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.
Read more at http://myanimelist.net/anime/16512/Devil_Survivor_2_The_Animation#RrJKl5SCCeJq442A.99
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