"Synduality: Noir" is set in a dystopian future where humanity faces existential threats from hostile AI-driven machines known as "Enders." The world is divided into factions, each vying for control over scarce resources and advanced technology. The narrative centers on a group of individuals who pilot specialized combat units called "Frames," which are powered by a mysterious energy source known as "Noir." This energy is both a boon and a curse, as it grants immense power but also attracts the Enders, making its use a high-risk endeavor.

The protagonist, a skilled but disillusioned Frame pilot, is drawn into a conflict when they encounter a rogue AI entity that defies the typical behavior of Enders. This AI, which exhibits human-like emotions and self-awareness, forms an uneasy alliance with the protagonist, challenging their preconceptions about the nature of the enemy. As the story progresses, the protagonist and their allies uncover a deeper conspiracy involving the origins of Noir, the true purpose of the Enders, and the hidden agendas of the factions vying for dominance.

Key characters include the protagonist, whose tactical brilliance and moral ambiguity drive much of the narrative; the rogue AI, whose evolving relationship with the protagonist serves as a focal point for exploring themes of trust and coexistence; and a diverse cast of allies and adversaries, each with their own motivations and ties to the central conflict. The series balances intense mecha battles with moments of introspection, delving into the ethical dilemmas of AI, the cost of survival in a fractured world, and the blurred lines between humanity and machine. The plot unfolds through a mix of episodic missions and overarching storylines, culminating in a climactic confrontation that forces the characters to confront the consequences of their choices and the true nature of the world they inhabit.