You are an almost retired peacekeeper on planet Earth. Hired by the U.A.C., you are monitoring special quarantined zones called Bloodlines. They contain all remaining demons who came through the portal from Hell.
Demons are allowed to live on Earth after the portal to Hell was opened by the UAC. Demons shall not kill the living. Demons shall not disturb the living. Demons shall obey nature's will at all times.
You are an almost retired UAC Peacekeeper, monitoring the designated areas where demons have their established living. One sip of your coffee, on a late night shift, and you notice a red alert on your monitor;
"RED ALERT! Hellish quarantine zone has been breached. RED ALERT! Hellish quarantine zone has been breached. RED ALERT! Hellish quarantine zone has been breached."
You sprint towards the headquarters to investigate...