SMT is a subseries of Megami Tensei, although with the way Atlus marketed them abroad, people forgot there was a difference, lol.
Basically, most of those games are like Pokemon for grown-ups, I guess? The central gimmick to them is that you can talk to your enemy rather than kill them. Doing so can convince them to give you money, items, or to join your team. The problem is that a lot of those conversations are RNG-based and can go seriously wrong at times, making the enemy call in multiple waves of reinforcements and shit. Also, certain bosses, like the Matador and Minotaur, are infamously hard.
Basically, most of those games are like Pokemon for grown-ups, I guess? The central gimmick to them is that you can talk to your enemy rather than kill them. Doing so can convince them to give you money, items, or to join your team. The problem is that a lot of those conversations are RNG-based and can go seriously wrong at times, making the enemy call in multiple waves of reinforcements and shit. Also, certain bosses, like the Matador and Minotaur, are infamously hard.