In a futuristic, post-apocalyptic world, humanity is trying to rebuild in the utopian city of Olympus, governed by Bioroids, genetically engineered humans created to serve the greater needs and to ensure peace among humans. Deunan Knute, a young but talented female warrior, and her cyborg partner, Briareos Hecatonchires, are members of E.S.W.A.T., an elite counter-terrorism unit designed to maintain this fragile peace. The two are not just partners in the line of duty but are deeply connected on a personal level, with Briareos having been transformed into a cyborg after sustaining severe injuries, complicating their relationship amid their duty to society.

Their latest mission thrusts them into a complex conspiracy when they are tasked with investigating a series of terrorist attacks linked to a mysterious and dangerous technology that can control humans. This new threat challenges their abilities and their understanding of justice and peace in Olympus. As they delve deeper into their investigation, they encounter Tereus, a Bioroid who bears an uncanny resemblance to Briareos before his cyborg transformation, creating tension within the team. As they grapple with their personal conflicts, the trio must also confront the sinister force behind the escalating violence that threatens to tear apart the delicate balance of their world, pushing their dedication and morality to the limits.