Final Fantasy XV: Episode Prompto
Top Critic Average
Publisher: Square Enix
Truthfully, I don't know that anyone was really asking for the untold story of Prompto; but now that we have it, I find that I like him a lot more than I did. And of course, more Aranea is always welcome. If you're not already sick of Final Fantasy XV, it's a very fun two hours
By the time Final Fantasy XV is fully finished, most of its mysteries and interludes will have been explained. It's up to you if you want to discover them individually or all at once with the eventual Game of the Year edition (which might come a full year after XV's November 2016 release, given that Episode Ignis isn't dropping until December). For me the main story juice has been worth the squeeze, but the DLC has not.
Final Fantasy XV: Episode Prompto Trailer (with subtitles)