"Tamashii Rettsha" is a manga series that blends elements of supernatural mystery and psychological drama. The narrative centers around a young man named Shou, who possesses the unique ability to see the "soul flames" of people, which represent their life force and emotional state. These flames vary in color and intensity, reflecting the individual's inner turmoil, desires, or impending fate. Shou's ability isolates him from others, as he struggles to understand the significance of what he sees and the burden it places on him.

The story takes a dramatic turn when Shou encounters a mysterious train known as the "Tamashii Rettsha" (Soul Train). This train appears only to those who are on the brink of death or experiencing profound existential crises. The train's passengers are individuals whose soul flames are fading, signaling their imminent demise or deep despair. Shou is drawn into the train's enigmatic world, where he meets its conductor, a stoic and enigmatic figure who guides the passengers to their final destinations. The conductor reveals that Shou's ability is tied to the train's purpose, and he is offered a role in assisting the passengers as they confront their unresolved emotions and regrets.

As Shou becomes more involved with the train and its passengers, he encounters a diverse cast of characters, each with their own tragic or poignant backstories. These interactions force Shou to grapple with his own fears, guilt, and the nature of life and death. The series explores themes of redemption, acceptance, and the human condition, often delving into the emotional and psychological struggles of its characters. The train serves as a metaphor for the journey of the soul, with each passenger's story contributing to the overarching narrative of closure and transformation.

The manga maintains a somber and reflective tone, with a focus on character development and the exploration of moral and existential questions. Shou's growth is central to the story, as he learns to navigate his abilities and the responsibilities they entail. The series balances episodic storytelling with an overarching plot, gradually revealing the mysteries of the Tamashii Rettsha and its connection to Shou's past. Through its intricate narrative and emotional depth, "Tamashii Rettsha" offers a compelling exploration of life, death, and the human soul.