In Persona 4 and 5, in dungeons, there is a way to call for an SOS. I often do it by accident. (it's mapped to Start and I can't seem to program my brain to not think its the open menu to heal option)
It is explained as 'getting help from other players via the internet'. I also sometimes get calls to help someone else.
But really, I can't seem to figure out what it does in reality, and what I get from helping others?
So in the Persona help mechanic, what does the mechanic do for the player that is helped, and what reward is there for the helper?