"Neji" is a manga series that blends elements of supernatural action, psychological drama, and dark fantasy. The narrative centers around Neji, a young man who possesses a unique ability to see and interact with "threads of fate," which manifest as glowing strands connecting individuals to their destinies. These threads are invisible to most people, but Neji can manipulate them, altering the course of events and influencing the lives of those around him. This power, however, comes with significant consequences, as tampering with fate often leads to unforeseen and catastrophic outcomes.

The story begins with Neji living a relatively isolated life, burdened by the weight of his ability and the moral dilemmas it presents. His existence takes a dramatic turn when he encounters a mysterious girl named Sana, who is pursued by a shadowy organization known as the "Weavers." The Weavers are a clandestine group that seeks to control the threads of fate for their own purposes, often at the expense of innocent lives. Sana, it is revealed, is a "Threadless," a rare individual with no visible threads of fate, making her existence a anomaly that threatens the Weavers' plans.

As Neji becomes entangled with Sana and the Weavers, he is forced to confront his own past and the origins of his power. Flashbacks reveal that Neji's ability was awakened during a traumatic event in his childhood, which also resulted in the death of someone close to him. This event left him with a deep sense of guilt and a reluctance to use his powers, fearing the potential harm they might cause. However, as the conflict with the Weavers escalates, Neji must grapple with his inner turmoil and decide whether to embrace his abilities to protect those he cares about.

The series explores themes of free will versus determinism, as Neji's power to alter fate raises questions about the nature of destiny and the ethical implications of interfering with it. The Weavers, who believe in a rigid, predetermined order, serve as a foil to Neji's more fluid and empathetic approach to the threads of fate. Their leader, a enigmatic figure known only as the "Loom Master," is particularly fixated on Sana, viewing her as a key to unlocking ultimate control over fate itself.

Throughout the narrative, Neji forms alliances with other individuals who possess unique abilities related to the threads of fate, including a rogue Weaver named Kaito, who has his own reasons for opposing the organization. Together, they navigate a world where the boundaries between reality and destiny are increasingly blurred, facing off against the Weavers' agents and uncovering the deeper mysteries surrounding the threads of fate.

The manga is characterized by its intricate plot, which weaves together elements of mystery, action, and philosophical inquiry. The characters are complex, with their motivations and backstories gradually revealed over the course of the series. The tension between Neji's desire to protect others and the potential consequences of his actions drives much of the narrative, creating a compelling exploration of the human condition and the nature of choice.