I've tried three different installs and can't seem to get Ongeki to even start booting.
The 1.39 pack launches a CMD window and a game window, but the game window is black and the CMD window just has a flashing cursor.
The 1.40 pack doesn't even get a game window and just gives me the error "mu3hook.dll: DLL failed to load inside target process" before terminating in CMD.
I also combined the packages for 1.35-1.39 from the Pixeldrain archive and followed the SEGAguide, but that gave me the same error as the 1.40 pack.
Update: Using the mu3hook.dll for the ontroller allows it to get further, but breaks since I don't actually have an ontroller
Update 2:
After hours of troubleshooting, I've finally made progress.
Getting the game to start booting and get past the black screen required installing a vcredist AIO from https://github.com/abbodi1406/vcredist
Getting past the game initializing prompt required installing DirectX End-User runtimes from https://www.microsoft.com/en-gb/download/details.aspx?id=35
I now have some networking errors to work out, but the game did boot to the title screen.