Well, a little late, but here's a fix for Yatagarasu:
1. Download "Locale Remulator" (If you search in google, it's the first and second pages). Read in the page if you need to download other support files (.Net, Vc, Directx...)
2. Install it
3. Right click on "game.exe" or "NESICA_Unlocker"
4. On the Tab "Locale Remulator X64", click on "Run in Japanese"
Voila! You can even make a shortcut if you choose "Edit profile list".
Alternatively, if you want to make it portable, copy all the content from the Locale Remulator install folder into the game folder and then make a bat or AHK file to launch it.
Ok I added also a few examples of bat and AHK files for you to download.
Btw. "Locale Remulator", unlike the other similar program "Locale Emulator", can also be used in 64bit games.
Enjoy 🙂
Yatagarasu_AHKandBAt.zip