I tried using Joiplay but everytime I try using it, Online Obsession doesnt open but brings me back to Joiplay. I even compressed a file and tried it but did the same. I dont know if it supports Joiplay. Its kinda hard finding a yandere game that will work on Joiplay :(

Here from the future ✨ /j

On serious note, apparently you need to download other ren'py plugin versions, it happened to me when i downloaded the game and i figured it might have something to do with the compatibility of it because it didn't work for me and when i started to download other ren'py plugin versions, it worked.

You have to get them through official JoiPlay Patreon and scroll down the post (the free one where you can download JoiPlay safely) where you can spot "Optional Ren'Py plugins for better compatibility". See if any version of it works because it did for me.