Shin Megami Tensei: Digital Devil Saga (Digital Devil Saga アバタール・チューナー Dejitaru Debiru Sāga Abatāru Chūnā, "Digital Devil Saga - Avatar Tuner") is a PlayStation 2 role-playing game. It is a spin-off of the Shin Megami Tensei series of video games; the main difference between Digital Devil Saga and the main series is the focus on specific characters rather than summoning demons to fight alongside your party. The story to Digital Devil Saga is continued with its direct sequel Shin Megami Tensei: Digital Devil Saga 2.
Notable features of the game include the ability to shapeshift between demon and human forms in battle, and a return of the "press turn" battle system from Shin Megami Tensei III: Nocturne. A large difference between Nocturne and Digital Devil Saga is the ability to change equipped skills at will, instead of at level up. Unlike in Nocturne, unlearned skills are not lost forever, which allows for much greater character customization. The game features a mantra system where Macca gained after battle can be used to "download" new mantras at a saving terminal. Atma, gained by devouring enemies in battle, then allows the characters to Master these mantras, imparting new abilities.
Digital Devil Saga was released in 2004 in Japan, 2005 in North America, and 2006 in Europe. The band Etro Anime provided "Danger", the introductory song for the U.S. version of the game, and Houko Kuwashima provided "Pray", the introductory song for the Japanese and European version of the game.