Game can be run on Windows 11 or lower here is the whole process step-by-step -

Important: This method needs to be followed correctly on the first attempt. If it doesn't work, uninstall the game completely and reinstall it before trying again.

Note: Before installing the game, it is recommended to change your PC's system language to Japanese and set the Region and Time Zone to Japan. Otherwise, you may not be able to read the Japanese error messages, even if you use Locale Emulator.

Step 1: Install the Game

1. Mount the game's ISO/disc image using a tool such as Daemon Tools Lite.
2. Install the game normally.

Step 2: Start the Game

1. After installation is complete, unmount the ISO/disc.
2. Run FUTAYOME.exe.

Step 3: Verify the Installation

If the game was installed correctly:

• A window will appear asking you to enter a Serial ID.
• Check the title displayed in the top-left corner of the window.
  • If your system language is set to Japanese, it should display ふたりの兄嫁
  • If it shows garbled or incorrect text, the installation or locale settings may not be correct. You can still continue if you want its not going to cause a problem i think.

Step 4: Enter the Serial ID

Enter the following Serial ID:

DJ2Y-S2WD-7VCH-3NWZ

Click OK.

Step 5: Two Pop-ups will appear

1. A Japanese pop-up will appear indicating that the Serial ID is valid and that the game needs to read the disc.
2. After closing it, another Japanese pop-up will ask you to insert the game disc (ISO).

Step 6: Mount the ISO Again

1. Mount the ISO/disc again.
2. Click Yes on the prompt repeatedly until it disappears.
3. As soon as the prompt disappears, quickly click the X button in the top-right corner of the game window and choose Yes to close the program.

Step 7: Delete the FA-READ.dat File

1. Open the game's installation folder.
2. Delete the file named FA-READ.dat.
3. Launch the game again.

Step 8: Play the Game

1. Enter the same Serial ID once more.
2. The game should now start normally.

Enjoy the game!