Shin Megami Tensei IV is a role-playing video game developed by ATLUS. It is the first true successor to 2004's Shin Megami Tensei: Nocturne, and builds on the styles of previous titles such as Persona, Devil Summoner and Devil Survivor. The story revolves around the Samurai, who are sacred protectors of the Eastern Kingdom of Mikado. Players take on the role of a newly appointed Samurai, who must defend their kingdom from an army of demons while struggling against factions that have nefarious designs on the world. Throughout the course of their journey they will be faced with many choices which will affect how events unfold; ultimately leading to either salvation or destruction for mankind.