* Confirm system compatibility via the trial version.
(Especially on Windows 10 which is NOT officially supported)
If you experience trouble, confirm the following points:
1. System Locale is set to Japanese.
2. DirectX 9.0c and the latest version of DirectX is installed.
3. Flash adobe player is installed. Requires Adobe Projector.
4. Codec packs for video playback are installed.
5. User Authentication software is correctly installed.
(
http://www.dlsite.com/eng/guide/dlviewer )
6. You have Administrator Privileges for your PC.
7. The game is installed directly in your root drive (C:)
8. Screen capture / recording software is NOT running.
9. DEP, anti-virus and security software is NOT interfering.
10. AND of course, that you have tried RESTARTING your PC.