"Dear NOMAN" is a manga series that explores themes of identity, memory, and human connection within a dystopian framework. The narrative is set in a future where humanity has been decimated by a mysterious phenomenon known as the "NOMAN Syndrome," which causes individuals to lose their memories and sense of self, effectively erasing their identities. Those afflicted are referred to as "NOMAN," and they wander aimlessly, devoid of purpose or recognition.

The protagonist, a young man named Haruto, lives in a world where the surviving population has been forced to adapt to the constant threat of NOMAN Syndrome. Haruto works as a "Memory Hunter," a specialized role tasked with retrieving fragments of lost memories from NOMAN individuals in the hope of restoring their identities. These memory fragments are stored in devices called "Cores," which hold the key to understanding the syndrome and potentially reversing its effects.

Haruto's journey begins when he encounters a mysterious girl named Aya, who appears to be immune to NOMAN Syndrome. Aya possesses a unique ability to retain her memories and even access the memories of others, making her a target for various factions vying to control or exploit her power. As Haruto and Aya form an uneasy alliance, they uncover deeper truths about the origins of NOMAN Syndrome and the shadowy organization behind its spread.

The plot unfolds through a series of interconnected arcs, each revealing more about the world and its inhabitants. Key characters include Dr. Kurosawa, a scientist dedicated to finding a cure for NOMAN Syndrome, and Rei, a former Memory Hunter who harbors a personal vendetta against the organization responsible for the crisis. The narrative delves into the ethical dilemmas surrounding memory manipulation, the fragility of human identity, and the lengths to which individuals will go to preserve their sense of self.

As Haruto and Aya navigate this fractured world, they confront not only external threats but also their own internal struggles. Haruto grapples with the weight of his responsibilities and the moral ambiguity of his actions, while Aya struggles to reconcile her unique abilities with the burden they place on her. Their evolving relationship serves as a central emotional anchor, highlighting the importance of human connection in a world where identity is constantly under threat.

The story is marked by its intricate world-building, blending elements of science fiction and psychological drama. The pacing alternates between intense action sequences and introspective moments, creating a balanced narrative that keeps readers engaged. Themes of loss, resilience, and the search for meaning are woven throughout, offering a thought-provoking exploration of what it means to be human in the face of existential uncertainty.