"Master Keaton Remaster" is a manga series that centers on Taichi Hiraga-Keaton, a half-Japanese, half-British insurance investigator with a multifaceted background. Keaton is a former SAS soldier, an archaeology scholar, and a survival expert, which equips him with a unique skill set for solving complex cases. The narrative unfolds through episodic adventures, each presenting a self-contained story that showcases Keaton's intellect, resourcefulness, and moral compass.

The series is set primarily in Europe during the late 20th century, with Keaton traveling across various countries to investigate insurance claims, often uncovering deeper mysteries or conspiracies. His investigations frequently intersect with historical, cultural, and political elements, blending action, mystery, and drama. Keaton's cases range from uncovering art forgeries and solving murders to thwarting international espionage and rescuing hostages. His ability to navigate dangerous situations with a combination of tactical expertise and academic knowledge is a recurring theme.

Keaton's personal life is also explored, particularly his relationships with his estranged wife, Yuriko, and their daughter, Yuriko. These interactions provide insight into his character, revealing a man torn between his duty to his family and his passion for adventure and justice. The series occasionally delves into Keaton's past, including his time in the SAS and his academic pursuits, adding depth to his motivations and worldview.

Supporting characters include colleagues, clients, and adversaries who contribute to the series' diverse narrative landscape. Notable figures include Keaton's father, Takaaki Hiraga, a renowned zoologist whose eccentric personality contrasts with Keaton's pragmatic demeanor, and various individuals from Keaton's military and academic circles who reappear throughout the series.

"Master Keaton Remaster" combines elements of detective fiction, historical intrigue, and action-adventure, offering a rich tapestry of stories that highlight the protagonist's versatility and humanity. The episodic structure allows for a wide range of themes and settings, making each chapter a distinct yet cohesive part of Keaton's journey.