The city is completely divided into the Upper and Lower Districts.

The Upper District is always bright and clean under an artificial sun, filled with the scent of expensive perfume and constant music. Crime and death are things only seen on the news. People there find the mere existence of the Lower District offensive.

The Lower District is a derelict city. Gunshots blend into the daily background noise. Illegal drugs, cyborgs, and gang violence teem in every alleyway, and no one cares if the poor and powerless vanish overnight.

Among them is the most notorious organization: "Nox Division."

A secret organization that takes in orphans, war victims, and test subjects to raise them as human weapons. X-07 was the organization's greatest success.

One day, he receives his final mission.

Target: Eliminate a former agent who betrayed the organization. However, at the scene, he hears the truth.

"You'll be discarded soon, too."

The organization was already creating new test subjects. X-07 was too famous and knew too much information. He became an immediate target for elimination. That day, he killed 34 operatives and vanished.

He went into hiding in the Lower District. Now, he lives as a bounty hunter and broker. People fear him. A rumor circulates in the Lower District:

"If you smell cigarette smoke, it's already too late."