But after that, it may appear the error of "This product is only for the inside of Japan".
If happens, it's kind of a pain to bypass that window. It's necessary doing some things to make the game thinks we are a japanese user:
1.- Change the default keyboard to Japanese.
2.- Change the time zone to UTC+9.
3.- Run the game exe with NTLEA. In case you don't know is a program similar to applocale or locale emulator (I tried applocale but didn't work).
I used an old version of NTLEA (0.86) but it worked for me, here is if you want it https://t1.daumcdn.net/cfile/tistory/193410254A4F148438
Will look like a file without extension, just rename it to .rar and you can extract it.
After doing that if the game window doesn't appear, try to run the "Execle.exe" with NTLEA too.