies show that Japanese has once again become the largest culture in the empire thanks to the colonisation programme. Apart from that, not much of a change on 1699.
World affairs
And here's Japan's empire and the rest of the world. In fun news, Trebizond has moved its capital to the new world, joining Britain and Aragon as exiles from Europe. France and Castille are also major colonisers, while Russia is slowly expanding eastwards.
Japan in 1799

Asia in 1799

Europe and Africa in 1799

The Americas in 1799