"Noblesse" centers on Cadis Etrama di Raizel, a powerful and enigmatic noble who awakens after an 820-year slumber. Upon awakening, Raizel adapts to modern society with the help of his loyal servant, Frankenstein, who has been living among humans for centuries. Raizel enrolls in Ye Ran High School, where he befriends students Shinwoo, Ik-Han, and Yuna, blending into everyday life while concealing his true nature. However, his peaceful existence is disrupted when mysterious organizations and powerful adversaries begin targeting him and those around him.

The narrative explores Raizel's origins as a Noblesse, a noble protector tasked with maintaining balance between humans and other supernatural beings. His immense power, derived from his blood-based abilities, makes him a target for the Union, a secretive organization conducting unethical experiments to create superhuman soldiers. Frankenstein, a former Union scientist turned Raizel's devoted servant, plays a pivotal role in protecting Raizel and his friends while confronting his own dark past.

As the story progresses, Raizel and his allies face escalating threats from the Union and its genetically enhanced agents, including the ruthless M-21 and the enigmatic M-24. The series delves into themes of loyalty, sacrifice, and the moral complexities of wielding power. Raizel's interactions with his human friends highlight his growing attachment to humanity, even as he struggles with the consequences of his immense abilities and the responsibilities of his role as a Noblesse.

The plot intensifies with the introduction of other Nobles, such as Ragar Kertia and Gejutel K. Landegre, who bring their own agendas and conflicts into the narrative. The Union's experiments and their pursuit of Raizel's power lead to large-scale battles, testing the limits of Raizel's strength and resolve. Throughout the series, the relationships between Raizel, Frankenstein, and their allies are central to the story, emphasizing trust and camaraderie in the face of overwhelming odds.

"Noblesse" combines action, supernatural elements, and character-driven drama, presenting a tale of ancient powers clashing with modern ambitions. The series balances its high-stakes conflicts with moments of humor and humanity, creating a narrative that explores the intersection of duty, friendship, and the struggle to protect what matters most.