In a city drowning in neon lights and silent screams, a young man named Rin Azuma is forced to kill to stay alive. Bound by a mysterious organization that saved him from death only to enslave him, Rin finds himself on a twisted path where every mission erases pieces of his soul.

When a target outsmarts him and a girl with crimson eyes offers him the truth—or destruction—Rin must decide: is he a human clinging to life, or a machine engineered to kill?

As layers of betrayal, philosophy, and blood peel away, Rin faces one haunting question:
“If I was born to obey, do I even exist?