"In One's Last Moment" is a manga series that explores themes of mortality, human connection, and the fleeting nature of life. The narrative centers on a young man named Haruto, who, after a near-death experience, gains the ability to perceive the final moments of those around him. This newfound ability manifests as brief, vivid visions that reveal the circumstances and emotions tied to a person's impending death. Haruto struggles with the weight of this power, torn between intervening to alter fate and accepting the inevitability of death.

The story unfolds in a contemporary urban setting, where Haruto encounters a diverse array of individuals, each with their own struggles and stories. Among them is Aoi, a nurse who becomes a pivotal figure in Haruto's life. Aoi is compassionate and grounded, serving as a counterbalance to Haruto's internal turmoil. Their relationship evolves as they navigate the ethical dilemmas posed by Haruto's ability, often finding themselves at odds over whether to interfere with the natural course of life and death.

Another key character is Riku, a childhood friend of Haruto who harbors a deep-seated resentment toward him. Riku's arc delves into themes of jealousy, regret, and the complexities of human relationships. As the story progresses, Riku's own mortality becomes a focal point, forcing Haruto to confront the limits of his power and the emotional toll it takes on him.

The plot is structured around episodic encounters with individuals whose final moments Haruto witnesses. These vignettes serve to highlight the fragility of life and the interconnectedness of human experiences. Each encounter challenges Haruto's perspective, pushing him to grapple with questions of morality, free will, and the meaning of existence. The series maintains a somber yet introspective tone, punctuated by moments of hope and resilience.

As the narrative advances, Haruto's visions grow more intense and frequent, leading to a climactic confrontation with his own mortality. The series culminates in a poignant exploration of acceptance, as Haruto comes to terms with the transient nature of life and the importance of cherishing the present. The ending leaves room for interpretation, emphasizing the cyclical nature of existence and the enduring impact of human connections.