Daijirō Funaki operates as a Gaikan, a specialized enforcer clad in an advanced exosuit that boosts his physical prowess to maintain order within the lawless outskirts of a starkly divided futuristic city. His mandate focuses on suppressing crime and rebellion among the marginalized underclass, enforcing the will of a regime that exploits disadvantaged populations for labor and resources while reserving technological progress for the privileged elite.

His path takes a decisive turn upon encountering Aya, a fugitive linked to the revolutionary group "Shadows of Dawn," which aims to overthrow the oppressive government. Aya holds critical intelligence exposing a state conspiracy to develop a devastating weapon, compelling Funaki to choose between his sworn duty and his burgeoning sympathy for the revolutionaries' struggle. This meeting propels him into the heart of the broader conflict, where he uncovers hidden truths about the city's leadership and the Gaikan program's genuine purpose.

Throughout this involvement, Funaki faces intense internal conflict, wrestling with the moral complexities of his role as he interacts with Aya and other insurgents. His worldview fractures under revelations of systemic corruption and exploitation, forcing him to confront profound questions of loyalty, justice, and the ethical price of upholding order versus aiding rebellion. His evolution centers on navigating shifting alliances, reckoning with betrayals, and reconciling his enforcement obligations with his awakening conscience. The narrative charts his journey through kinetic action and quiet introspection, depicting his struggle to forge his own path amid escalating societal strife and obscured realities.