A story set alongside the video game Final Fantasy XV, starring one of its main characters, Noctis, and his friends. The extended cut (released with the SteelBook Edition of Kingsglaive: Final Fantasy XV) includes the five episodes and exclusive scenes.

Similar to the way Brotherhood: Final Fantasy XV detailed the backgrounds of the four main heroes of Final Fantasy XV, Episode Ardyn – Prologue details the background of Ardyn from 2,000 years ago in Eos's history when he used to work as a healer.