Order to watch the Danganronpa series? Is there a "Danganronpa 2"? This season there are 2 simultaneous Danganronpa shows, both of which are prefaced with "Danganronpa 3".  The first series in the franchise is "Danganronpa: Kibou no Gakuen to Zetsubou no Koukousei".

I'm not clear on if there is a second series anywhere, or if the number 3 was just added to the names of both the new series.  

Wikipedia says  


  A second anime series, titled Danganronpa 3: The End of Hope's Peak High School, began airing in July 2016. The series is split into two simultaneously airing parts; Side: Future, which serves as a conclusion to the "Hope's Peak Academy" storyline, and Side: Despair, which serves as a prequel to Danganronpa 2


which is clear as mud.  I am unable to find information on "Danganronpa 2", though I would expect one to be a prequel to the first series, and the other to maybe be a side story or a post story.


What order should I watch Danganronpa in?
For the current series, does it matter which episode I watch first from each of the simultaneous ones (the "Future Arc" started airing before the "Despair Arc")?
Does the Wiki page confuse "Danganronpa 2" with the manga/LN material?
I think what is being missed here is the second game in the series, Danganronpa 2: Goodbye Despair.

From the Wikipedia article:


  It is the second installment in the Danganronpa series, and a direct sequel to the 2010 game Danganronpa: Trigger Happy Havoc.


It's the sequel to Danganronpa 1, adding to the DGR universe beyond the events of Trigger Happy Havoc, complete with a whole new set of characters, scenery, and more.

Danganronpa: The Animation is an anime adaptation of DGR1, AKA Trigger Happy Havoc, AKA THH. THH is the basis of the entire DGR story/franchise; it is the first game, but not the first event of DGR chronologically. Essentially all other canon media in the DGR universe builds upon the events of THH, so you'll want to start here. Either the show or the game will suffice, though I recommend the game.

DGR2's story is critical to both sides of the DGR3 animes. As per the wiki article, Despair


  tells the backstory of Hope's Peak Academy's 77th Class


which is the same class featured in DGR2. Even though 3/Despair happens chronologically before DGR2, I recommend playing DGR2 before watching 3/Despair. DGR2 tells the story of the 77th class, which is then given more context/backstory in 3/Despair. DGR2 does not have an anime adaptation, but it apparently has a manga. 

The Future and Despair arcs aired simultaneously in an alternating fashion, starting with Future. Chronologically, Despair happens entirely before Future, but the intended watching order is actually the order in which the episodes are released; so, also in an alternating fashion starting with Future (source: wiki.) In other words, Future ep. 1, then Despair ep. 1, then Future ep. 2, then Despair ep. 2, so on and so forth.



So, to hopefully answer your questions:


All Series Watch Order:


DGR1/THH/Danganronpa: The Animation
DGR2: Goodbye Despair (game or manga)
DGR Ultra Despair Girls (game)


   A few characters from UDG appear in Future, so it may benefit you to play this first, but it's not a dealbreaker like not playing DGR2 is.

Alternate watching DGR3/Future and DGR3/Despair episodes, i.e. F1 -> D1 -> F2 -> D2... etc.
DGR3/Hope
Danganronpa V3: Killing Harmony (game)


   IMO, V3's only strict prerequisite is DGR1 to get the full picture, but I recommend experiencing the whole series to be safe, if you can.




The DGR subreddit also has a good FAQ/writeup on this topic, including Supplementary Material.


DGR3 (Anime) Series Watch Order:


Alternate watching Future and Despair episodes, starting with Future.


A Note Regarding DGRv3:


The branding can be slightly confusing between Danganronpa 3 and Danganronpa V3. Danganronpa V3: Killing Harmony is the third installment of the game series (and features a brand new cast separate from DGR1/2), and Danganronpa 3, as discussed above, is the anime split into two parts (Despair/Hope) and the last episode, Hope.