In seven days, Tokyo will fall. The entire city has been locked down. No one enters, and no one leaves. Demons have invaded the city, attacking innocent people who have no means of fighting back. Inside the lockdown, fear and chaos reign. You are inside the lockdown. You will forge contracts with demons who will fight by your side. You will make decisions that will mean life for some and death for others. But what about your own life? Will you survive? Seven days remain. The clock is ticking.