Emotionless mediums used for surveillance through various elements like water or electricity.

The protagonist, Hei (the Black Reaper), is tasked by the Syndicate to retrieve Havoc before other agencies can reach her.

Various international intelligence agencies are desperate to capture Havoc to uncover the secrets of the Gates.

In this episode, a notorious and high-ranking Contractor named reappears after a long period of absence. Years prior, Havoc was involved in a massive incident in South America that led to the disappearance of the "Gate," and she is considered one of the most dangerous Contractors in history.

Individuals who gained powers but must pay a "remuneration" (a repetitive or strange task) every time they use their abilities.