Shin Megami Tensei: Devil Survivor

Shin Megami Tensei: Devil Survivor is a 2009 tactical role-playing game developed and published by Atlus for the Nintendo DS. It is a spin-off within the wider Megami Tensei series. An expanded version subtitled Overclocked was released on the Nintendo 3DS in Japan and North America by Atlus in 2011, and in Europe by Ghostlight in 2013. Following a group of teenagers in Tokyo who are trapped inside a government lockdown following an invasion of demons, the gameplay is divided between story events tied to an in-game clock, and tactical grid-based combat with a turn-based battle system. Which events and battles are completed can unlock different endings.