README wrote...
-Intructions to boot the game in foreign languages-
To make the languages in-game appears properly, the computer OS has to be set in the same language.
For instance, if the OS is set in Japanese, the accents on French characters will not appear.
If the OS is set in English, all the Japanese characters will appear as question marks.
We strongly recommend to set your OS in the proper language (in "Changing Language for non-Unicode Programs†Ž") before launching the game.
-IMPORTANT-
Therefore, if the OS is set in a language other than Japanese, the game may not boot using the Japanese exe file.
In that case, please use the application Koumajou.exe (C:\Program Files\Frontier Aja\ç´…é”城ä¼èª¬ 緋色ã®äº¤éŸ¿æ›²\Koumajou.exe") to launch the game. Finally you need to RENAME the FOLDER (ç´…é”城ä¼èª¬ 緋色ã®äº¤éŸ¿æ›²) in alphabet ("Koumajou Densetsu" for example).
Touche, there is no troubleshooting.
How about config.exe ? Have try to change some option ? like Vsync or whatever else ?