Shin Megami Tensei: Devil Survivor

Tokyo is completely sealed off, the government's swift, cold-blooded response to a surprise demon invasion. Trapped in the sprawling metropolis, the city's helpless population is forced to fight each other to survive. A mysterious piece of technology, the COMP, falls into the hands of you and your fellow players. With this device you can make contracts and force demons to serve you in the fight against the otherworldly creatures. There are also others with COMPs, called demon tamers, who use the demons for their own desires - be it justice, peace or power - in the chaos that was once downtown Tokyo. Where did the demons come from? Why did they appear? Who created the COMPs and what is their purpose? These questions must be answered soon, because if you can't solve the mystery, much more is at stake than your own life.