I've known about this game since 2003 or 2004 or so, and it still hasn't been translated! So, sometimes if you wanna get something done, you gotta do it yourself, right?

(I'd tried it back then, too, but it was too difficult at the time. Now I'm a better hacker and we have better tools. Also, back then my Japanese skills couldn't even qualify for Japanese 101; now I'm experienced enough to handle most of it myself.)
Sample screens:

(EDIT: I can now get two more chars per line than before, so "surprise" no longer needs to be hyphenated, but I'm too lazy to update the screenshot.)
I expect it to take a couple weeks before I'm done. Maybe sooner, but I'll say a couple of weeks to be safe. Most of what's left on the hacking side is mildly annoying stuff like the title logo and the options screen -- nothing too severe, it just takes time to work with.