Megami Tensei II is set in a post-apocalyptic world where an atomic explosion has caused widespread destruction and opened the way for a demonic invasion. The demons are ravaging the planet, leaving it in ruins. You control a group known as Devil Busters, tasked with preventing the demonic minions and their evil lord from dominating the entire world.
The gameplay involves creating a party and allocating skill points to upgrade your characters' attributes. As you level up, you can distribute the gained points as desired. When encountering hostile creatures, you have the option to talk them out of battle or convince a demon to fight for you. The game features both top-down and first-person perspectives, with the latter applied in dungeons and battles.