It is a bit ambiguous in this case.
The anime finished after the manga:
Anime finished: December 31, 2020
Manga finished: January 07, 2019
... But we could not confirm the source content in MangaUpdates.
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Anime - Prequel
Release date: December 04, 2015
Anime - Prequel
Release date: February 04, 2016
Anime - Base
Release date: October 08, 2020
Noblesse follows Cadis Etrama di Raizel, a powerful being called a Noblesse, who awakens after a long slumber. His loyal servant, Frankenstein, enrolls him in a high school to help him adjust to the modern world and stay hidden from a dangerous organization known as the Union.
Rai, as he is now known, tries to live a normal life as a student, befriending his classmates and learning about human customs. However, the Union's presence threatens his newfound peace, and he must protect his friends from their sinister plots.
Adding to the complexity, a former Union agent named M-21 seeks refuge at the school and works with Frankenstein. Two other Nobles, Regis and Seira, also arrive, their mission to investigate the Noblesse himself. All while Rai must keep his true identity a secret.
The story revolves around Rai navigating his new life, battling the Union's threats, and safeguarding those around him, all while concealing his immense power and true nature.