Crunchyroll describes it:
BROTHERHOOD FINAL FANTASY XV is a new anime series consisting of five standalone episodes. BROTHERHOOD delves into the extraordinary friendships between Crown Prince Noctis and his three comrades, setting the stage for the adventure players will set out upon in the action-packed RPG.
anime produced by A-1 Pictures and owned by Square Enix
(This review will not have spoilers. Even though the last episode was episode 5, it actually has 6 episodes; however, it was informed that episode 6 will be exclusive in the Ultimate Collector’s Edition. Square Enix also updated that episode 6 is not a full episode but it’s actually bonus scenes. This review will focus on the 5 episodes nevertheless.)