Shin Megami Tensei IV is a Japanese post-apocalyptic role-playing video game developed by Atlus for the Nintendo 3DS. It is part of the Shin Megami Tensei series, the central series of the Megami Tensei franchise, though no direct story connection exists to previous entries. The gameplay is reminiscent of previous Shin Megami Tensei games, carrying over the turn-based Press Turn battle system, where players and enemies fight and exploit weaknesses, allowing either side to gain additional turns or lose them.

The story focuses on Flynn, a samurai who protects the medieval Kingdom of Mikado from attacks by hostile demons. When a mysterious Black Samurai begins transforming the population into demons, Flynn and three companions are sent to capture her. The pursuit of the Black Samurai drags Flynn and his comrades into a startling revelation and a power struggle between angelic and demonic forces.