Yuno Gasai lives a normal life as a first-year in high school. She gets along well with her parents and even has a small circle of friends. However, she cannot help but feel as if someone is missing from her life, someone so important to her that it was as if she had lived another life trying desperately to stay with them. After a class trip to the beach, Yuno returns home; but in the middle of the night, she receives strange messages from a voice only she can hear. The voice informs her of the person she is desperate to meet and that she must find him. Soon, she finds herself in a mysterious realm, her only goal being reunited with the person she cannot remember. Though obstacles stand in her way, Yuno will stop at nothing to meet her beloved once again. [Written by MAL Rewrite]

Humans live their lives driven by ambition and greed, prepared to kill their own kind with no hesitation. Since the beginning of humanity, wars have raged on throughout the human world, with the other races watching on. A victim of one war and orphaned, Ashleen was saved by the lord of the werewolves, Muzaka. Muzaka had abandoned his duties as lord and left the werewolf clan, travelling with Ashleen to secure her happiness. However, during his absence, members of Muzaka's species began orchestrating further wars on humans, disgusted by Muzaka's compassion. A secret and powerful organization established itself in the human realm, intending to manipulate Muzaka. When he is misinformed by the Union, Muzaka starts directing his rage toward the humans. Can his only friend, Cadis Etrama Di Raizel, the Noblesse, stop Muzuka's madness? Set 820 years before the events of Noblesse, Noblesse: Pamyeol-ui Sija depicts the tragic history of Muzaka, and how it led to the Noblesse's indefinite slumber.

Episodes released on DVDs bundled with the 14th, 16th, and 17th volumes of the Nisekoi manga.

Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons.