The term you're looking for is "Main Line SMT".
"Real" is a poor term to use, as Persona 5 is still a "Real" SMT game, since it's based on the spinoff series, much like Devil Survivor is a "Real" SMT game.
I've given most of them a run, and have not actually beaten any of the main line games due to the unnecessary difficulty, but the closest I'd get to your definition of "Real" would be Megaten Online. Love that one to death, even if it is just an MMO.