Shin Megami Tensei: Devil Survivor 2 (デビルサバイバー２ THE ANIMATION / ) is a role-playing game in the Megami Tensei series developed by Atlus for the Nintendo DS. It tells the story of Japanese high school students who enter a pact, enabling them to summon demons and fight mysterious creatures invading and destroying the country. The game also received two manga series, as well as a television anime adaptation by Studio Bridge, Devil Survivor 2: The Animation, which aired in Japan between April and June 2013.
Mysterious invaders called the Septentriones arrive in Japan and begin attacking the country on a Sunday. To fight back, the heroes in Devil Survivor 2 signed a pact with the devil to become the Thirteen Devil Messengers. The Septentriones show up at least once a day and you have a time limit of seven days to defeat them.