Devil Survivor

It was summer in Tokyo when Minegishi Kazuya, Kihara Atsuro and Tanikawa Yuzu have been given modified electronic device called COMPs by his older cousin Naoya. As they are exploring their purpose of having the COMPS, an outbreak of demons occurs within Tokyo and a large area of the city is quarantined by the Japanese Ground Self-Defense Forces, denying power, communications, and food to those who trapped within. The chaotic situation gives rise to vigilantes who take it upon themselves to fight the demons or even prey on weaker humans. Kazuya and his friends discover their COMPs allow them to summon helpful demons to fight the aggressive ones, allowing them to survive the attacks. He also found out that he has the ability to see a person's "death clock", representing how many days a person will have left to live. While he uses it to help himself and his friends to change their own fate, he realizes that everyone within the quarantine will die within seven days.