Atlus

Brothers Shin & Jun Kanzato return to their hometown of Ayanagi City to reunite with their older sibling & police chief Ryo. Shin grows suspicious when Ryo, knee-deep in a grisly murder case with impossible victims, tells the two to turn back. This suspicion deepens when Shin develops a mysterious ability called "Persona", and finds himself under assault by those with the same power. Now Shin must uncover what exactly his brother is trying to protect him from. Who is the cause of the murders? And how does it relate to the incident 10 years ago that separated the brothers to begin with? Something sinister is afoot in Ayanagi City, and Shin is going to find out what... before it finds him first.

The countdown to extinction begins on Sunday with the arrival of the Septentriones, otherworldly invaders set on the eradication of mankind. Caught in the crossfire, Hibiki Kuze and his friends join in the war for humanity's survival by signing contracts with demons to become "Devil Summoners." Soon, their abilities attract the attention of JP's, an underground agency led by Yamato Houtsuin. Once recruited into JP's, Hibiki and his friends fight and bond alongside other ordinary citizens who are Devil Summoners. However, with each new day, another Septentrione appears to wreak havoc upon Japan. Even if many lives are lost in the process, before that night ends, the young summoners must defeat the invaders at all costs.

When in 2009 you move to Tatsumi Port Island after 10 years, as a new student for the Gekkoukan High School, you find out about strange events taking place there, as well as a group of students trying to take care of them.