I crash unless I start it in
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. I never swapped to proper Japanese locale. It's a pain in the ass for some stuff, like when all your backslashes are yen in terminal. Locale Emulator has served me well with games like this. The game also uses the fonts: 游ゴシック (Yu Gothic) and MS ゴシック (MS Gothic). I also run it in admin via the locale emulator (it is in my right click menu for files). Once you crash, the program will ask you if you want to change your settings on the next launch. If all you see is a bunch of gibberish and no Japanese, you done goofed and it never was in Japanese locale to begin with. I am 99% certain that it's a font and a locale issue. If it was related to libraries, the game would not boot at all. Anyhow, I took >> [
these fonts] << out of my own system. See how it goes afterwards. Also added Meiryo in case someone revisits this after 10 years.
Alternatively for file changes, slap this attachment file into C:\Users\your_accout_name\AppData\Local\Eushully\天結いキャッスルマイスター\SAVE
To get there use windows key + r for run and type %appdata% and launch it to get to Appdata/Roaming, then go 1 directory backwards and enter Local. There's the Eushully folder and the moon rune folder(s) in which the SAVE folder is located. The legit one is in Japanese, the failed monstrosity is what happens when a non-western game is launched and it tries to create directories without language support. There are the settings. I've swapped the fonts to MS UI Gothic. Might look awful, possibly, but you should have this font by default no matter what kind of a Russian bootleg kellogs cornflakes freeware windows edition you are on. (And if not, it's fairly easy to get since you can actually type it with a western keyboard. It's included in the mega link as well.)
Use Locale Emulator in any case. Yes they tell you not to use it all around, but that's old news and directed at the built-in windows locale emu. It fixes some spacing issues and the game outputs stuff with right names into right directories. I do not use Japanese windows locale. Ever. And I've been in this weeb game stuff for 11 years. Got a weeb game, run installer via locale emu in Japanese in admin. Then run the executables with locale emu as well. File structure is retained and you get no weird errors. This game has no installer, but you need to have the same locale it has been installed and natively runs in.
TL;DR need fast solution - download the mega link, and locale emulator and run the exe in locale emulator in Japanese locale, ignore the rest.