I'm extremely happy that SideM is getting a rhythm game! I expected Million Live to get one first so this is a very neat surprise. As much as I love Million Live and its songs, I love SideM even more.
Hopefully we find see some pictures, videos, and more info in the coming months! The trailer doesn't even specify if it's a rhythm game so Scamco really wants to keep 99% of LIVE ON ST@GE a secret I suppose.