The ancient power struggle between gods and demons spans generations as well as countries. Proof: Atlus' Shin Megami Tensei IV: Final is coming to North America this summer as Shin Megami Tensei IV: Apocalypse.
First released for Japanese Nintendo 3DS systems last February, Shin Megami Tensei IV: Apocalypse overlaps the story set in Shin Megami Tensei IV. This time, you're a Hunter cadet who's offed in post-apocalyptic Tokyo by one of the demons chilling in the infested city. You're subsequently resurrected by the god Dagda, and bound to serve him. Thing is, it's not initially clear if Dagda is a vengeful god or a happy god.
Hence why the themes in Shin Megami Tensei IV: Apocalypse tread the line between good and evil. You can choose to act peacefully, or break loose and commit anarchy. As is typical for the Shin Megami Tensei series, you can also recruit demons to fight for you. Apocalypse also has a revamped demon fusion system that takes advantage of the demons' skill affinities.
If you've yet to play Shin Megami Tensei IV, don't fear the Apocalypse. It's a stand-alone adventure, making it a decent jumping-in point for the Nintendo 3DS chapter of Atlus' long-running RPG series. Physical and digital copies will be available in the summer for $49.99 USD.
Incidentally, are you interested in the reason why "Final" became "Apocalypse?" Atlus posted a piece that offers some cool insight into Shin Megami Tensei's localization process.