"Hitsugi Tantei D&W" is a mystery and supernatural manga series that revolves around the enigmatic detective duo, D and W, who specialize in solving cases involving the dead. The narrative is set in a world where the boundary between life and death is blurred, and the protagonists possess unique abilities to interact with the deceased. D, the primary detective, is a reserved and analytical individual with a deep understanding of the occult, while W, his partner, is more impulsive and emotionally driven, often providing a contrasting perspective to D's calculated approach.

The story begins with the introduction of D and W as they take on a series of cases involving spirits, curses, and unresolved grievances tied to the dead. Each case is self-contained, yet interconnected through overarching themes of mortality, justice, and the lingering impact of the past on the present. The detectives' investigations often lead them to confront not only supernatural entities but also the darker aspects of human nature, such as guilt, revenge, and unresolved trauma. Their methods involve a combination of deductive reasoning, occult knowledge, and direct communication with spirits, making their approach to solving mysteries both unconventional and effective.

Key characters include D, whose mysterious past and connection to the supernatural world are gradually revealed throughout the series, and W, whose personal struggles and emotional depth add complexity to the partnership. Supporting characters, such as clients, victims, and antagonists, are intricately woven into the narrative, each contributing to the exploration of the series' central themes. The interplay between the living and the dead serves as a recurring motif, highlighting the consequences of actions and the importance of closure.

The manga's structure is episodic, with each chapter or arc focusing on a specific case, while also advancing the overarching plot and character development. The tone is consistently dark and atmospheric, with moments of tension and introspection balanced by the dynamic between the two protagonists. The series delves into moral ambiguity, often leaving readers to question the nature of justice and the ethics of the detectives' methods. Through its intricate storytelling and well-developed characters, "Hitsugi Tantei D&W" offers a compelling exploration of mystery, the supernatural, and the human condition.