I don't see it in the menu with "Start", "Load", etc. I tried cracking open the PC ZIP file and I can see the graphics files for the new elephant character in there. When I do the same with the Mac version, those files are missing. I suspect the Mac bundle is just the previous version.
Viewing post in Clawstar Wrestling Update - v1.1.0 comments
Alright that's weird. It definitely says v1.0 in my version. So I re-downloaded it and now it says v1.1.0 and the side story shows up properly. I'm really sorry if this is my mistake! I swear this is the first time I've downloaded the game and so I don't know how I confused myself this badly. :D Thanks so much for your help, though, this is perfect!