Megami Tensei is a popular series of role-playing video games developed by Atlus. The franchise is known for its unique blend of traditional RPG elements with themes of mythology, philosophy, and morality. Players often assume the role of a protagonist who can summon and negotiate with various demons to aid them in battles. The series features turn-based combat and a deep narrative that often explores the consequences of choices made by the player. Each game typically presents a different setting, ranging from post-apocalyptic worlds to modern-day Tokyo, while maintaining core gameplay mechanics and the overarching theme of demon summoning and fusion.