"Hannin-kun, Nani Shiten no?" centers on a high school student named Shougo, who becomes entangled in a series of bizarre and often comedic situations due to his peculiar ability to attract criminals. Shougo possesses an uncanny knack for identifying wrongdoers, which inadvertently leads him to cross paths with a wide array of criminals, from petty thieves to more dangerous individuals. Despite his seemingly ordinary demeanor, Shougo’s life is anything but normal, as he frequently finds himself in the middle of criminal activities, often without intending to.

The narrative unfolds as Shougo’s unique talent catches the attention of law enforcement, particularly a detective named Kana, who begins to rely on him to solve cases. Kana is a sharp and determined investigator, though her methods are sometimes unorthodox. She recognizes Shougo’s potential and often drags him into her investigations, much to his chagrin. Their dynamic is a mix of professional collaboration and comedic tension, as Shougo’s reluctance to get involved clashes with Kana’s relentless pursuit of justice.

Throughout the series, Shougo encounters a variety of criminals, each with their own quirks and motivations. These interactions often lead to humorous and unpredictable scenarios, as Shougo’s ability to sense wrongdoing frequently puts him in awkward or dangerous positions. Despite his aversion to trouble, Shougo’s innate sense of justice and his growing bond with Kana compel him to assist in solving cases, even when it means putting himself at risk.

The manga balances crime-solving with comedic elements, creating a lighthearted yet engaging narrative. Shougo’s character evolves as he becomes more accustomed to his role in aiding Kana, though he remains a reluctant participant in her investigations. The series explores themes of justice, morality, and the complexities of human behavior, all while maintaining a humorous tone. The interplay between Shougo and Kana, along with the eccentric cast of criminals they encounter, drives the story forward, offering a blend of mystery, comedy, and character development.