This mod gives you the option to roam around the map without having a partner around. This affects both overworld and battle gameplay.
To enable its features, enter Gramophone Café and interact with the vase to the east of the gramophone. To resume back to normal, simply invite any partner. This is available very early on in the game, allowing you to do a no partners challenge as soon as you get through the tutorial Traffikrab fight.
While this mod's features are activated, you can only carry up to 5 tapes. This mod also tries to prevent access to Archangels related to partners if you haven't completed their quest yet. You can, however, fix quests and relationship levels by interacting with the vase and choosing to fix relationship levels.
This mod does not tag netplay and should be safe to remove, but just in case, backup your saves and ensure you have a partner with you before closing and removing the mod.