For those that played Sailor Moon beat em ups (even the arcade game) and felt like they should have supported 4 players co-op instead of just 2 players, here is Sailor Moon R Plus:
http://destinyrevival.sailormoon.cc/gamesWhile the graphics and gameplay use the SNES version instead of the arcade version, it has a bunch of things even the SNES games didn't have. And really proves "the more the merrier" when it comes to co-op.
It's really easy to launch, customize and play (though 2p is default, in options you can set it to 4p.)
I applaud their efforts making this 4 players Sailor Moon masterpiece!! ^_^