"Dekin no Mogura" is a crime thriller anime centered around a mysterious figure known as Mogura, a master thief who specializes in infiltrating high-security facilities to steal valuable items. The narrative unfolds as Mogura, whose true identity remains concealed, is hired by a shadowy organization to carry out a series of increasingly complex heists. Each mission is meticulously planned, showcasing Mogura's unparalleled skills in deception, strategy, and adaptability. The series delves into the intricate details of these heists, emphasizing the tension and precision required to outsmart security systems and rival criminals.

The plot thickens as Mogura's actions attract the attention of law enforcement, particularly a determined detective named Kurosawa, who becomes obsessed with uncovering the thief's identity. Kurosawa's investigation reveals a web of corruption and conspiracy, suggesting that Mogura's heists are not merely for personal gain but are part of a larger, more sinister agenda. As the story progresses, the line between right and wrong blurs, with both Mogura and Kurosawa questioning their motives and the morality of their actions.

Key characters include Mogura, whose enigmatic persona and sharp intellect drive the narrative; Kurosawa, the relentless detective whose pursuit of justice becomes increasingly personal; and a cast of supporting figures, including members of the shadowy organization and various individuals affected by Mogura's heists. The series explores themes of trust, betrayal, and the consequences of one's choices, all set against the backdrop of high-stakes criminal activity. The interplay between Mogura and Kurosawa forms the core of the story, creating a dynamic cat-and-mouse game that keeps viewers engaged throughout the series.