"Freesia" is a psychological and dystopian manga set in a near-future Japan where society has undergone significant legal and moral changes. The government has implemented a system called the "Retaliation Permission Law," which allows individuals to seek legal vengeance against those who have wronged them. This law has led to widespread violence and a breakdown of traditional societal norms, creating a chaotic and unstable environment.

The protagonist, Hiroshi Kano, is a former soldier suffering from severe psychological trauma after his experiences in war. He struggles with hallucinations and fragmented memories, which blur the line between reality and his distorted perceptions. Kano becomes involved in the Retaliation Permission Law when he is hired as an agent to carry out acts of vengeance on behalf of clients. His job requires him to confront and kill individuals who have been legally targeted, often leading to morally ambiguous and emotionally taxing situations.

Kano's personal life is equally tumultuous. He lives with his wife, who is unaware of his violent profession, and their relationship is strained by his emotional detachment and erratic behavior. As the story progresses, Kano's mental state deteriorates further, and his hallucinations become more vivid and intrusive. These hallucinations often involve his deceased comrades from the war, who haunt him with guilt and unresolved trauma.

The narrative explores themes of justice, morality, and the psychological impact of violence. Kano's journey is marked by a series of violent encounters and introspective moments, revealing the complexities of his character and the world he inhabits. The Retaliation Permission Law serves as a backdrop for examining the consequences of institutionalized vengeance and the erosion of societal values.

Supporting characters include Kano's colleagues, who also navigate the morally ambiguous world of legalized vengeance, and his clients, who seek retribution for personal grievances. The interactions between these characters highlight the diverse motivations and ethical dilemmas faced by individuals in this dystopian society.

"Freesia" is characterized by its dark and gritty tone, with a focus on psychological depth and moral ambiguity. The story delves into the psyche of its protagonist and the societal implications of its central premise, offering a thought-provoking exploration of human nature and the consequences of violence.