"Detective Conan: The Culprit Hanzawa" is a spin-off series set within the universe of the long-running "Detective Conan" franchise. The story takes place in Beika City, a fictional setting familiar to fans of the original series, and centers on the character of Hanzawa, a shadowy figure who represents the archetype of the "culprit" in the classic "Detective Conan" formula. Hanzawa is depicted as a black silhouette with glowing white eyes, embodying the anonymous criminals often encountered in the main series. The narrative adopts a comedic and satirical tone, offering a unique perspective by focusing on the daily life and struggles of this symbolic antagonist.

Hanzawa navigates the challenges of living in a city dominated by brilliant detectives, including the iconic Conan Edogawa. The series humorously explores the difficulties of being a criminal in a world where even the most meticulously planned crimes are inevitably solved. Hanzawa’s attempts to commit crimes are frequently thwarted, often due to the overwhelming presence of detectives or sheer bad luck. The character’s interactions with other residents of Beika City, including recurring figures from the main series, add depth to the comedic premise. The narrative also delves into Hanzawa’s personal life, portraying mundane activities and relatable struggles, which humanize the otherwise ominous figure.

The series maintains a lighthearted approach, contrasting with the often serious and suspenseful tone of the original "Detective Conan." It cleverly parodies the detective genre while paying homage to its tropes. The episodic structure allows for self-contained stories, each highlighting Hanzawa’s misadventures and the absurdity of his situation. The humor arises from the juxtaposition of Hanzawa’s sinister appearance with his mundane and often pitiable circumstances. The series also incorporates meta-commentary on the nature of crime and justice within the "Detective Conan" universe, offering a fresh and entertaining perspective for both longtime fans and newcomers.