Can't launch the game

The solution is getting alphabet windows user name.
You have 2 ways.

Adding new windows account (Recommended)

  1. Add new windows account with alphabet user name.
    (You may need get administrative privileges or something for new account)
    (That’s simple but I did another way)

Using Symbolic link (Caution! You may break PC with wrong way!)

  1. Add Symbolic link of user folder by command prompt
    [mklink c:\Users\alphabetusername /D c:\Users\ゲスト]
    (mklink Newer name /D old name)

  2. Change the directory name by regedit
    go to[computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList]
    find and click “ProfileImagePath(c:\Users\ゲスト)”
    (it’s in a folder of ProfileList. Not “ProfileImagePath(%systemdrive%…)”)
    and change to the new link (c:\Users\alphabetusername)

I refer to this Japanese professor’s introduction (from p18). It’s better for you to refer to another clear introduction too.