Hi!
Today another player reported this issue. The problem was that the mac version is sometimes missing vital files to run the game.
Could you please check if you have this file in your folder?
Afterlife_Harem.app->Contents->Resources->autorun->game->scripys.rpa
One solution could be freeing space in you computer.
Another solution could be to try downloading the game from the mirror version.
And finally, feel free to contact me on discord so I can send you those files myself.