The Noblesse Cadis Etrama di Raizel, known as Rai, is enrolled at Ye Ran High School by his caretaker Frankenstein so he can remain concealed from the Union—a shadowy group hunting for Rai"s blood. Rai begins his days as a pupil, acquainting himself with classmates and the rhythms of ordinary life. Yet this new existence is anything but tranquil; soon he must rescue friends who have been seized by the Union.
At the same time, M‑21—a former Union agent who turned rogue during Rai"s rescue—joins the school"s security team after an offer from its director, who is none other than Frankenstein. Though M‑21 appears a disciplined staff member on the surface, he is bound by past loyalties to the Union and the fallout of his betrayal.
Rai quickly learns the nuances of school life, from lunchroom gossip to after‑school clubs, all while keeping his extraordinary heritage under wraps. His classmates admire him for his calm demeanor, unaware that he is a living relic of ancient power.
Nobles Regis K. Landegre and Seira J. Loyard also enroll, probing the Noblesse. Their investigation threatens to expose Rai and attract the Union. While the Union hunts M‑21 for clues about missing agents, Rai must conceal his true identity and safeguard everyone he cares about. Despite danger, Rai stays steadfast, protecting friends and preserving school peace.
