There may be gamers out there who are fans of the Shin Megami Tensei series and not even know it. If gamers have played the Persona series or Tokyo Mirage Sessions, then they've played the Shin Megami Tensei series and would likely appreciate Shin Megami Tensei 3 HD and the new trailer that Atlus just dropped.
The trailer doesn't get too specific as to the plot of the game, but it does show off some elements fans of either Shin Megami Tensei and Persona will recognize, such as the various demons. What the Persona series calls personas, the Shin Megami Tensei series calls demons. While some creatures get redesigns from game to game, there are a lot of them that look the same in Persona that they do in Shin Megami Tensei. For example, the trailer shows both Beezlebub and Forneus who have the same appearance as they do in Persona 5.
What the trailer does indicate about the story has to do with the main character, the demi-fiend, and the destruction of the world. A central theme in all the main Shin Megami Tensei games is chaos vs order, typically with forces representing the Judeo-Christian version of Lucifer representing chaos and the forces of God representing order.
The player will be able to decide which side of this spectrum they will want to align themselves with. Therefore, mainline Shin Megami Tensei games have different valid endings, unlike Persona which typically has good and bad endings.
Regardless, of the plot differences, players can still expect to collect a wide variety of different creatures and take them into battle. Exploiting elemental weaknesses is still a thing that needs to be taken into account as well. Persona 5 players will be familiar with the method of recruiting demons as the persona recruitment feature from that game was taken from the mainline games.
Shin Megami Tensei 3: Nocturne HD Remaster will release on PC, Switch, and PS4 on May 25th, 2021.